String.Equality(String, String) Opérateur

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

Paramètres

Retours

true si la valeur de a est identique à la valeur de b; sinon, false.

Exemples

L’exemple suivant illustre l’opérateur d’égalité.

// 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
*)

Remarques

La Equality méthode définit l’opération de l’opérateur d’égalité pour la String classe. Il active le code tel que celui indiqué dans la section Exemple. L’opérateur appelle à son tour la méthode statique Equals(String, String) , qui effectue une comparaison ordinale (sensible à la casse et non sensible à la culture).