String.Split Método

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public string[] Split (string? separator, int count, StringSplitOptions options = System.StringSplitOptions.None);

public string[] Split (string separator, int count, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : string * int * StringSplitOptions -> string[]

Public Function Split (separator As String, count As Integer, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

Parâmetros

Retornos

Uma matriz que contém no máximo count subcadeias de caracteres dessa instância delimitadas por separator.

Comentários

Se a cadeia de caracteres já tiver sido dividida count - 1 vezes, mas o final da cadeia de caracteres não tiver sido atingido, a última cadeia de caracteres na matriz retornada conterá a subcadeia de caracteres à direita restante desta instância, intocada.

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public:
 cli::array <System::String ^> ^ Split(cli::array <char> ^ separator, int count, StringSplitOptions options);

public string[] Split (char[] separator, int count, StringSplitOptions options);

public string[] Split (char[]? separator, int count, StringSplitOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split (char[] separator, int count, StringSplitOptions options);

member this.Split : char[] * int * StringSplitOptions -> string[]

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.Split : char[] * int * StringSplitOptions -> string[]

Public Function Split (separator As Char(), count As Integer, options As StringSplitOptions) As String()

Parâmetros

Retornos

Uma matriz que contém as subcadeias de caracteres nesta cadeia de caracteres delimitadas por um ou mais caracteres em separator. Para obter mais informações, consulte a seção Comentários.

Atributos

ComVisibleAttribute

Exceções

Exemplos

O exemplo a seguir usa a enumeração StringSplitOptions para incluir ou excluir subcadeias de caracteres geradas pelo método Split.

// This example demonstrates the String.Split(Char[], Boolean) and 
//                               String.Split(Char[], Int32, Boolean) methods
using namespace System;
void Show( array<String^>^entries )
{
   Console::WriteLine( "The return value contains these {0} elements:", entries->Length );
   System::Collections::IEnumerator^ myEnum = entries->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ entry = safe_cast<String^>(myEnum->Current);
      Console::Write( "<{0}>", entry );
   }

   Console::Write( "{0}{0}", Environment::NewLine );
}

int main()
{
   String^ s = ",one,,,two,,,,,three,,";
   array<Char>^sep = gcnew array<Char>{
      ','
   };
   array<String^>^result;
   
   //
   Console::WriteLine( "The original string is \"{0}\".", s );
   Console::WriteLine( "The separation character is '{0}'.", sep[ 0 ] );
   Console::WriteLine();
   
   //
   Console::WriteLine( "Split the string and return all elements:" );
   result = s->Split( sep, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return all non-empty elements:" );
   result = s->Split( sep, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 elements:" );
   result = s->Split( sep, 2, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 non-empty elements:" );
   result = s->Split( sep, 2, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
}

/*
This example produces the following results:

The original string is ",one,,,two,,,,,three,,".
The separation character is ','.

Split the string and return all elements:
The return value contains these 12 elements:
<><one><><><two><><><><><three><><>

Split the string and return all non-empty elements:
The return value contains these 3 elements:
<one><two><three>

Split the string and return 2 elements:
The return value contains these 2 elements:
<><one,,,two,,,,,three,,>

Split the string and return 2 non-empty elements:
The return value contains these 2 elements:
<one><,,two,,,,,three,,>

*/

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Example 1: Split a string delimited by characters
Console.WriteLine("1) Split a string delimited by characters:\n");

string s1 = ",ONE,, TWO,, , THREE,,";
char[] charSeparators = new char[] { ',' };
string[] result;

Console.WriteLine($"The original string is: \"{s1}\".");
Console.WriteLine($"The delimiter character is: '{charSeparators[0]}'.\n");

// Split the string and return all elements
Console.WriteLine("1a) Return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("1b) Return all elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("1c) Return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("1e) Split into only two elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1f) Split into only two elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("1g) Split into only two non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Example 2: Split a string delimited by another string
Console.WriteLine("2) Split a string delimited by another string:\n");

string s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  ";
string[] stringSeparators = new string[] { "[stop]" };

Console.WriteLine($"The original string is: \"{s2}\".");
Console.WriteLine($"The delimiter string is: \"{stringSeparators[0]}\".\n");

// Split the string and return all elements
Console.WriteLine("2a) Return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("2b) Return all elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("2c) Return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("2e) Split into only two elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2f) Split into only two elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("2g) Split into only two non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Display the array of separated strings using a local function
void Show(string[] entries)
{
    Console.WriteLine($"The return value contains these {entries.Length} elements:");
    foreach (string entry in entries)
    {
        Console.Write($"<{entry}>");
    }
    Console.Write("\n\n");
}

/*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*/

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Display the array of separated strings using a local function
let show  (entries: string[]) =
    printfn $"The return value contains these {entries.Length} elements:"
    for entry in entries do
        printf $"<{entry}>"
    printf "\n\n"

// Example 1: Split a string delimited by characters
printfn "1) Split a string delimited by characters:\n"

let s1 = ",ONE,, TWO,, , THREE,,"
let charSeparators = [| ',' |]

printfn $"The original string is: \"{s1}\"."
printfn $"The delimiter character is: '{charSeparators[0]}'.\n"

// Split the string and return all elements
printfn "1a) Return all elements:"
let result = s1.Split(charSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "1b) Return all elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "1c) Return all non-empty elements:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "1d) Return all non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "1e) Split into only two elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "1f) Split into only two elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "1g) Split into only two non-empty elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "1h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Example 2: Split a string delimited by another string
printfn "2) Split a string delimited by another string:\n"

let s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  "
let stringSeparators = [| "[stop]" |]

printfn $"The original string is: \"{s2}\"."
printfn $"The delimiter string is: \"{stringSeparators[0]}\".\n"

// Split the string and return all elements
printfn "2a) Return all elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "2b) Return all elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "2c) Return all non-empty elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "2d) Return all non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "2e) Split into only two elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "2f) Split into only two elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "2g) Split into only two non-empty elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "2h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result

(*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*)

Public Shared Sub StringSplitOptionsExamples()
    ' This example demonstrates the String.Split() methods that use
    ' the StringSplitOptions enumeration.

    ' Example 1: Split a string delimited by characters
    Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)

    Dim s1 As String = ",ONE,, TWO,, , THREE,,"
    Dim charSeparators() As Char = {","c}
    Dim result() As String

    Console.WriteLine("The original string is: ""{0}"".", s1)
    Console.WriteLine("The delimiter character is: '{0}'." & vbCrLf, charSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("1a) Return all elements:")
    result = s1.Split(charSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("1b) Return all elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("1c) Return all non-empty elements:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("1e) Split into only two elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1f) Split into only two elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("1g) Split into only two non-empty elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Example 2: Split a string delimited by another string
    Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)

    Dim s2 As String = "[stop]" +
                "ONE[stop] [stop]" +
                "TWO  [stop][stop]  [stop]" +
                "THREE[stop][stop]  "
    Dim stringSeparators() As String = {"[stop]"}


    Console.WriteLine("The original string is: ""{0}"".", s2)
    Console.WriteLine("The delimiter string is: ""{0}""." & vbCrLf, stringSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("2a) Return all elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("2b) Return all elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("2c) Return all non-empty elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("2e) Split into only two elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2f) Split into only two elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("2g) Split into only two non-empty elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)

End Sub

' Display the array of separated strings.
Public Shared Sub Show(ByVal entries() As String)
    Console.WriteLine("The return value contains these {0} elements:", entries.Length)
    Dim entry As String
    For Each entry In entries
        Console.Write("<{0}>", entry)
    Next entry
    Console.Write(vbCrLf & vbCrLf)

End Sub

'This example produces the following results:
'
' 1) Split a string delimited by characters:
'
' The original string is: ",ONE,, TWO,, , THREE,,".
' The delimiter character is: ','.
'
' 1a) Return all elements:
' The return value contains these 9 elements:
' <><ONE><>< TWO><>< >< THREE><><>
'
' 1b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 1c) Return all non-empty elements:
' The return value contains these 4 elements:
' <ONE>< TWO>< >< THREE>
'
' 1d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 1e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< TWO,, , THREE,,>
'
' 1h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO,, , THREE,,>
'
' 2) Split a string delimited by another string:
'
' The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
' The delimiter string is: "[stop]".
'
' 2a) Return all elements:
' The return value contains these 9 elements:
' <><ONE>< ><TWO  ><><  ><THREE><><  >
'
' 2b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 2c) Return all non-empty elements:
' The return value contains these 6 elements:
' <ONE>< ><TWO  ><  ><THREE><  >
'
' 2d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 2e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>
'
' 2g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>
'

Comentários

Os caracteres delimitadores não estão incluídos nos elementos da matriz retornada.

