using System;

using System.Collections.Generic;

​

namespace Spikes

{

    public interface IYourEntity

    {

        int Id { get; set; }

    }

​

    public class YourCustomer : IYourEntity

    {

        public int Id { get; set; }

        public string CustomerName { get; set; }

    }

​

    public class YourOrder : IYourEntity

    {

        public int Id { get; set; }

        public string OrderName { get; set; }

    }

​

    public class YourProduct : IYourEntity

    {

        public int Id { get; set; }

        public string ProductName { get; set; }

    }

​

    public interface IMyEntity

    {

        int Id { get; set; }

        string EntityName { get; set; }

    }

​

    public class MyEntity : IMyEntity

    {

        public int Id { get; set; }

        public string EntityName { get; set; }

    }

​

    public class MyProduct : IMyEntity

    {

        public int Id { get; set; }

        public string EntityName { get; set; }

        public DateTime CreatedOn { get; set; }

    }

​

    public static class Extensions

    {

        public static IMyEntity ToMyEntity(this IYourEntity target)

        {

             return new MyEntity { Id = target.Id, EntityName = "Fallback name" };

        }

​

        public static IMyEntity ToMyEntity(this YourOrder target)

        {

            return new MyEntity { Id = target.Id, EntityName = target.OrderName.ToUpper() };

        }

​

        public static IMyEntity ToMyEntity(this YourProduct target)

        {

            return new MyProduct { Id = target.Id * 100, EntityName = target.ProductName };

        }

​

        public static List<IMyEntity> ToMyEntities(this List<IYourEntity> target)

        {

            var myEntities  = new List<IMyEntity>();

​

            foreach (var yourEntity in target)

            {

                var myEntity = Extensions.ToMyEntity((dynamic)yourEntity);

                myEntities.Add(myEntity);

            }

​

            return myEntities;

        }

    }

​

    public class Program

    {

        public static void Main(string[] args)

        {

            var yourEntities = new List<IYourEntity>()

            {

                new YourCustomer() { Id = 1 },

                new YourOrder() { Id = 2, OrderName = "Order-2"},

                new YourProduct() { Id = 3, ProductName = "Product-3"}

             };

​

            var myEnties = yourEntities.ToMyEntities();

            myEnties.ForEach(o => Console.WriteLine("{0} - {1}  ({2})", 

                o.Id, o.EntityName, o.GetType().Name

            ));

        }

    }

}

​