// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002534/object-tonullableuint64

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        object[] values = { true, null, -12, 163, 935, 'x', new DateTime(2009, 5, 12),

                "104", "103.0", "-1",

                "1.00e2", "One", 1.00e2, 16.3e42};

        ulong? result;

​

        foreach (object value in values)

        {

            try

            {

                //C# Extension Method: Object - ToNullableUInt64

                result = value.ToNullableUInt64();

                Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",

                                  value == null ? "null" : value.GetType().Name,

                                  value == null ? "null" : value,

                                  result == null ? "null" : result.GetType().Name,

                                  result == null ? "null" : result.ToString());

            }

            catch (OverflowException)

            {

                Console.WriteLine("The {0} value {1} is outside the range of the long type.",

                                  value == null ? "null" : value.GetType().Name, value);

            }

            catch (FormatException)

            {

                Console.WriteLine("The {0} value {1} is not in a recognizable format.",

                                  value == null ? "null" : value.GetType().Name, value);

            }

            catch (InvalidCastException)

            {

                Console.WriteLine("No conversion to an long exists for the {0} value {1}.",

                                  value == null ? "null" : value.GetType().Name, value);

​

            }

        }

    }

}