Se essa instância não contiver nenhum dos caracteres em separatorou o parâmetro count for 1, a matriz retornada consistirá em um único elemento que contém essa instância.

Se o parâmetro separator for null ou não contiver caracteres, os caracteres de espaço em branco serão considerados delimitadores. Caracteres de espaço em branco são definidos pelo padrão Unicode e o método Char.IsWhiteSpace retorna true se forem passados para ele.

Para passar null para o parâmetro char[] separator, você deve indicar o tipo do null para desambiguar a chamada de algumas outras sobrecargas, como Split(String[], Int32, StringSplitOptions). O exemplo a seguir mostra várias maneiras de identificar de forma inequívoca essa sobrecarga.

string phrase = "The quick  brown fox";

_ = phrase.Split(default(char[]), 3, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split((char[]?)null, 3, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split(null as char[], 3, StringSplitOptions.RemoveEmptyEntries);

let phrase = "The quick  brown fox"

phrase.Split(Unchecked.defaultof<char[]>, 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split(null :> char[], 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split((null: char[]), 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, Char()), 3,
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New Char() {}, 3,
                     StringSplitOptions.RemoveEmptyEntries)

Se o parâmetro count for zero ou o parâmetro options for RemoveEmptyEntries e o comprimento dessa instância for zero, uma matriz vazia será retornada.

Cada elemento de separator define um caractere delimitador separado. Se o parâmetro options for Nonee dois delimitadores forem adjacentes ou um delimitador for encontrado no início ou no final desta instância, o elemento de matriz correspondente conterá Empty.

Se houver mais de count subcadeias de caracteres nesta instância, as primeiras count menos 1 subcadeias de caracteres serão retornadas no primeiro count menos 1 elementos do valor retornado e os caracteres restantes nesta instância serão retornados no último elemento do valor retornado.

Se count for maior que o número de subcadeias de caracteres, as subcadeias de caracteres disponíveis serão retornadas e nenhuma exceção será gerada.

Considerações sobre desempenho

Os métodos Split alocam memória para o objeto de matriz retornado e um objeto String para cada elemento de matriz. Se o aplicativo exigir um desempenho ideal ou se o gerenciamento da alocação de memória for fundamental em seu aplicativo, considere usar o método IndexOf ou IndexOfAny e, opcionalmente, o método Compare, para localizar uma subcadeia de caracteres dentro de uma cadeia de caracteres.

Se você estiver dividindo uma cadeia de caracteres em um caractere separador, use o método IndexOf ou IndexOfAny para localizar um caractere separador na cadeia de caracteres. Se você estiver dividindo uma cadeia de caracteres em uma cadeia de caracteres separadora, use o método IndexOf ou IndexOfAny para localizar o primeiro caractere da cadeia de caracteres separador. Em seguida, use o método Compare para determinar se os caracteres após o primeiro caractere são iguais aos caracteres restantes da cadeia de caracteres do separador.

Além disso, se o mesmo conjunto de caracteres for usado para dividir cadeias de caracteres em várias chamadas de método Split, considere criar uma única matriz e referenciá-la em cada chamada de método. Isso reduz significativamente a sobrecarga adicional de cada chamada de método.

Notas aos Chamadores

No .NET Framework 3.5 e versões anteriores, se o método Split(Char[]) for passado por um separatornull ou não contiver caracteres, o método usará um conjunto ligeiramente diferente de caracteres de espaço em branco para dividir a cadeia de caracteres do que o método Trim(Char[]) faz para cortar a cadeia de caracteres. A partir do .NET Framework 4, ambos os métodos usam um conjunto idêntico de caracteres de espaço em branco Unicode.

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public string[] Split (char separator, int count, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : char * int * StringSplitOptions -> string[]

Public Function Split (separator As Char, count As Integer, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

Parâmetros

Retornos

Uma matriz que contém no máximo count subcadeias de caracteres dessa instância delimitadas por separator.

Comentários

Se a cadeia de caracteres já tiver sido dividida count - 1 vezes, mas o final da cadeia de caracteres não tiver sido atingido, a última cadeia de caracteres na matriz retornada conterá a subcadeia de caracteres à direita restante desta instância, intocada.

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public:
 cli::array <System::String ^> ^ Split(cli::array <System::String ^> ^ separator, StringSplitOptions options);

public string[] Split (string[] separator, StringSplitOptions options);

public string[] Split (string[]? separator, StringSplitOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split (string[] separator, StringSplitOptions options);

member this.Split : string[] * StringSplitOptions -> string[]

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.Split : string[] * StringSplitOptions -> string[]

Public Function Split (separator As String(), options As StringSplitOptions) As String()

Parâmetros

Retornos

Uma matriz cujos elementos contêm as subcadeias de caracteres nesta cadeia de caracteres delimitadas por uma ou mais cadeias de caracteres em separator. Para obter mais informações, consulte a seção Comentários.

Atributos

ComVisibleAttribute

Exceções

Exemplos

O exemplo a seguir ilustra a diferença nas matrizes retornadas chamando o método String.Split(String[], StringSplitOptions) de uma cadeia de caracteres com seu parâmetro options igual a StringSplitOptions.None e StringSplitOptions.RemoveEmptyEntries.

string source = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]";
string[] stringSeparators = new string[] { "[stop]" };
string[] result;

// Display the original string and delimiter string.
Console.WriteLine($"Splitting the string:\n   \"{source}\".");
Console.WriteLine();
Console.WriteLine($"Using the delimiter string:\n   \"{stringSeparators[0]}\"");
Console.WriteLine();

// Split a string delimited by another string and return all elements.
result = source.Split(stringSeparators, StringSplitOptions.None);
Console.WriteLine($"Result including all elements ({result.Length} elements):");
Console.Write("   ");
foreach (string s in result)
{
    Console.Write("'{0}' ", String.IsNullOrEmpty(s) ? "<>" : s);
}
Console.WriteLine();
Console.WriteLine();

// Split delimited by another string and return all non-empty elements.
result = source.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Console.WriteLine($"Result including non-empty elements ({result.Length} elements):");
Console.Write("   ");
foreach (string s in result)
{
    Console.Write("'{0}' ", String.IsNullOrEmpty(s) ? "<>" : s);
}
Console.WriteLine();

// The example displays the following output:
//    Splitting the string:
//       "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
//
//    Using the delimiter string:
//       "[stop]"
//
//    Result including all elements (9 elements):
//       '<>' 'ONE' '<>' 'TWO' '<>' '<>' 'THREE' '<>' '<>'
//
//    Result including non-empty elements (3 elements):
//       'ONE' 'TWO' 'THREE'

let source = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]"
let stringSeparators = [| "[stop]" |]

// Display the original string and delimiter string.
printfn $"Splitting the string:\n   \"{source}\".\n"
printfn $"Using the delimiter string:\n   \"{stringSeparators[0]}\"\n"

// Split a string delimited by another string and return all elements.
let result = source.Split(stringSeparators, StringSplitOptions.None)
printfn $"Result including all elements ({result.Length} elements):"
printf "   "
for s in result do
    printf $"""'{if String.IsNullOrEmpty s then "<>" else s}' """
printfn "\n"

// Split delimited by another string and return all non-empty elements.
let result = source.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
Console.WriteLine($"Result including non-empty elements ({result.Length} elements):")
printf "   "
for s in result do
    printf $"""'{if String.IsNullOrEmpty s then "<>" else s}' """
printfn ""

// The example displays the following output:
//    Splitting the string:
//       "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
//
//    Using the delimiter string:
//       "[stop]"
//
//    let result including all elements (9 elements):
//       '<>' 'ONE' '<>' 'TWO' '<>' '<>' 'THREE' '<>' '<>'
//
//    let result including non-empty elements (3 elements):
//       'ONE' 'TWO' 'THREE'

