// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002566/object-nullifequalsany

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        object @this = "1";

​

        // C# Extension Method: Object - NullIfEqualsAny

        object result1 = @this.NullIfEqualsAny("0", "1", "2"); // return null;

        object result2 = @this.NullIfEqualsAny("2"); // return "1";

​

        Console.WriteLine(result1);

        Console.WriteLine(result2);

    }

}