String.Equality(String, String) 操作员

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

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

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

static member ( = ) : string * string -> bool

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

参数

返回

true 如果值 a 与值 b相同，则为 ;否则为 false。

示例

下面的示例演示相等运算符。

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

class EqualityOp 
{
    public static void Main() 
    {
        Console.WriteLine( 
            "This example of the String Equality 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 Equality operator 
generates the following output.

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

// Example for the String Equality operator.
printfn "This example of the String Equality 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 Equality operator 
generates the following output.

"abcd" == "ijkl" ?  False
"abcd" == "ABCD" ?  False
"abcd" == "abcd" ?  True
*)

注解

该方法 Equality 定义类的相等运算符 String 的操作。 它启用如“示例”部分中显示的代码。 运算符又调用静态 Equals(String, String) 方法，该方法执行序号（区分大小写和不区分区域性）比较。