Guid.Empty Campo

Definição

Uma instância somente leitura da estrutura Guid cujo valor é zero.A read-only instance of the Guid structure whose value is all zeros.

public: static initonly Guid Empty;
public static readonly Guid Empty;
 staticval mutable Empty : Guid
Public Shared ReadOnly Empty As Guid 

Valor do campo

Guid

Comentários

Você pode comparar um GUID com o valor do Guid.Empty campo para determinar se um GUID é diferente de zero.You can compare a GUID with the value of the Guid.Empty field to determine whether a GUID is non-zero. O exemplo a seguir usa o Equality operador para comparar dois valores GUID com Guid.Empty para determinar se eles consistem exclusivamente de zeros.The following example uses the Equality operator to compare two GUID values with Guid.Empty to determine whether they consist exclusively of zeros.

// Create a GUID and determine whether it consists of all zeros.
Guid guid1 = Guid.NewGuid();
Console.WriteLine(guid1);
Console.WriteLine($"Empty: {guid1 == Guid.Empty}\n");

// Create a GUID with all zeros and compare it to Empty.
var bytes = new Byte[16];
var guid2 = new Guid(bytes);
Console.WriteLine(guid2);
Console.WriteLine($"Empty: {guid2 == Guid.Empty}");

// The example displays output like the following:
//       11c43ee8-b9d3-4e51-b73f-bd9dda66e29c
//       Empty: False
//
//       00000000-0000-0000-0000-000000000000
//       Empty: True
Module Example
   Public Sub Main()
      ' Create a GUID and determine whether it consists of all zeros.
      Dim guid1 As Guid = Guid.NewGuid
      Console.WriteLine(guid1)
      Console.WriteLine("Empty: {0}", guid1 = Guid.Empty)
      Console.WriteLine()
      
      ' Create a GUID with all zeros and compare it to Empty.
      Dim bytes(15) As Byte
      Dim guid2 As New Guid(bytes)
      Console.WriteLine(guid2)
      Console.WriteLine("Empty: {0}", guid2 = Guid.Empty)
   End Sub
End Module
' The example displays output like the following:
'       11c43ee8-b9d3-4e51-b73f-bd9dda66e29c
'       Empty: False
'       
'       00000000-0000-0000-0000-000000000000
'       Empty: True

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