Guid.TryParse Metodo

Origine:

Guid.cs

Origine:

Guid.cs

Origine:

Guid.cs

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

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

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

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

Parametri

Restituisce

true se l'operazione di analisi ha avuto esito positivo; in caso contrario, false.

Origine:

Guid.cs

Origine:

Guid.cs

Origine:

Guid.cs

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

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

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

static member TryParse : string * Guid -> bool

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

Parametri

Restituisce

true se l'operazione di analisi ha avuto esito positivo; in caso contrario, false.

Esempio

L'esempio seguente crea un nuovo GUID, lo converte in tre rappresentazioni di stringa separate chiamando il metodo ToString(String) con gli identificatori di formato "B", "D" e "X" e quindi chiama il metodo TryParse per convertire le stringhe in valori Guid.

Guid originalGuid = Guid.NewGuid();
// Create an array of string representations of the GUID.
string[] stringGuids = { originalGuid.ToString("B"),
                         originalGuid.ToString("D"),
                         originalGuid.ToString("X") };

// Parse each string representation.
foreach (var stringGuid in stringGuids)
{
    if (Guid.TryParse(stringGuid, out var newGuid))
        Console.WriteLine($"Converted {stringGuid} to a Guid");
    else
        Console.WriteLine($"Unable to convert {stringGuid} to a Guid");
}

// The example displays output similar to the following:
//
//    Converted {81a130d2-502f-4cf1-a376-63edeb000e9f} to a Guid
//    Converted 81a130d2-502f-4cf1-a376-63edeb000e9f to a Guid
//    Converted {0x81a130d2,0x502f,0x4cf1,{0xa3,0x76,0x63,0xed,0xeb,0x00,0x0e,0x9f}} to a Guid

open System

let originalGuid = Guid.NewGuid()

// Create an array of string representations of the GUID.
let stringGuids =
    [| originalGuid.ToString "B"
       originalGuid.ToString "D"
       originalGuid.ToString "X" |]

// Parse each string representation.
for stringGuid in stringGuids do
    match Guid.TryParse stringGuid with
    | true, newGuid ->
        printfn $"Converted {stringGuid} to a Guid"
    | _ ->
        printfn $"Unable to convert {stringGuid} to a Guid"

// The example displays output similar to the following:
//
//    Converted {81a130d2-502f-4cf1-a376-63edeb000e9f} to a Guid
//    Converted 81a130d2-502f-4cf1-a376-63edeb000e9f to a Guid
//    Converted {0x81a130d2,0x502f,0x4cf1,{0xa3,0x76,0x63,0xed,0xeb,0x00,0x0e,0x9f}} to a Guid

Module Example
   Public Sub Main()
      Dim originalGuid As Guid = Guid.NewGuid()
      ' Create an array of string representations of the GUID.
      Dim stringGuids() As String = { originalGuid.ToString("B"),
                                      originalGuid.ToString("D"),
                                      originalGuid.ToString("X") }
      
      ' Parse each string representation.
      Dim newGuid As Guid
      For Each stringGuid In stringGuids
         If Guid.TryParse(stringGuid, newGuid) Then
            Console.WriteLine("Converted {0} to a Guid", stringGuid)
         Else
            Console.WriteLine("Unable to convert {0} to a Guid", 
                              stringGuid)
         End If     
      Next                                      
   End Sub
End Module
' The example displays the following output:
'    Converted {81a130d2-502f-4cf1-a376-63edeb000e9f} to a Guid
'    Converted 81a130d2-502f-4cf1-a376-63edeb000e9f to a Guid
'    Converted {0x81a130d2,0x502f,0x4cf1,{0xa3,0x76,0x63,0xed,0xeb,0x00,0x0e,0x9f}} to a Guid

Commenti

Questo metodo è simile al metodo Parse, ad eccezione del fatto che anziché restituire il GUID analizzato, restituisce false se input è null o meno in un formato riconosciuto e non genera un'eccezione. Elimina qualsiasi spazio vuoto iniziale o finale da input e converte le stringhe in uno dei cinque formati riconosciuti dai metodi ToString(String) e ToString(String, IFormatProvider), come illustrato nella tabella seguente.

Vedi anche

• Parse(String)

Origine:

Guid.cs

Origine:

Guid.cs

Origine:

Guid.cs

public:
 static bool TryParse(ReadOnlySpan<char> s, IFormatProvider ^ provider, [Runtime::InteropServices::Out] Guid % result) = ISpanParsable<Guid>::TryParse;

public static bool TryParse (ReadOnlySpan<char> s, IFormatProvider? provider, out Guid result);

static member TryParse : ReadOnlySpan<char> * IFormatProvider * Guid -> bool

Public Shared Function TryParse (s As ReadOnlySpan(Of Char), provider As IFormatProvider, ByRef result As Guid) As Boolean

Parametri

Restituisce

true se s è stato analizzato correttamente; in caso contrario, false.

Origine:

Guid.cs

Origine:

Guid.cs

Origine:

Guid.cs

public:
 static bool TryParse(System::String ^ s, IFormatProvider ^ provider, [Runtime::InteropServices::Out] Guid % result) = IParsable<Guid>::TryParse;

public static bool TryParse (string? s, IFormatProvider? provider, out Guid result);

static member TryParse : string * IFormatProvider * Guid -> bool

Public Shared Function TryParse (s As String, provider As IFormatProvider, ByRef result As Guid) As Boolean

Parametri

Restituisce

true se s è stato analizzato correttamente; in caso contrario, false.