String.Inequality(String, String) 運算子

定義

命名空間:

System

組件:

netstandard.dll, System.Runtime.dll

來源:

String.Comparison.cs

判斷兩個指定字串的值是否不同。

public:
 static bool operator !=(System::String ^ a, System::String ^ b);

public static bool operator !=(string? a, string? b);

static member op_Inequality : string * string -> bool

Public Shared Operator != (a As String, b As String) As Boolean

參數

a

String

第一個比較的字串，或 null。

b

String

第二串比較，或 null。

傳回

Boolean

true 若 的 a 值與 的 b值不同;否則， false。

範例

以下範例展示了不等式算子。

// 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.
printfn "This example of the String Inequality operator\ngenerates the following output.\n"

let compareAndDisplay comparand =
    let lower = "abcd"
    printfn $"\"%s{lower}\" <> \"%s{comparand}\" ?  {lower <> comparand}"

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
*)

備註

此 Inequality 方法定義了該 String 類別不等式算子的操作。 它能啟用範例部分所示的程式碼。

運算子 Inequality 接著呼叫靜態 Equals(String, String) 方法，執行序數比較（大小寫區分且不依賴培養）。

Note

Visual Basic編譯器不會將不等式運算子解析為呼叫 Inequality 方法。 相反地，不等式運算子會將呼叫包裹到該 Operators.CompareString 方法。