Dim source As String = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]"
Dim stringSeparators() As String = {"[stop]"}
Dim result() As String

' Display the original string and delimiter string.
Console.WriteLine("Splitting the string:{0}   '{1}'.", vbCrLf, source)
Console.WriteLine()
Console.WriteLine("Using the delimiter string:{0}   '{1}'.",
                vbCrLf, stringSeparators(0))
Console.WriteLine()

' Split a string delimited by another string and return all elements.
result = source.Split(stringSeparators, StringSplitOptions.None)
Console.WriteLine("Result including all elements ({0} elements):",
                result.Length)
Console.Write("   ")
For Each s As String In result
    Console.Write("'{0}' ", IIf(String.IsNullOrEmpty(s), "<>", s))
Next
Console.WriteLine()
Console.WriteLine()

' Split delimited by another string and return all non-empty elements.
result = source.Split(stringSeparators,
                    StringSplitOptions.RemoveEmptyEntries)
Console.WriteLine("Result including non-empty elements ({0} elements):",
                result.Length)
Console.Write("   ")
For Each s As String In result
    Console.Write("'{0}' ", IIf(String.IsNullOrEmpty(s), "<>", s))
Next
Console.WriteLine()

' The example displays the following output:
'    Splitting the string:
'       "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
'    
'    Using the delimiter string:
'       "[stop]"
'    
'    Result including all elements (9 elements):
'       '<>' 'ONE' '<>' 'TWO' '<>' '<>' 'THREE' '<>' '<>'
'    
'    Result including non-empty elements (3 elements):
'       'ONE' 'TWO' 'THREE'

O exemplo a seguir define uma matriz de separadores que incluem pontuação e caracteres de espaço em branco. Passar essa matriz junto com um valor de StringSplitOptions.RemoveEmptyEntries para o método Split(String[], StringSplitOptions) retorna uma matriz que consiste nas palavras individuais da cadeia de caracteres.

string[] separators = { ",", ".", "!", "?", ";", ":", " " };
string value = "The handsome, energetic, young dog was playing with his smaller, more lethargic litter mate.";
string[] words = value.Split(separators, StringSplitOptions.RemoveEmptyEntries);
foreach (var word in words)
    Console.WriteLine(word);

// The example displays the following output:
//       The
//       handsome
//       energetic
//       young
//       dog
//       was
//       playing
//       with
//       his
//       smaller
//       more
//       lethargic
//       litter
//       mate

let separators = [| ","; "."; "!"; "?"; ""; ":"; " " |]
let value = "The handsome, energetic, young dog was playing with his smaller, more lethargic litter mate."
let words = value.Split(separators, StringSplitOptions.RemoveEmptyEntries)
for word in words do
    printfn $"${word}"

// The example displays the following output:
//       The
//       handsome
//       energetic
//       young
//       dog
//       was
//       playing
//       with
//       his
//       smaller
//       more
//       lethargic
//       litter
//       mate

    Dim separators() As String = {",", ".", "!", "?", ";", ":", " "}
    Dim value As String = "The handsome, energetic, young dog was playing with his smaller, more lethargic litter mate."
    Dim words() As String = value.Split(separators, StringSplitOptions.RemoveEmptyEntries)
    For Each word In words
        Console.WriteLine(word)
    Next
End Sub

' The example displays the following output:
'
'       The
'       handsome
'       energetic
'       young
'       dog
'       was
'       playing
'       with
'       his
'       smaller
'       more
'       lethargic
'       litter
'       mate

Observe que o método é chamado com o argumento options definido como StringSplitOptions.RemoveEmptyEntries. Isso impede que a matriz retornada inclua String.Empty valores que representam correspondências de subcadeia de caracteres vazias entre marcas de pontuação e caracteres de espaço em branco.

Comentários

Quando uma cadeia de caracteres é delimitada por um conjunto conhecido de cadeias de caracteres, você pode usar o método Split para separá-la em subcadeias de caracteres.

As cadeias de caracteres delimitador não estão incluídas nos elementos da matriz retornada. Por exemplo, se a matriz separator incluir a cadeia de caracteres "--" e o valor da instância de cadeia de caracteres atual for "aa--bb--cc", o método retornará uma matriz que contém três elementos: "aa", "bb" e "cc".

Se essa instância não contiver nenhuma das cadeias de caracteres em separator, a matriz retornada consistirá em um único elemento que contenha essa instância.

Se o parâmetro options for RemoveEmptyEntries e o comprimento dessa instância for zero, o método retornará uma matriz vazia.

Cada elemento de separator define um delimitador separado que consiste em um ou mais caracteres. Se o argumento options for Nonee dois delimitadores forem adjacentes ou um delimitador for encontrado no início ou no final desta instância, o elemento de matriz correspondente conterá String.Empty. Por exemplo, se separator incluir dois elementos, "-" e "_", o valor da instância da cadeia de caracteres será "-_aa-_", e o valor do argumento options for None, o método retornará uma matriz de cadeia de caracteres com os cinco elementos a seguir:

1. String.Empty, que representa a cadeia de caracteres vazia que precede a subcadeia de caracteres "-" no índice 0.

2. String.Empty, que representa a cadeia de caracteres vazia entre a subcadeia de caracteres "-" no índice 0 e a subcadeia de caracteres "_" no índice 1.

3. "aa".

4. String.Empty, que representa a cadeia de caracteres vazia que segue a subcadeia de caracteres "-" no índice 4.

5. String.Empty, que representa a cadeia de caracteres vazia que segue a subcadeia de caracteres "_" no índice 5.

A matriz do separador

Se qualquer um dos elementos em separator consistir em vários caracteres, toda a subcadeia de caracteres será considerada um delimitador. Por exemplo, se um dos elementos no separator for "10", tentar dividir a cadeia de caracteres "This10is10a10string" retornará a seguinte matriz de quatro elementos: { "This", "is", "a", "string". }.

Se o parâmetro separator for null ou não contiver cadeias de caracteres não vazias, os caracteres de espaço em branco serão considerados delimitadores. Caracteres de espaço em branco são definidos pelo padrão Unicode e o método Char.IsWhiteSpace retorna true se forem passados para ele.

Para passar null para o parâmetro string[] separator, você deve indicar o tipo do null para desambiguar a chamada de algumas outras sobrecargas, como Split(Char[], StringSplitOptions). O exemplo a seguir mostra várias maneiras de identificar de forma inequívoca essa sobrecarga.

string phrase = "The quick  brown fox";

_ = phrase.Split(default(string[]), StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split((string[]?)null, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split(null as string[], StringSplitOptions.RemoveEmptyEntries);

let phrase = "The quick  brown fox"

phrase.Split(Unchecked.defaultof<string[]>, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split(null :> string[], StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split((null: string[]), StringSplitOptions.RemoveEmptyEntries) |> ignore

Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, String()),
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New String() {},
                     StringSplitOptions.RemoveEmptyEntries)

Detalhes da comparação

O método Split extrai as subcadeias de caracteres nesta cadeia de caracteres delimitadas por uma ou mais das cadeias de caracteres no parâmetro separator e retorna essas subcadeias de caracteres como elementos de uma matriz.

O método Split procura delimitadores executando comparações usando regras de classificação ordinais que diferenciam maiúsculas de minúsculas. Para obter mais informações sobre classificações de palavra, cadeia de caracteres e ordinais, consulte a enumeração System.Globalization.CompareOptions.

O método Split ignora qualquer elemento de separator cujo valor é null ou a cadeia de caracteres vazia ("").

Para evitar resultados ambíguos quando cadeias de caracteres em separator têm caracteres em comum, a operação Split prossegue do início ao final do valor da instância e corresponde ao primeiro elemento em separator que é igual a um delimitador na instância. A ordem na qual as subcadeias de caracteres são encontradas na instância tem precedência sobre a ordem dos elementos em separator.

Por exemplo, considere uma instância cujo valor é "abcdef". Se o primeiro elemento em separator fosse "ef" e o segundo elemento fosse "bcde", o resultado da operação de divisão seria uma matriz de cadeia de caracteres que contém dois elementos, "a" e "f". Isso ocorre porque a subcadeia de caracteres na instância, "bcde", é encontrada e corresponde a um elemento em separator antes da subcadeia de caracteres "f" ser encontrada.

