Guid.Equality Operator

Indicates whether the values of two specified Guid objects are equal.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Shared Operator = ( _
    a As Guid, _
    b As Guid _
) As Boolean
public static bool operator ==(
    Guid a,
    Guid b
)

Parameters

Return Value

Type: System.Boolean
true if a and b are equal; otherwise, false.

Examples

The following example uses the Equality operator to compare two GUID values with Guid.Empty to determine whether they consist exclusively of zeros.

Module Example
   Public Sub Demo(outputBlock As System.Windows.Controls.TextBlock)
      ' Create a GUID and determine whether it consists of all zeros.
      Dim guid1 As Guid = Guid.NewGuid
      outputBlock.Text += guid1.ToString() + vbCrLf
      outputBlock.Text += String.Format("Empty: {0}", guid1 = Guid.Empty) + vbCrLf
      outputBlock.Text += vbCrLf

      ' Create a GUID with all zeros and compare it to Empty.
      Dim bytes(15) As Byte
      Dim guid2 As New Guid(bytes)
      outputBlock.Text += guid2.ToString() + vbCrLf
      outputBlock.Text += String.Format("Empty: {0}", guid2 = Guid.Empty) + vbCrLf
   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
using System;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      // Create a GUID and determine whether it consists of all zeros.
      Guid guid1 = Guid.NewGuid();
      outputBlock.Text += guid1.ToString() + "\n";
      outputBlock.Text += String.Format("Empty: {0}\n\n", guid1 == Guid.Empty);

      // Create a GUID with all zeros and compare it to Empty.
      Byte[] bytes = new Byte[16];
      Guid guid2 = new Guid(bytes);
      outputBlock.Text += guid2.ToString() + "\n";
      outputBlock.Text += String.Format("Empty: {0}\n", guid2 == Guid.Empty);
   }
}
// The example displays output like the following:
//       11c43ee8-b9d3-4e51-b73f-bd9dda66e29c
//       Empty: False
//       
//       00000000-0000-0000-0000-000000000000
//       Empty: True

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

See Also

Reference