// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002514/object-tonullableguid

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        object[] values = { true, null, 'a', 123, 1.764e32, "9.78", "1e-02",

                               1.67e03, "A100", "1,033.67", DateTime.Now, Double.MaxValue, 

                               "ca761232ed4211cebacd00aa0057b223",

                               "CA761232-ED42-11CE-BACD-00AA0057B223", 

                               "{CA761232-ED42-11CE-BACD-00AA0057B223}", 

                               "(CA761232-ED42-11CE-BACD-00AA0057B223)", 

                               "{0xCA761232, 0xED42, 0x11CE, {0xBA, 0xCD, 0x00, 0xAA, 0x00, 0x57, 0xB2, 0x23}}"

                          };

        foreach (object value in values)

        {

            try

            {

                //C# Extension Method: Object - ToNullableGuid

                Guid? result = value.ToNullableGuid();

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

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

                                  value == null ? "null" : value, 

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

            }

            catch (FormatException)

            {

                Console.WriteLine("The {0} value {1} is not recognized as a valid Guid value.",

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

            }

            catch (InvalidCastException)

            {

                Console.WriteLine("Conversion of the {0} value {1} to a Guid is not supported.",

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

            }

        }

    }

}