// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002511/object-tonullabledoubleordefault

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        object val1 = 123;

        object val2 = "1,033.67";

        object thisNull = null;

        object thisInvalid = "A100";

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

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

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

        // C# Extension Method: Object - ToNullableDoubleOrDefault

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

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

        Console.WriteLine(format, "null", thisNull.ToNullableDoubleOrDefault());

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

        Console.WriteLine(format, thisInvalid, thisInvalid.ToNullableDoubleOrDefault(0));

        Console.WriteLine(format, thisInvalid, thisInvalid.ToNullableDoubleOrDefault(() => 0));

    }

}