using System;

using System.IO;

using AutoMapper;

using System.Collections.Generic;

​

namespace Example

{

    public class OrderLine

    {

    }

    public class OrderLineDTO

    {

    }

    public class DescriptionAttribute : Attribute

    {

        private readonly string _description;

        public DescriptionAttribute(string description)

        {

            _description = description;

        }

        public string Description

        {

            get

            {

                return _description;

            }

        }

    }

    public enum OrderStatus

    {

        [Description("Paid")]

        Paid,

        [Description("Processing")]

        InProcess,

        [Description("Delivered")]

        Sent

    }

​

    public static class ExtensionMethods

    {

        static public string GetDescription(this OrderStatus This)

        {

            var type = typeof(OrderStatus);

            var memInfo = type.GetMember(This.ToString());

            var attributes = memInfo[0].GetCustomAttributes(typeof(DescriptionAttribute), false);

            return ((DescriptionAttribute)attributes[0]).Description;

        }

    }

​

    public class Order {

        public int Id { get; set; }

        public List<OrderLine> OrderLines { get; set; }

        public OrderStatus Status { get; set; }

    }

    public class OrderDTO {

        public int Id { get; set; }

        public List<OrderLineDTO> OrderLines { get; set; }

        public string Status { get; set; }  

    }

    public class Program

    {

        static public void Main()

        {

            Mapper.Initialize

            (

                cfg => 

                {

                    cfg.CreateMap<Order, OrderDTO>()

                    .ForMember

                    (

                        dest => dest.Status,

                        opt => opt.MapFrom

                        (

                            src => src.Status.GetDescription()

                        )

                    );

                }

            );

            var o = new Order();

            o.Status = OrderStatus.Sent;

            var dto = Mapper.Map<OrderDTO>(o);

            Console.WriteLine(dto.Status);

        }

    }

}