No entanto, se o primeiro elemento de separator fosse "bcd" e o segundo elemento fosse "bc", o resultado da operação de divisão seria uma matriz de cadeia de caracteres que contém dois elementos, "a" e "ef". Isso ocorre porque "bcd" é o primeiro delimitador em separator que corresponde a um delimitador na instância. Se a ordem dos separadores foi invertida para que o primeiro elemento fosse "bc" e o segundo elemento fosse "bcd", o resultado seria uma matriz de cadeia de caracteres que contém dois elementos, "a" e "def".

Considerações sobre desempenho

Os métodos Split alocam memória para o objeto de matriz retornado e um objeto String para cada elemento de matriz. Se o aplicativo exigir um desempenho ideal ou se o gerenciamento da alocação de memória for fundamental em seu aplicativo, considere usar o método IndexOf ou IndexOfAny e, opcionalmente, o método Compare, para localizar uma subcadeia de caracteres dentro de uma cadeia de caracteres.

Se você estiver dividindo uma cadeia de caracteres em um caractere separador, use o método IndexOf ou IndexOfAny para localizar um caractere separador na cadeia de caracteres. Se você estiver dividindo uma cadeia de caracteres em uma cadeia de caracteres separadora, use o método IndexOf ou IndexOfAny para localizar o primeiro caractere da cadeia de caracteres separador. Em seguida, use o método Compare para determinar se os caracteres após o primeiro caractere são iguais aos caracteres restantes da cadeia de caracteres do separador.

Além disso, se o mesmo conjunto de caracteres for usado para dividir cadeias de caracteres em várias chamadas de método Split, considere criar uma única matriz e referenciá-la em cada chamada de método. Isso reduz significativamente a sobrecarga adicional de cada chamada de método.

Notas aos Chamadores

No .NET Framework 3.5 e versões anteriores, se o método Split(Char[]) for passado por um separatornull ou não contiver caracteres, o método usará um conjunto ligeiramente diferente de caracteres de espaço em branco para dividir a cadeia de caracteres do que o método Trim(Char[]) faz para cortar a cadeia de caracteres. A partir do .NET Framework 4, ambos os métodos usam um conjunto idêntico de caracteres de espaço em branco Unicode.

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public string[] Split (string? separator, StringSplitOptions options = System.StringSplitOptions.None);

public string[] Split (string separator, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : string * StringSplitOptions -> string[]

Public Function Split (separator As String, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

Parâmetros

Retornos

Uma matriz cujos elementos contêm as subcadeias de caracteres dessa instância delimitadas por separator.

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public:
 cli::array <System::String ^> ^ Split(... cli::array <char> ^ separator);

public string[] Split (params char[] separator);

public string[] Split (params char[]? separator);

member this.Split : char[] -> string[]

Public Function Split (ParamArray separator As Char()) As String()

Parâmetros

Retornos

Uma matriz cujos elementos contêm as subcadeias de caracteres dessa instância delimitadas por um ou mais caracteres em separator. Para obter mais informações, consulte a seção Comentários.

Exemplos

O exemplo a seguir demonstra como extrair palavras individuais de um bloco de texto tratando o caractere de espaço ( ) e o caractere de guia (\t) como delimitadores. A cadeia de caracteres que está sendo dividida inclui ambos os caracteres.

string s = "Today\tI'm going to school";
string[] subs = s.Split(' ', '\t');

foreach (var sub in subs)
{
    Console.WriteLine($"Substring: {sub}");
}

// This example produces the following output:
//
// Substring: Today
// Substring: I'm
// Substring: going
// Substring: to
// Substring: school

let s = "Today\tI'm going to school"
let subs = s.Split(' ', '\t')

for sub in subs do
    printfn $"Substring: {sub}"

// This example produces the following output:
//
// Substring: Today
// Substring: I'm
// Substring: going
// Substring: to
// Substring: school

Dim s As String = "Today" & vbTab & "I'm going to school"
Dim subs As String() = s.Split(" "c, Char.Parse(vbTab))

For Each substring In subs
    Console.WriteLine("Substring: " & substring)
Next

' This example produces the following output:
'
' Substring: Today
' Substring: I 'm
' Substring: going
' Substring: to
' Substring: school

Comentários

Quando uma cadeia de caracteres é delimitada por um conjunto conhecido de caracteres, você pode usar o método Split(Char[]) para separá-la em subcadeias de caracteres.

Os caracteres delimitadores não estão incluídos nos elementos da matriz retornada. Por exemplo, se a matriz do separador incluir o caractere "-" e o valor da instância de cadeia de caracteres atual for "aa-bb-cc", o método retornará uma matriz que contém três elementos: "aa", "bb" e "cc".

Se essa instância não contiver nenhum dos caracteres em separator, a matriz retornada consistirá em um único elemento que contenha essa instância.

Cada elemento de separator define um caractere delimitador separado. Se dois delimitadores forem adjacentes ou um delimitador for encontrado no início ou no final desta instância, o elemento correspondente na matriz retornada conterá Empty.

A tabela a seguir mostra alguns exemplos.

A matriz do separador

Cada elemento do separador define um delimitador separado que consiste em um único caractere.

Se o argumento separator for null ou não contiver caracteres, o método tratará caracteres de espaço em branco como delimitadores. Caracteres de espaço em branco são definidos pelo padrão Unicode e o método Char.IsWhiteSpace retorna true se um caractere de espaço em branco é passado para ele.

Resolução de sobrecarga string.split(Char[]) e compilador

Embora o único parâmetro para essa sobrecarga de String.Split seja uma matriz de caracteres, você pode chamá-lo com um único caractere, como mostra o exemplo a seguir.

string value = "This is a short string.";
char delimiter = 's';
string[] substrings = value.Split(delimiter);
foreach (var substring in substrings)
    Console.WriteLine(substring);

// The example displays the following output:
//     Thi
//      i
//      a
//     hort
//     tring.

let value = "This is a short string."
let delimiter = 's'
let substrings = value.Split delimiter
for substring in substrings do
    printfn $"{substring}"

// The example displays the following output:
//     Thi
//      i
//      a
//     hort
//     tring.

    Dim value As String = "This is a short string."
    Dim delimiter As Char = "s"c
    Dim substrings() As String = value.Split(delimiter)
    For Each substring In substrings
        Console.WriteLine(substring)
    Next
End Sub

' The example displays the following output:
'
'     Thi
'      i
'      a
'     hort
'     tring.

Como o parâmetro separator é decorado com o atributo ParamArrayAttribute, os compiladores interpretarão um único caractere como uma matriz de caracteres de elemento único. Esse não é o caso de outras sobrecargas String.Split que incluem um parâmetro separator; você deve passar explicitamente essas sobrecargas em uma matriz de caracteres como o argumento separator.

Detalhes da comparação

O método Split(Char[]) extrai as subcadeias de caracteres nesta cadeia de caracteres delimitadas por um ou mais caracteres na matriz separator e retorna essas subcadeias de caracteres como elementos de uma matriz.

O método Split(Char[]) procura delimitadores executando comparações usando regras de classificação ordinais que diferenciam maiúsculas de minúsculas. Para obter mais informações sobre classificações de palavra, cadeia de caracteres e ordinais, consulte a enumeração System.Globalization.CompareOptions.

Considerações sobre desempenho

Os métodos Split alocam memória para o objeto de matriz retornado e um objeto String para cada elemento de matriz. Se o aplicativo exigir um desempenho ideal ou se o gerenciamento da alocação de memória for fundamental em seu aplicativo, considere usar o método IndexOf ou IndexOfAny. Você também tem a opção de usar o método Compare para localizar uma subcadeia de caracteres dentro de uma cadeia de caracteres.

Para dividir uma cadeia de caracteres em um caractere separador, use o método IndexOf ou IndexOfAny para localizar um caractere separador na cadeia de caracteres. Para dividir uma cadeia de caracteres em uma cadeia de caracteres separador, use o método IndexOf ou IndexOfAny para localizar o primeiro caractere da cadeia de caracteres do separador. Em seguida, use o método Compare para determinar se os caracteres após o primeiro caractere são iguais aos caracteres restantes da cadeia de caracteres do separador.

