Guid.TryParseExact Método

Source:

Guid.cs

Source:

Guid.cs

Source:

Guid.cs

public:
 static bool TryParseExact(ReadOnlySpan<char> input, ReadOnlySpan<char> format, [Runtime::InteropServices::Out] Guid % result);

public static bool TryParseExact (ReadOnlySpan<char> input, ReadOnlySpan<char> format, out Guid result);

static member TryParseExact : ReadOnlySpan<char> * ReadOnlySpan<char> * Guid -> bool

Public Shared Function TryParseExact (input As ReadOnlySpan(Of Char), format As ReadOnlySpan(Of Char), ByRef result As Guid) As Boolean

Parámetros

Devoluciones

Es true si la operación de análisis se realizó correctamente; de lo contrario, es false.

Source:

Guid.cs

Source:

Guid.cs

Source:

Guid.cs

public:
 static bool TryParseExact(System::String ^ input, System::String ^ format, [Runtime::InteropServices::Out] Guid % result);

public static bool TryParseExact (string input, string format, out Guid result);

public static bool TryParseExact (string? input, string? format, out Guid result);

static member TryParseExact : string * string * Guid -> bool

Public Shared Function TryParseExact (input As String, format As String, ByRef result As Guid) As Boolean

Parámetros

Devoluciones

Es true si la operación de análisis se realizó correctamente; de lo contrario, es false.

Ejemplos

En el ejemplo siguiente se llama al ToString(String) método con cada uno de los especificadores de formato admitidos para generar una matriz de cadenas que representan un único GUID. A continuación, se pasan al TryParseExact método , que analiza correctamente la cadena que se ajusta al especificador de formato "B".

// Define an array of all format specifiers.
string[] formats = { "N", "D", "B", "P", "X" };
Guid guid = Guid.NewGuid();
// Create an array of valid Guid string representations.
var stringGuids = new string[formats.Length];
for (int ctr = 0; ctr < formats.Length; ctr++)
    stringGuids[ctr] = guid.ToString(formats[ctr]);

// Parse the strings in the array using the "B" format specifier.
foreach (var stringGuid in stringGuids)
{
    if (Guid.TryParseExact(stringGuid, "B", out var newGuid))
        Console.WriteLine($"Successfully parsed {stringGuid}");
    else
        Console.WriteLine($"Unable to parse '{stringGuid}'");
}

// The example displays output similar to the following:
//
//    Unable to parse 'c0fb150f6bf344df984a3a0611ae5e4a'
//    Unable to parse 'c0fb150f-6bf3-44df-984a-3a0611ae5e4a'
//    Successfully parsed {c0fb150f-6bf3-44df-984a-3a0611ae5e4a}
//    Unable to parse '(c0fb150f-6bf3-44df-984a-3a0611ae5e4a)'
//    Unable to parse '{0xc0fb150f,0x6bf3,0x44df,{0x98,0x4a,0x3a,0x06,0x11,0xae,0x5e,0x4a}}'

open System

// Define an array of all format specifiers.
let formats = [| "N"; "D"; "B"; "P"; "X" |]

let guid = Guid.NewGuid()

// Create an array of valid Guid string representations.
let stringGuids = 
    Array.map guid.ToString formats

// Parse the strings in the array using the "B" format specifier.
for stringGuid in stringGuids do
    match Guid.TryParseExact(stringGuid, "B") with
    | true, newGuid ->
        printfn $"Successfully parsed {stringGuid}"
    | _ ->
        printfn $"Unable to parse '{stringGuid}'"

// The example displays output similar to the following:
//
//    Unable to parse 'c0fb150f6bf344df984a3a0611ae5e4a'
//    Unable to parse 'c0fb150f-6bf3-44df-984a-3a0611ae5e4a'
//    Successfully parsed {c0fb150f-6bf3-44df-984a-3a0611ae5e4a}
//    Unable to parse '(c0fb150f-6bf3-44df-984a-3a0611ae5e4a)'
//    Unable to parse '{0xc0fb150f,0x6bf3,0x44df,{0x98,0x4a,0x3a,0x06,0x11,0xae,0x5e,0x4a}}'

Module Example
   Public Sub Main()
      ' Define an array of all format specifiers.
      Dim formats() As String = { "N", "D", "B", "P", "X" }
      Dim guid As Guid = Guid.NewGuid()
      ' Create an array of valid Guid string representations.
      Dim stringGuids(formats.Length - 1) As String
      For ctr As Integer = 0 To formats.Length - 1
         stringGuids(ctr) = guid.ToString(formats(ctr))
      Next

      ' Try to parse the strings in the array using the "B" format specifier.
      For Each stringGuid In stringGuids
         Dim newGuid As Guid
         If Guid.TryParseExact(stringGuid, "B", newGuid) Then
            Console.WriteLine("Successfully parsed {0}", stringGuid)
         Else
            Console.WriteLine("Unable to parse '{0}'", stringGuid)
         End If   
      Next      
   End Sub
End Module
' The example displays the following output:
'    Unable to parse 'c0fb150f6bf344df984a3a0611ae5e4a'
'    Unable to parse 'c0fb150f-6bf3-44df-984a-3a0611ae5e4a'
'    Successfully parsed {c0fb150f-6bf3-44df-984a-3a0611ae5e4a}
'    Unable to parse '(c0fb150f-6bf3-44df-984a-3a0611ae5e4a)'
'    Unable to parse '{0xc0fb150f,0x6bf3,0x44df,{0x98,0x4a,0x3a,0x06,0x11,0xae,0x5e,0x4a}}'

Comentarios

Este método requiere que la cadena se convierta exactamente en el formato especificado por el format parámetro , después de quitar los caracteres de espacio en blanco iniciales y finales. Devuelve false si input es null o no está en el formato especificado por formaty no produce una excepción.

En la tabla siguiente se muestran los especificadores de formato aceptados para el format parámetro . "0" representa un dígito; Los guiones ("-"), las llaves ("{", "}") y los paréntesis ("(", ")") aparecen como se muestra.

Consulte también

• ParseExact(String, String)