Makale
11/18/2011

Tuple<T1, T2>.Equals Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Returns a value that indicates whether the current Tuple<T1, T2> object is equal to a specified object.

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

Syntax

'Declaration
Public Overrides Function Equals ( _
    obj As Object _
) As Boolean

public override bool Equals(
    Object obj
)

Parameters

obj
Type: System.Object
The object to compare with this instance.

Return Value

Type: System.Boolean
true if the current instance is equal to the specified object; otherwise, false.

Remarks

The obj parameter is considered to be equal to the current instance under the following conditions:

It is a Tuple<T1, T2> object.
Its two components are of the same types as the current instance.
Its two components have the same values as those of the current instance.

Examples

The following example calls the Tuple<T1, T2>.Equals(Object) method to determine whether any of the objects in an array of Tuple<T1, T2> objects are equal to one another. The output reflects the fact that the Equals(Object) method returns true when comparing Tuple<T1, T2> objects whose components have equal values.

Module Example
   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim scores() As Tuple(Of String, Nullable(Of Integer)) = _ 
                      { New Tuple(Of String, Nullable(Of Integer))("Dan", 90), _
                        New Tuple(Of String, Nullable(Of Integer))("Ernie", Nothing), _
                        New Tuple(Of String, Nullable(Of Integer))("Jill", 88), _      
                        New Tuple(Of String, Nullable(Of Integer))("Ernie", Nothing), _ 
                        New Tuple(Of String, Nullable(Of Integer))("Nancy", 88), _ 
                        New Tuple(Of String, Nullable(Of Integer))("Dan", 90) }

      ' Compare the Tuple objects
      For ctr As Integer = 0 To scores.Length - 1
         Dim currentTuple As Tuple(Of String, Nullable(Of Integer)) = scores(ctr)
         For innerCtr As Integer = ctr + 1 To scores.Length - 1
            outputBlock.Text += String.Format("{0} = {1}: {2}", _
                              scores(ctr), scores(innerCtr), _ 
                              scores(ctr).Equals(scores(innerCtr))) + vbCrLf
         Next
         outputBlock.Text &= vbCrLf
      Next
   End Sub
End Module
' The example displays the following output:
'       (Dan, 90) = (Ernie, ): False
'       (Dan, 90) = (Jill, 88): False
'       (Dan, 90) = (Ernie, ): False
'       (Dan, 90) = (Nancy, 88): False
'       (Dan, 90) = (Dan, 90): True
'       
'       (Ernie, ) = (Jill, 88): False
'       (Ernie, ) = (Ernie, ): True
'       (Ernie, ) = (Nancy, 88): False
'       (Ernie, ) = (Dan, 90): False
'       
'       (Jill, 88) = (Ernie, ): False
'       (Jill, 88) = (Nancy, 88): False
'       (Jill, 88) = (Dan, 90): False
'       
'       (Ernie, ) = (Nancy, 88): False
'       (Ernie, ) = (Dan, 90): False
'       
'       (Nancy, 88) = (Dan, 90): False

using System;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      Tuple<string, Nullable<int>>[] scores = 
                      { new Tuple<string, Nullable<int>>("Dan", 90),
                        new Tuple<string, Nullable<int>>("Ernie", null),
                        new Tuple<string, Nullable<int>>("Jill", 88),
                        new Tuple<string, Nullable<int>>("Ernie", null), 
                        new Tuple<string, Nullable<int>>("Nancy", 88), 
                        new Tuple<string, Nullable<int>>("Dan", 90) };

      // Compare the Tuple objects
      for (int ctr = 0; ctr < scores.Length; ctr++)
      {
         Tuple<string, Nullable<int>> currentTuple = scores[ctr];
         for (int innerCtr = ctr + 1; innerCtr < scores.Length; innerCtr++)
         {
            outputBlock.Text += String.Format("{0} = {1}: {2}",
                              scores[ctr], scores[innerCtr],
                              scores[ctr].Equals(scores[innerCtr])) + "\n";
         }
         outputBlock.Text += "\n";
      }
   }
}
// The example displays the following output:
//       (Dan, 90) = (Ernie, ): False
//       (Dan, 90) = (Jill, 88): False
//       (Dan, 90) = (Ernie, ): False
//       (Dan, 90) = (Nancy, 88): False
//       (Dan, 90) = (Dan, 90): True
//       
//       (Ernie, ) = (Jill, 88): False
//       (Ernie, ) = (Ernie, ): True
//       (Ernie, ) = (Nancy, 88): False
//       (Ernie, ) = (Dan, 90): False
//       
//       (Jill, 88) = (Ernie, ): False
//       (Jill, 88) = (Nancy, 88): False
//       (Jill, 88) = (Dan, 90): False
//       
//       (Ernie, ) = (Nancy, 88): False
//       (Ernie, ) = (Dan, 90): False
//       
//       (Nancy, 88) = (Dan, 90): False

Version Information

Silverlight

Supported in: 5, 4

Platforms

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

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