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String.Inequality Operator

April 12, 2014

Determines whether two specified String objects have different values.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
public static bool operator !=(
	string a,
	string b
)

Parameters

a
Type: System.String
The first string to compare, or null.
b
Type: System.String
The second string to compare, or null.

Return Value

Type: System.Boolean
true if the value of a is different from the value of b; otherwise, false.

The Inequality method defines the operation of the inequality operator for the String class.

This operator is implemented using the Equals method, which means the comparands are tested for a combination of reference and value equality. This operator performs an ordinal comparison.

The following code example demonstrates the inequality operator.


// Example for the String Inequality operator.
using System;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      outputBlock.Text +=
          "This example of the String Inequality operator\n" +
          "generates the following output.\n" + "\n";

      CompareAndDisplay(outputBlock, "ijkl");
      CompareAndDisplay(outputBlock, "ABCD");
      CompareAndDisplay(outputBlock, "abcd");
   }

   static void CompareAndDisplay(System.Windows.Controls.TextBlock outputBlock, String Comparand)
   {
      String Lower = "abcd";

      outputBlock.Text += String.Format(
          "\"{0}\" != \"{1}\" ?  {2}",
          Lower, Comparand, Lower != Comparand) + "\n";
   }
}

/*
This example of the String Inequality operator
generates the following output.

"abcd" != "ijkl" ?  True
"abcd" != "ABCD" ?  True
"abcd" != "abcd" ?  False
*/


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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