Além disso, se o mesmo conjunto de caracteres for usado para dividir cadeias de caracteres em várias chamadas de método Split, considere criar uma única matriz e referenciá-la em cada chamada de método. Isso reduz significativamente a sobrecarga adicional de cada chamada de método.

Notas aos Chamadores

No .NET Framework 3.5 e versões anteriores, se o método Split(Char[]) for passado por um separatornull ou não contiver caracteres, o método usará um conjunto ligeiramente diferente de caracteres de espaço em branco para dividir a cadeia de caracteres do que o método Trim(Char[]) faz para cortar a cadeia de caracteres. A partir do .NET Framework 4, ambos os métodos usam um conjunto idêntico de caracteres de espaço em branco Unicode.

Confira também

• Char
• Concat(Object)
• Insert(Int32, String)
• Join(String, String[])
• Remove(Int32, Int32)
• Replace(Char, Char)
• Substring(Int32)
• Trim(Char[])

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public:
 cli::array <System::String ^> ^ Split(cli::array <char> ^ separator, int count);

public string[] Split (char[] separator, int count);

public string[] Split (char[]? separator, int count);

member this.Split : char[] * int -> string[]

Public Function Split (separator As Char(), count As Integer) As String()

Parâmetros

Retornos

Uma matriz cujos elementos contêm as subcadeias de caracteres nesta instância delimitadas por um ou mais caracteres em separator. Para obter mais informações, consulte a seção Comentários.

Exceções

Exemplos

O exemplo a seguir demonstra como count pode ser usado para limitar o número de cadeias de caracteres retornadas por Split.

string name = "Alex Johnson III";

string[] subs = name.Split(null, 2);

string firstName = subs[0];
string lastName;
if (subs.Length > 1)
{
    lastName = subs[1];
}

// firstName = "Alex"
// lastName = "Johnson III"

let name = "Alex Johnson III"

let subs = name.Split(null, 2)

let firstName = subs[0]
let lastName =
    if subs.Length > 1 then
        subs[1]
    else
        ""

// firstName = "Alex"
// lastName = "Johnson III"

Console.WriteLine("What is your name?")
Dim name As String = Console.ReadLine()

Dim substrings = name.Split(" "c, count:=2)
Dim firstName As String = substrings(0)
Dim lastName As String

If substrings.Length > 1 Then
    lastName = substrings(1)
End If

Console.WriteLine("firstName = ""{0}""", firstName)
Console.WriteLine("lastName = ""{0}""", lastName)

' If the user enters "Alex Johnson III":
' firstName = "Alex"
' lastName = "Johnson III"

Comentários

Os caracteres delimitadores não estão incluídos nos elementos da matriz retornada.

Se essa instância não contiver nenhum dos caracteres em separator, a matriz retornada consistirá em um único elemento que contenha essa instância. Se count for zero, uma matriz vazia será retornada.

Se o parâmetro separator for null ou não contiver caracteres, os caracteres de espaço em branco serão considerados delimitadores. Caracteres de espaço em branco são definidos pelo padrão Unicode e o método Char.IsWhiteSpace retorna true se forem passados para ele.

Cada elemento de separator define um caractere delimitador separado. Se dois delimitadores forem adjacentes ou um delimitador for encontrado no início ou no final desta instância, o elemento de matriz correspondente conterá Empty.

Se houver mais de count subcadeias de caracteres nesta instância, as primeiras subcadeias de caracteres count - 1 serão retornadas no primeiro count - 1 elementos do valor retornado e os caracteres restantes nesta instância serão retornados no último elemento do valor retornado.

Se count for maior que o número de subcadeias de caracteres, as subcadeias de caracteres disponíveis serão retornadas e nenhuma exceção será gerada.

A tabela a seguir mostra alguns exemplos.

Considerações sobre desempenho

Os métodos Split alocam memória para o objeto de matriz retornado e um objeto String para cada elemento de matriz. Se o aplicativo exigir um desempenho ideal ou se o gerenciamento da alocação de memória for fundamental em seu aplicativo, considere usar o método IndexOf ou IndexOfAny e, opcionalmente, o método Compare, para localizar uma subcadeia de caracteres dentro de uma cadeia de caracteres.

Se você estiver dividindo uma cadeia de caracteres em um caractere separador, use o método IndexOf ou IndexOfAny para localizar um caractere separador na cadeia de caracteres. Se você estiver dividindo uma cadeia de caracteres em uma cadeia de caracteres separadora, use o método IndexOf ou IndexOfAny para localizar o primeiro caractere da cadeia de caracteres separador. Em seguida, use o método Compare para determinar se os caracteres após o primeiro caractere são iguais aos caracteres restantes da cadeia de caracteres do separador.

Além disso, se o mesmo conjunto de caracteres for usado para dividir cadeias de caracteres em várias chamadas de método Split, considere criar uma única matriz e referenciá-la em cada chamada de método. Isso reduz significativamente a sobrecarga adicional de cada chamada de método.

Notas aos Chamadores

No .NET Framework 3.5 e versões anteriores, se o método Split(Char[]) for passado por um separatornull ou não contiver caracteres, o método usará um conjunto ligeiramente diferente de caracteres de espaço em branco para dividir a cadeia de caracteres do que o método Trim(Char[]) faz para cortar a cadeia de caracteres. A partir do .NET Framework 4, ambos os métodos usam um conjunto idêntico de caracteres de espaço em branco Unicode.

Confira também

• Char
• Array
• Int32
• Concat(Object)
• Insert(Int32, String)
• Join(String, String[])
• Remove(Int32, Int32)
• Replace(Char, Char)
• Substring(Int32)
• Trim(Char[])

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public string[] Split (char separator, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : char * StringSplitOptions -> string[]

Public Function Split (separator As Char, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

Parâmetros

Retornos

Uma matriz cujos elementos contêm as subcadeias de caracteres dessa instância delimitadas por separator.

public:
 cli::array <System::String ^> ^ Split(ReadOnlySpan<char> separator);

public string[] Split (scoped ReadOnlySpan<char> separator);

member this.Split : ReadOnlySpan<char> -> string[]

Public Function Split (separator As ReadOnlySpan(Of Char)) As String()

Parâmetros

Retornos

Uma matriz cujos elementos contêm as subcadeias de caracteres dessa instância delimitadas por um ou mais caracteres em separator.

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public:
 cli::array <System::String ^> ^ Split(cli::array <System::String ^> ^ separator, int count, StringSplitOptions options);

public string[] Split (string[] separator, int count, StringSplitOptions options);

public string[] Split (string[]? separator, int count, StringSplitOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split (string[] separator, int count, StringSplitOptions options);

member this.Split : string[] * int * StringSplitOptions -> string[]

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.Split : string[] * int * StringSplitOptions -> string[]

Public Function Split (separator As String(), count As Integer, options As StringSplitOptions) As String()

Parâmetros

Retornos

Uma matriz cujos elementos contêm as subcadeias de caracteres nesta cadeia de caracteres delimitadas por uma ou mais cadeias de caracteres em separator. Para obter mais informações, consulte a seção Comentários.

Atributos

ComVisibleAttribute

Exceções

Exemplos

O exemplo a seguir usa a enumeração StringSplitOptions para incluir ou excluir subcadeias de caracteres geradas pelo método Split.

// This example demonstrates the String.Split(Char[], Boolean) and 
//                               String.Split(Char[], Int32, Boolean) methods
using namespace System;
void Show( array<String^>^entries )
{
   Console::WriteLine( "The return value contains these {0} elements:", entries->Length );
   System::Collections::IEnumerator^ myEnum = entries->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ entry = safe_cast<String^>(myEnum->Current);
      Console::Write( "<{0}>", entry );
   }

   Console::Write( "{0}{0}", Environment::NewLine );
}

int main()
{
   String^ s = ",one,,,two,,,,,three,,";
   array<Char>^sep = gcnew array<Char>{
      ','
   };
   array<String^>^result;
   
   //
   Console::WriteLine( "The original string is \"{0}\".", s );
   Console::WriteLine( "The separation character is '{0}'.", sep[ 0 ] );
   Console::WriteLine();
   
   //
   Console::WriteLine( "Split the string and return all elements:" );
   result = s->Split( sep, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return all non-empty elements:" );
   result = s->Split( sep, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 elements:" );
   result = s->Split( sep, 2, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 non-empty elements:" );
   result = s->Split( sep, 2, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
}

/*
This example produces the following results:

The original string is ",one,,,two,,,,,three,,".
The separation character is ','.

