using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<A> listA = new List<A>();

        listA.Add(new A { Id = 1, Email = "maria@email.com", Role = "User" });

        listA.Add(new A { Id = 2, Email = "joao@email.com", Role = "Admin" });

​

        //Convertendo B para A

        List<B> listB = listA.Select(a => (B)a).ToList();

​

        Console.WriteLine("Os itens da listA foram copiados para listB");

​

        Console.WriteLine("Itens da lista A: ");

        foreach (var item in listA)

        {

            Console.WriteLine(string.Format("Id {0} - E-mail: {1} - Role {2}", item.Id, item.Email, item.Role));

        }

​

        Console.WriteLine("Itens da lista B: ");

        foreach (var item in listB)

        {

            Console.WriteLine(string.Format("Id {0} - E-mail: {1} - Role {2}", item.id_b, item.prop_b1, item.prop_b2));

        }

​

        Console.ReadLine();

    }

    public class A

    {

        public int Id { get; set; }

        public string Role { get; set; }

        public string Email { get; set; }

​

        public static explicit operator A(B b)

        {

            return new A

            {

                Id = b.id_b,

                Role = b.prop_b1,

                Email = b.prop_b2

            };

        }

    }

​

    public class B

    {

        public int id_b { get; set; }

        public string prop_b1 { get; set; }

        public string prop_b2 { get; set; }

​

        public static explicit operator B(A a)

        {

            return new B

            {

                id_b = a.Id,

                prop_b1 = a.Role,

                prop_b2 = a.Email

            };

        }

    }

}

​