using System.Collections.Generic;
public static void Main()
List<Lolli> list = new List<Lolli>() { new Lolli() { Lol = "asd" } };
List<ILol> ilist = list.Cast<ILol>().ToList();
Console.WriteLine(el.Lol);
public class Lolli : ILol {
public string Lol {get;set;}