Split the string and return all elements:
The return value contains these 12 elements:
<><one><><><two><><><><><three><><>

Split the string and return all non-empty elements:
The return value contains these 3 elements:
<one><two><three>

Split the string and return 2 elements:
The return value contains these 2 elements:
<><one,,,two,,,,,three,,>

Split the string and return 2 non-empty elements:
The return value contains these 2 elements:
<one><,,two,,,,,three,,>

*/

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Example 1: Split a string delimited by characters
Console.WriteLine("1) Split a string delimited by characters:\n");

string s1 = ",ONE,, TWO,, , THREE,,";
char[] charSeparators = new char[] { ',' };
string[] result;

Console.WriteLine($"The original string is: \"{s1}\".");
Console.WriteLine($"The delimiter character is: '{charSeparators[0]}'.\n");

// Split the string and return all elements
Console.WriteLine("1a) Return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("1b) Return all elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("1c) Return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("1e) Split into only two elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1f) Split into only two elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("1g) Split into only two non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Example 2: Split a string delimited by another string
Console.WriteLine("2) Split a string delimited by another string:\n");

string s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  ";
string[] stringSeparators = new string[] { "[stop]" };

Console.WriteLine($"The original string is: \"{s2}\".");
Console.WriteLine($"The delimiter string is: \"{stringSeparators[0]}\".\n");

// Split the string and return all elements
Console.WriteLine("2a) Return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("2b) Return all elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("2c) Return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("2e) Split into only two elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2f) Split into only two elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("2g) Split into only two non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Display the array of separated strings using a local function
void Show(string[] entries)
{
    Console.WriteLine($"The return value contains these {entries.Length} elements:");
    foreach (string entry in entries)
    {
        Console.Write($"<{entry}>");
    }
    Console.Write("\n\n");
}

/*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*/

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Display the array of separated strings using a local function
let show  (entries: string[]) =
    printfn $"The return value contains these {entries.Length} elements:"
    for entry in entries do
        printf $"<{entry}>"
    printf "\n\n"

// Example 1: Split a string delimited by characters
printfn "1) Split a string delimited by characters:\n"

let s1 = ",ONE,, TWO,, , THREE,,"
let charSeparators = [| ',' |]

printfn $"The original string is: \"{s1}\"."
printfn $"The delimiter character is: '{charSeparators[0]}'.\n"

// Split the string and return all elements
printfn "1a) Return all elements:"
let result = s1.Split(charSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "1b) Return all elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "1c) Return all non-empty elements:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "1d) Return all non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "1e) Split into only two elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "1f) Split into only two elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "1g) Split into only two non-empty elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "1h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Example 2: Split a string delimited by another string
printfn "2) Split a string delimited by another string:\n"

let s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  "
let stringSeparators = [| "[stop]" |]

printfn $"The original string is: \"{s2}\"."
printfn $"The delimiter string is: \"{stringSeparators[0]}\".\n"

// Split the string and return all elements
printfn "2a) Return all elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "2b) Return all elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "2c) Return all non-empty elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "2d) Return all non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "2e) Split into only two elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "2f) Split into only two elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "2g) Split into only two non-empty elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "2h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result

(*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*)

Public Shared Sub StringSplitOptionsExamples()
    ' This example demonstrates the String.Split() methods that use
    ' the StringSplitOptions enumeration.

    ' Example 1: Split a string delimited by characters
    Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)

    Dim s1 As String = ",ONE,, TWO,, , THREE,,"
    Dim charSeparators() As Char = {","c}
    Dim result() As String

    Console.WriteLine("The original string is: ""{0}"".", s1)
    Console.WriteLine("The delimiter character is: '{0}'." & vbCrLf, charSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("1a) Return all elements:")
    result = s1.Split(charSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("1b) Return all elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("1c) Return all non-empty elements:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("1e) Split into only two elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1f) Split into only two elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("1g) Split into only two non-empty elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Example 2: Split a string delimited by another string
    Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)

    Dim s2 As String = "[stop]" +
                "ONE[stop] [stop]" +
                "TWO  [stop][stop]  [stop]" +
                "THREE[stop][stop]  "
    Dim stringSeparators() As String = {"[stop]"}


    Console.WriteLine("The original string is: ""{0}"".", s2)
    Console.WriteLine("The delimiter string is: ""{0}""." & vbCrLf, stringSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("2a) Return all elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("2b) Return all elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("2c) Return all non-empty elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("2e) Split into only two elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2f) Split into only two elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("2g) Split into only two non-empty elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)

End Sub

' Display the array of separated strings.
Public Shared Sub Show(ByVal entries() As String)
    Console.WriteLine("The return value contains these {0} elements:", entries.Length)
    Dim entry As String
    For Each entry In entries
        Console.Write("<{0}>", entry)
    Next entry
    Console.Write(vbCrLf & vbCrLf)

End Sub

'This example produces the following results:
'
' 1) Split a string delimited by characters:
'
' The original string is: ",ONE,, TWO,, , THREE,,".
' The delimiter character is: ','.
'
' 1a) Return all elements:
' The return value contains these 9 elements:
' <><ONE><>< TWO><>< >< THREE><><>
'
' 1b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 1c) Return all non-empty elements:
' The return value contains these 4 elements:
' <ONE>< TWO>< >< THREE>
'
' 1d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 1e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< TWO,, , THREE,,>
'
' 1h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO,, , THREE,,>
'
' 2) Split a string delimited by another string:
'
' The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
' The delimiter string is: "[stop]".
'
' 2a) Return all elements:
' The return value contains these 9 elements:
' <><ONE>< ><TWO  ><><  ><THREE><><  >
'
' 2b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 2c) Return all non-empty elements:
' The return value contains these 6 elements:
' <ONE>< ><TWO  ><  ><THREE><  >
'
' 2d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 2e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>
'
' 2g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>
'

Comentários

As cadeias de caracteres delimitador não estão incluídas nos elementos da matriz retornada.

Se essa instância não contiver nenhuma das cadeias de caracteres em separatorou o parâmetro count for 1, a matriz retornada consistirá em um único elemento que contém essa instância.

Se o parâmetro separator for null ou não contiver caracteres, os caracteres de espaço em branco serão considerados delimitadores. Caracteres de espaço em branco são definidos pelo padrão Unicode e o método Char.IsWhiteSpace retorna true se forem passados para ele.

Para passar null para o parâmetro string[] separator, você deve indicar o tipo do null para desambiguar a chamada de algumas outras sobrecargas, como Split(Char[], Int32, StringSplitOptions). O exemplo a seguir mostra várias maneiras de identificar de forma inequívoca essa sobrecarga.

string phrase = "The quick  brown fox";

_ = phrase.Split(default(string[]), 3, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split((string[]?)null, 3, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split(null as string[], 3, StringSplitOptions.RemoveEmptyEntries);

let phrase = "The quick  brown fox"

phrase.Split(Unchecked.defaultof<string[]>, 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split(null :> string[], 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split((null: string[]), 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, String()), 3,
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New String() {}, 3,
                     StringSplitOptions.RemoveEmptyEntries)

Se o parâmetro count for zero ou o parâmetro options for RemoveEmptyEntries e o comprimento dessa instância for zero, uma matriz vazia será retornada.

Cada elemento de separator define um delimitador separado que consiste em um ou mais caracteres. Se o parâmetro options for Nonee dois delimitadores forem adjacentes ou um delimitador for encontrado no início ou no final desta instância, o elemento de matriz correspondente conterá Empty.

Se houver mais de count subcadeias de caracteres nesta instância, as primeiras count menos 1 subcadeias de caracteres serão retornadas no primeiro count menos 1 elementos do valor retornado e os caracteres restantes nesta instância serão retornados no último elemento do valor retornado.

Se count for maior que o número de subcadeias de caracteres, as subcadeias de caracteres disponíveis serão retornadas e nenhuma exceção será gerada.

