StringCollection.Add(String) Método
Importante
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Adiciona uma cadeia de caracteres ao final do StringCollection.
public:
int Add(System::String ^ value);
public int Add (string value);
public int Add (string? value);
member this.Add : string -> int
Public Function Add (value As String) As Integer
- value
- String
A cadeia de caracteres a ser adicionada ao final do StringCollection. O valor pode ser null
.
O índice baseado em zero no qual o novo elemento será inserido.
O exemplo de código a seguir adiciona novos elementos ao StringCollection.
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
void PrintValues( IEnumerable^ myCol );
int main()
{
// Creates and initializes a new StringCollection.
StringCollection^ myCol = gcnew StringCollection;
Console::WriteLine( "Initial contents of the StringCollection:" );
PrintValues( myCol );
// Adds a range of elements from an array to the end of the StringCollection.
array<String^>^myArr = {"RED","orange","yellow","RED","green","blue","RED","indigo","violet","RED"};
myCol->AddRange( myArr );
Console::WriteLine( "After adding a range of elements:" );
PrintValues( myCol );
// Adds one element to the end of the StringCollection and inserts another at index 3.
myCol->Add( "* white" );
myCol->Insert( 3, "* gray" );
Console::WriteLine( "After adding \"* white\" to the end and inserting \"* gray\" at index 3:" );
PrintValues( myCol );
}
void PrintValues( IEnumerable^ myCol )
{
IEnumerator^ myEnum = myCol->GetEnumerator();
while ( myEnum->MoveNext() )
{
Object^ obj = safe_cast<Object^>(myEnum->Current);
Console::WriteLine( " {0}", obj );
}
Console::WriteLine();
}
/*
This code produces the following output.
Initial contents of the StringCollection:
After adding a range of elements:
RED
orange
yellow
RED
green
blue
RED
indigo
violet
RED
After adding "* white" to the end and inserting "* gray" at index 3:
RED
orange
yellow
* gray
RED
green
blue
RED
indigo
violet
RED
* white
*/
using System;
using System.Collections;
using System.Collections.Specialized;
public class SamplesStringCollection {
public static void Main() {
// Creates and initializes a new StringCollection.
StringCollection myCol = new StringCollection();
Console.WriteLine( "Initial contents of the StringCollection:" );
PrintValues( myCol );
// Adds a range of elements from an array to the end of the StringCollection.
String[] myArr = new String[] { "RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED" };
myCol.AddRange( myArr );
Console.WriteLine( "After adding a range of elements:" );
PrintValues( myCol );
// Adds one element to the end of the StringCollection and inserts another at index 3.
myCol.Add( "* white" );
myCol.Insert( 3, "* gray" );
Console.WriteLine( "After adding \"* white\" to the end and inserting \"* gray\" at index 3:" );
PrintValues( myCol );
}
public static void PrintValues( IEnumerable myCol ) {
foreach ( Object obj in myCol )
Console.WriteLine( " {0}", obj );
Console.WriteLine();
}
}
/*
This code produces the following output.
Initial contents of the StringCollection:
After adding a range of elements:
RED
orange
yellow
RED
green
blue
RED
indigo
violet
RED
After adding "* white" to the end and inserting "* gray" at index 3:
RED
orange
yellow
* gray
RED
green
blue
RED
indigo
violet
RED
* white
*/
Imports System.Collections
Imports System.Collections.Specialized
Public Class SamplesStringCollection
Public Shared Sub Main()
' Creates and initializes a new StringCollection.
Dim myCol As New StringCollection()
Console.WriteLine("Initial contents of the StringCollection:")
PrintValues(myCol)
' Adds a range of elements from an array to the end of the StringCollection.
Dim myArr() As [String] = {"RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED"}
myCol.AddRange(myArr)
Console.WriteLine("After adding a range of elements:")
PrintValues(myCol)
' Adds one element to the end of the StringCollection and inserts another at index 3.
myCol.Add("* white")
myCol.Insert(3, "* gray")
Console.WriteLine("After adding ""* white"" to the end and inserting ""* gray"" at index 3:")
PrintValues(myCol)
End Sub
Public Shared Sub PrintValues(myCol As IEnumerable)
Dim obj As [Object]
For Each obj In myCol
Console.WriteLine(" {0}", obj)
Next obj
Console.WriteLine()
End Sub
End Class
'This code produces the following output.
'
'Initial contents of the StringCollection:
'
'After adding a range of elements:
' RED
' orange
' yellow
' RED
' green
' blue
' RED
' indigo
' violet
' RED
'
'After adding "* white" to the end and inserting "* gray" at index 3:
' RED
' orange
' yellow
' * gray
' RED
' green
' blue
' RED
' indigo
' violet
' RED
' * white
'
StringCollection aceita null
como um valor válido e permite elementos duplicados.
Se Count for menor que a capacidade, esse método será uma operação O(1). Se a capacidade precisar ser aumentada para acomodar o novo elemento, esse método se tornará uma operação O(n
), em que n
é Count.
Produto | Versões |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
UWP | 10.0 |
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