StringInequality Operator 
 

Determines whether two specified strings have different values.

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

public static bool operator !=(
	string a,
	string b
)
public:
static bool operator !=(
	String^ a,
	String^ b
)
static let inline (<>)
        a:string *
        b:string : bool
Public Shared Operator <> (
	a As String,
	b As String
) As Boolean

Parameters

a
Type:

The first string to compare, or null.

b
Type:

The second string to compare, or null.

Return Value

Type:

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. It enables code such as that shown in the Examples section.

The Inequality operator in turn calls the static Equals method, which performs an ordinal (case-sensitive and culture-insensitive) comparison.

System_CAPS_noteNote

   The Visual Basic compiler does not resolve the inequality operator as a call to the Inequality method. Instead, the inequality operator wraps a call to the OperatorsCompareString method.

The following example demonstrates the inequality operator.

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

class InequalityOp 
{
    public static void Main() 
    {
        Console.WriteLine( 
            "This example of the String Inequality operator\n" +
            "generates the following output.\n" );

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

    static void CompareAndDisplay( String Comparand )
    {
        String  Lower = "abcd";

        Console.WriteLine( 
            "\"{0}\" != \"{1}\" ?  {2}",
            Lower, Comparand, Lower != Comparand );
    }
}

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

"abcd" != "ijkl" ?  True
"abcd" != "ABCD" ?  True
"abcd" != "abcd" ?  False
*/
// Example for the String Inequality operator.
using namespace System;
void CompareAndDisplay( String^ Comparand )
{
   String^ Lower = "abcd";
   Console::WriteLine( "\"{0}\" != \"{1}\" ?  {2}", Lower, Comparand, Lower != Comparand );
}

int main()
{
   Console::WriteLine( "This example of the String Inequality operator\n"
   "generates the following output.\n" );
   CompareAndDisplay( "ijkl" );
   CompareAndDisplay( "ABCD" );
   CompareAndDisplay( "abcd" );
}

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

"abcd" != "ijkl" ?  True
"abcd" != "ABCD" ?  True
"abcd" != "abcd" ?  False
*/
Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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