A matriz do separador

Se qualquer um dos elementos em separator consistir em vários caracteres, toda a subcadeia de caracteres será considerada um delimitador. Por exemplo, se um dos elementos no separator for "10", tentar dividir a cadeia de caracteres "This10is10a10string" retornará esta matriz de quatro elementos: { "This", "is", "a", "string". }.

Detalhes da comparação

O método Split extrai as subcadeias de caracteres nesta cadeia de caracteres delimitadas por uma ou mais das cadeias de caracteres no parâmetro separator e retorna essas subcadeias de caracteres como elementos de uma matriz.

O método Split procura delimitadores executando comparações usando regras de classificação ordinais que diferenciam maiúsculas de minúsculas. Para obter mais informações sobre classificações de palavra, cadeia de caracteres e ordinais, consulte a enumeração System.Globalization.CompareOptions.

O método Split ignora qualquer elemento de separator cujo valor é null ou a cadeia de caracteres vazia ("").

Para evitar resultados ambíguos quando cadeias de caracteres em separator têm caracteres em comum, o método Split prossegue do início ao final do valor da instância e corresponde ao primeiro elemento em separator que é igual a um delimitador na instância. A ordem na qual as subcadeias de caracteres são encontradas na instância tem precedência sobre a ordem dos elementos em separator.

Por exemplo, considere uma instância cujo valor é "abcdef". Se o primeiro elemento em separator fosse "ef" e o segundo elemento fosse "bcde", o resultado da operação de divisão seria "a" e "f". Isso ocorre porque a subcadeia de caracteres na instância, "bcde", é encontrada e corresponde a um elemento em separator antes da subcadeia de caracteres "f" ser encontrada.

No entanto, se o primeiro elemento de separator fosse "bcd" e o segundo elemento fosse "bc", o resultado da operação de divisão seria "a" e "ef". Isso ocorre porque "bcd" é o primeiro delimitador em separator que corresponde a um delimitador na instância. Se a ordem dos separadores foi invertida para que o primeiro elemento fosse "bc" e o segundo elemento fosse "bcd", o resultado seria "a" e "def".

Considerações sobre desempenho

Os métodos Split alocam memória para o objeto de matriz retornado e um objeto String para cada elemento de matriz. Se o aplicativo exigir um desempenho ideal ou se o gerenciamento da alocação de memória for fundamental em seu aplicativo, considere usar o método IndexOf ou IndexOfAny e, opcionalmente, o método Compare, para localizar uma subcadeia de caracteres dentro de uma cadeia de caracteres.

Se você estiver dividindo uma cadeia de caracteres em um caractere separador, use o método IndexOf ou IndexOfAny para localizar um caractere separador na cadeia de caracteres. Se você estiver dividindo uma cadeia de caracteres em uma cadeia de caracteres separadora, use o método IndexOf ou IndexOfAny para localizar o primeiro caractere da cadeia de caracteres separador. Em seguida, use o método Compare para determinar se os caracteres após o primeiro caractere são iguais aos caracteres restantes da cadeia de caracteres do separador.

Além disso, se o mesmo conjunto de caracteres for usado para dividir cadeias de caracteres em várias chamadas de método Split, considere criar uma única matriz e referenciá-la em cada chamada de método. Isso reduz significativamente a sobrecarga adicional de cada chamada de método.

Notas aos Chamadores

No .NET Framework 3.5 e versões anteriores, se o método Split(Char[]) for passado por um separatornull ou não contiver caracteres, o método usará um conjunto ligeiramente diferente de caracteres de espaço em branco para dividir a cadeia de caracteres do que o método Trim(Char[]) faz para cortar a cadeia de caracteres. A partir do .NET Framework 4, ambos os métodos usam um conjunto idêntico de caracteres de espaço em branco Unicode.

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

Origem:

String.Manipulation.cs

public:
 cli::array <System::String ^> ^ Split(cli::array <char> ^ separator, StringSplitOptions options);

public string[] Split (char[] separator, StringSplitOptions options);

public string[] Split (char[]? separator, StringSplitOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split (char[] separator, StringSplitOptions options);

member this.Split : char[] * StringSplitOptions -> string[]

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.Split : char[] * StringSplitOptions -> string[]

Public Function Split (separator As Char(), options As StringSplitOptions) As String()

Parâmetros

Retornos

Uma matriz cujos elementos contêm as subcadeias de caracteres nesta cadeia de caracteres delimitadas por um ou mais caracteres em separator. Para obter mais informações, consulte a seção Comentários.

Atributos

ComVisibleAttribute

Exceções

Exemplos

O exemplo a seguir usa a enumeração StringSplitOptions para incluir ou excluir subcadeias de caracteres geradas pelo método Split.

// This example demonstrates the String.Split(Char[], Boolean) and 
//                               String.Split(Char[], Int32, Boolean) methods
using namespace System;
void Show( array<String^>^entries )
{
   Console::WriteLine( "The return value contains these {0} elements:", entries->Length );
   System::Collections::IEnumerator^ myEnum = entries->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ entry = safe_cast<String^>(myEnum->Current);
      Console::Write( "<{0}>", entry );
   }

   Console::Write( "{0}{0}", Environment::NewLine );
}

int main()
{
   String^ s = ",one,,,two,,,,,three,,";
   array<Char>^sep = gcnew array<Char>{
      ','
   };
   array<String^>^result;
   
   //
   Console::WriteLine( "The original string is \"{0}\".", s );
   Console::WriteLine( "The separation character is '{0}'.", sep[ 0 ] );
   Console::WriteLine();
   
   //
   Console::WriteLine( "Split the string and return all elements:" );
   result = s->Split( sep, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return all non-empty elements:" );
   result = s->Split( sep, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 elements:" );
   result = s->Split( sep, 2, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 non-empty elements:" );
   result = s->Split( sep, 2, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
}

/*
This example produces the following results:

The original string is ",one,,,two,,,,,three,,".
The separation character is ','.

Split the string and return all elements:
The return value contains these 12 elements:
<><one><><><two><><><><><three><><>

Split the string and return all non-empty elements:
The return value contains these 3 elements:
<one><two><three>

Split the string and return 2 elements:
The return value contains these 2 elements:
<><one,,,two,,,,,three,,>

Split the string and return 2 non-empty elements:
The return value contains these 2 elements:
<one><,,two,,,,,three,,>

*/

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Example 1: Split a string delimited by characters
Console.WriteLine("1) Split a string delimited by characters:\n");

string s1 = ",ONE,, TWO,, , THREE,,";
char[] charSeparators = new char[] { ',' };
string[] result;

Console.WriteLine($"The original string is: \"{s1}\".");
Console.WriteLine($"The delimiter character is: '{charSeparators[0]}'.\n");

// Split the string and return all elements
Console.WriteLine("1a) Return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("1b) Return all elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("1c) Return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("1e) Split into only two elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1f) Split into only two elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("1g) Split into only two non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Example 2: Split a string delimited by another string
Console.WriteLine("2) Split a string delimited by another string:\n");

string s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  ";
string[] stringSeparators = new string[] { "[stop]" };

Console.WriteLine($"The original string is: \"{s2}\".");
Console.WriteLine($"The delimiter string is: \"{stringSeparators[0]}\".\n");

// Split the string and return all elements
Console.WriteLine("2a) Return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("2b) Return all elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("2c) Return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("2e) Split into only two elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2f) Split into only two elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("2g) Split into only two non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Display the array of separated strings using a local function
void Show(string[] entries)
{
    Console.WriteLine($"The return value contains these {entries.Length} elements:");
    foreach (string entry in entries)
    {
        Console.Write($"<{entry}>");
    }
    Console.Write("\n\n");
}

/*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*/

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Display the array of separated strings using a local function
let show  (entries: string[]) =
    printfn $"The return value contains these {entries.Length} elements:"
    for entry in entries do
        printf $"<{entry}>"
    printf "\n\n"

// Example 1: Split a string delimited by characters
printfn "1) Split a string delimited by characters:\n"

let s1 = ",ONE,, TWO,, , THREE,,"
let charSeparators = [| ',' |]

printfn $"The original string is: \"{s1}\"."
printfn $"The delimiter character is: '{charSeparators[0]}'.\n"

// Split the string and return all elements
printfn "1a) Return all elements:"
let result = s1.Split(charSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "1b) Return all elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "1c) Return all non-empty elements:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "1d) Return all non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "1e) Split into only two elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "1f) Split into only two elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "1g) Split into only two non-empty elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "1h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Example 2: Split a string delimited by another string
printfn "2) Split a string delimited by another string:\n"

let s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  "
let stringSeparators = [| "[stop]" |]

printfn $"The original string is: \"{s2}\"."
printfn $"The delimiter string is: \"{stringSeparators[0]}\".\n"

// Split the string and return all elements
printfn "2a) Return all elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "2b) Return all elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "2c) Return all non-empty elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "2d) Return all non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "2e) Split into only two elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "2f) Split into only two elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "2g) Split into only two non-empty elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "2h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result

(*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*)

Public Shared Sub StringSplitOptionsExamples()
    ' This example demonstrates the String.Split() methods that use
    ' the StringSplitOptions enumeration.

