// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002497/object-tolongordefault

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        object val1 = 123;

        object val2 = "10986423210";

        object thisInvalid = "A100";

        string format = "{0, -20} {1, -15}";

        Console.WriteLine(format, "Object", "ToLongOrDefault");

        Console.WriteLine(format, "------", "---------------");

        // C# Extension Method: Object - ToLongOrDefault

        Console.WriteLine(format, val1, val1.ToLongOrDefault());

        Console.WriteLine(format, val2, val2.ToLongOrDefault());

        Console.WriteLine(format, thisInvalid, thisInvalid.ToLongOrDefault());

        Console.WriteLine(format, thisInvalid, thisInvalid.ToLongOrDefault(-1));

        Console.WriteLine(format, thisInvalid, thisInvalid.ToLongOrDefault(() => -2));

    }

}