Articolo
11/18/2011

UTF8Encoding.Equals Method

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

Determines whether the specified Object is equal to the current UTF8Encoding object.

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

Syntax

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

public override bool Equals(
    Object value
)

Parameters

value
Type: System.Object
The Object to compare with the current instance.

Return Value

Type: System.Boolean
true if value is an instance of UTF8Encoding and is equal to the current object; otherwise, false.

Remarks

Two UTF8Encoding objects are considered equal if all of the following conditions are true:

Both objects use the same byte order.
Both objects provide the byte order mark, or both do not.
Both objects throw an exception when encountering invalid encoding, or both do not.

Examples

The following example demonstrates how to use the Equals method to test whether the current UTF8Encoding object is equal to a different UTF8Encoding object. Four UTF8Encoding objects are created and compared and the results of the comparisons are displayed.

Imports System.Text

Class Example

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      Dim utf8 As New UTF8Encoding()
      Dim utf8true As New UTF8Encoding(True)
      Dim utf8truetrue As New UTF8Encoding(True, True)
      Dim utf8falsetrue As New UTF8Encoding(False, True)

      DescribeEquivalence(outputBlock, utf8.Equals(utf8))
      DescribeEquivalence(outputBlock, utf8.Equals(utf8true))
      DescribeEquivalence(outputBlock, utf8.Equals(utf8truetrue))
      DescribeEquivalence(outputBlock, utf8.Equals(utf8falsetrue))

      DescribeEquivalence(outputBlock, utf8true.Equals(utf8))
      DescribeEquivalence(outputBlock, utf8true.Equals(utf8true))
      DescribeEquivalence(outputBlock, utf8true.Equals(utf8truetrue))
      DescribeEquivalence(outputBlock, utf8true.Equals(utf8falsetrue))

      DescribeEquivalence(outputBlock, utf8truetrue.Equals(utf8))
      DescribeEquivalence(outputBlock, utf8truetrue.Equals(utf8true))
      DescribeEquivalence(outputBlock, utf8truetrue.Equals(utf8truetrue))
      DescribeEquivalence(outputBlock, utf8truetrue.Equals(utf8falsetrue))

      DescribeEquivalence(outputBlock, utf8falsetrue.Equals(utf8))
      DescribeEquivalence(outputBlock, utf8falsetrue.Equals(utf8true))
      DescribeEquivalence(outputBlock, utf8falsetrue.Equals(utf8truetrue))
      DescribeEquivalence(outputBlock, utf8falsetrue.Equals(utf8falsetrue))
   End Sub 'Main


   Public Shared Sub DescribeEquivalence(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal isEquivalent As Boolean)
      Dim phrase As String
      If isEquivalent Then
         phrase = "An"
      Else
         phrase = "Not an"
      End If
      outputBlock.Text += String.Format("{0} equivalent encoding.", phrase) & vbCrLf
   End Sub 'DescribeEquivalence
End Class 'UTF8EncodingExample

using System;
using System.Text;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      UTF8Encoding utf8 = new UTF8Encoding();
      UTF8Encoding utf8true = new UTF8Encoding(true);
      UTF8Encoding utf8truetrue = new UTF8Encoding(true, true);
      UTF8Encoding utf8falsetrue = new UTF8Encoding(false, true);

      DescribeEquivalence(outputBlock, utf8.Equals(utf8));
      DescribeEquivalence(outputBlock, utf8.Equals(utf8true));
      DescribeEquivalence(outputBlock, utf8.Equals(utf8truetrue));
      DescribeEquivalence(outputBlock, utf8.Equals(utf8falsetrue));

      DescribeEquivalence(outputBlock, utf8true.Equals(utf8));
      DescribeEquivalence(outputBlock, utf8true.Equals(utf8true));
      DescribeEquivalence(outputBlock, utf8true.Equals(utf8truetrue));
      DescribeEquivalence(outputBlock, utf8true.Equals(utf8falsetrue));

      DescribeEquivalence(outputBlock, utf8truetrue.Equals(utf8));
      DescribeEquivalence(outputBlock, utf8truetrue.Equals(utf8true));
      DescribeEquivalence(outputBlock, utf8truetrue.Equals(utf8truetrue));
      DescribeEquivalence(outputBlock, utf8truetrue.Equals(utf8falsetrue));

      DescribeEquivalence(outputBlock, utf8falsetrue.Equals(utf8));
      DescribeEquivalence(outputBlock, utf8falsetrue.Equals(utf8true));
      DescribeEquivalence(outputBlock, utf8falsetrue.Equals(utf8truetrue));
      DescribeEquivalence(outputBlock, utf8falsetrue.Equals(utf8falsetrue));
   }

   public static void DescribeEquivalence(System.Windows.Controls.TextBlock outputBlock, Boolean isEquivalent)
   {
      outputBlock.Text += String.Format(
          "{0} equivalent encoding.", (isEquivalent ? "An" : "Not an")
      ) + "\n";
   }
}

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.

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