    ' Example 1: Split a string delimited by characters
    Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)

    Dim s1 As String = ",ONE,, TWO,, , THREE,,"
    Dim charSeparators() As Char = {","c}
    Dim result() As String

    Console.WriteLine("The original string is: ""{0}"".", s1)
    Console.WriteLine("The delimiter character is: '{0}'." & vbCrLf, charSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("1a) Return all elements:")
    result = s1.Split(charSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("1b) Return all elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("1c) Return all non-empty elements:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("1e) Split into only two elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1f) Split into only two elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("1g) Split into only two non-empty elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Example 2: Split a string delimited by another string
    Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)

    Dim s2 As String = "[stop]" +
                "ONE[stop] [stop]" +
                "TWO  [stop][stop]  [stop]" +
                "THREE[stop][stop]  "
    Dim stringSeparators() As String = {"[stop]"}


    Console.WriteLine("The original string is: ""{0}"".", s2)
    Console.WriteLine("The delimiter string is: ""{0}""." & vbCrLf, stringSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("2a) Return all elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("2b) Return all elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("2c) Return all non-empty elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("2e) Split into only two elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2f) Split into only two elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("2g) Split into only two non-empty elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)

End Sub

' Display the array of separated strings.
Public Shared Sub Show(ByVal entries() As String)
    Console.WriteLine("The return value contains these {0} elements:", entries.Length)
    Dim entry As String
    For Each entry In entries
        Console.Write("<{0}>", entry)
    Next entry
    Console.Write(vbCrLf & vbCrLf)

End Sub

'This example produces the following results:
'
' 1) Split a string delimited by characters:
'
' The original string is: ",ONE,, TWO,, , THREE,,".
' The delimiter character is: ','.
'
' 1a) Return all elements:
' The return value contains these 9 elements:
' <><ONE><>< TWO><>< >< THREE><><>
'
' 1b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 1c) Return all non-empty elements:
' The return value contains these 4 elements:
' <ONE>< TWO>< >< THREE>
'
' 1d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 1e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< TWO,, , THREE,,>
'
' 1h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO,, , THREE,,>
'
' 2) Split a string delimited by another string:
'
' The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
' The delimiter string is: "[stop]".
'
' 2a) Return all elements:
' The return value contains these 9 elements:
' <><ONE>< ><TWO  ><><  ><THREE><><  >
'
' 2b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 2c) Return all non-empty elements:
' The return value contains these 6 elements:
' <ONE>< ><TWO  ><  ><THREE><  >
'
' 2d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 2e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>
'
' 2g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>
'

Comentários

Os caracteres delimitadores (os caracteres na matriz separator) não são incluídos nos elementos da matriz retornada. Por exemplo, se a matriz separator incluir o caractere "-" e o valor da instância de cadeia de caracteres atual for "aa-bb-cc", o método retornará uma matriz que contém três elementos: "aa", "bb" e "cc".

Se essa instância não contiver nenhum dos caracteres em separator, a matriz retornada consistirá em um único elemento que contenha essa instância.

Se o parâmetro options for RemoveEmptyEntries e o comprimento dessa instância for zero, o método retornará uma matriz vazia.

Cada elemento de separator define um delimitador separado que consiste em um único caractere. Se o argumento options for Nonee dois delimitadores forem adjacentes ou um delimitador for encontrado no início ou no final desta instância, o elemento de matriz correspondente conterá String.Empty. Por exemplo, se separator incluir dois elementos, '-' e '_', o valor da instância da cadeia de caracteres será "-_aa-_", e o valor do argumento options será None, o método retornará uma matriz de cadeia de caracteres com os cinco elementos a seguir:

1. String.Empty, que representa a cadeia de caracteres vazia que precede o caractere "-" no índice 0.

2. String.Empty, que representa a cadeia de caracteres vazia entre o caractere "-" no índice 0 e o caractere "_" no índice 1.

3. "aa".

4. String.Empty, que representa a cadeia de caracteres vazia que segue o caractere "-" no índice 4.

5. String.Empty, que representa a cadeia de caracteres vazia que segue o caractere "_" no índice 5.

A matriz do separador

Se o parâmetro separator for null ou não contiver caracteres, os caracteres de espaço em branco serão considerados delimitadores. Caracteres de espaço em branco são definidos pelo padrão Unicode e o método Char.IsWhiteSpace retorna true se forem passados para ele.

Para passar null para o parâmetro char[] separator, você deve indicar o tipo do null para desambiguar a chamada de algumas outras sobrecargas, como Split(String[], StringSplitOptions). O exemplo a seguir mostra várias maneiras de identificar de forma inequívoca essa sobrecarga.

string phrase = "The quick  brown fox";

_ = phrase.Split(default(char[]), StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split((char[]?)null, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split(null as char[], StringSplitOptions.RemoveEmptyEntries);

let phrase = "The quick  brown fox"

phrase.Split(Unchecked.defaultof<char[]>, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split(null :> char[], StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split((null: char[]), StringSplitOptions.RemoveEmptyEntries) |> ignore

Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, Char()),
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New Char() {},
                     StringSplitOptions.RemoveEmptyEntries)

Detalhes da comparação

O método Split extrai as subcadeias de caracteres nesta cadeia de caracteres delimitadas por um ou mais dos caracteres no parâmetro separator e retorna essas subcadeias de caracteres como elementos de uma matriz.

O método Split procura delimitadores executando comparações usando regras de classificação ordinais que diferenciam maiúsculas de minúsculas. Para obter mais informações sobre classificações de palavra, cadeia de caracteres e ordinais, consulte a enumeração System.Globalization.CompareOptions.

Considerações sobre desempenho

Os métodos Split alocam memória para o objeto de matriz retornado e um objeto String para cada elemento de matriz. Se o aplicativo exigir um desempenho ideal ou se o gerenciamento da alocação de memória for fundamental em seu aplicativo, considere usar o método IndexOf ou IndexOfAny e, opcionalmente, o método Compare, para localizar uma subcadeia de caracteres dentro de uma cadeia de caracteres.

Se você estiver dividindo uma cadeia de caracteres em um caractere separador, use o método IndexOf ou IndexOfAny para localizar um caractere separador na cadeia de caracteres. Se você estiver dividindo uma cadeia de caracteres em uma cadeia de caracteres separadora, use o método IndexOf ou IndexOfAny para localizar o primeiro caractere da cadeia de caracteres separador. Em seguida, use o método Compare para determinar se os caracteres após o primeiro caractere são iguais aos caracteres restantes da cadeia de caracteres do separador.

Além disso, se o mesmo conjunto de caracteres for usado para dividir cadeias de caracteres em várias chamadas de método Split, considere criar uma única matriz e referenciá-la em cada chamada de método. Isso reduz significativamente a sobrecarga adicional de cada chamada de método.

Notas aos Chamadores

No .NET Framework 3.5 e versões anteriores, se o método Split(Char[]) for passado por um separatornull ou não contiver caracteres, o método usará um conjunto ligeiramente diferente de caracteres de espaço em branco para dividir a cadeia de caracteres do que o método Trim(Char[]) faz para cortar a cadeia de caracteres. A partir do .NET Framework 4, ambos os métodos usam um conjunto idêntico de caracteres de espaço em branco Unicode.