Guid.Empty Bidang

Definisi

Ruang nama:

System

Rakitan:

System.Runtime.dll

Sumber:

Guid.cs

Instans baca-saja dari Guid struktur yang nilainya semua nol.

public: static initonly Guid Empty;

public static readonly Guid Empty;

 staticval mutable Empty : Guid

Public Shared ReadOnly Empty As Guid 

Nilai Bidang

Guid

Keterangan

Anda dapat membandingkan GUID dengan nilai Guid.Empty bidang untuk menentukan apakah GUID bukan nol. Contoh berikut menggunakan Equality operator untuk membandingkan dua nilai GUID dengan Guid.Empty untuk menentukan apakah nilai tersebut secara eksklusif terdiri dari nol.

// 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

open System

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

// Create a GUID with all zeros and compare it to Empty.
let bytes = Array.zeroCreate<byte> 16
let guid2 = Guid bytes
printfn $"{guid2}"
printfn $"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