gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DerivedPropertyDemo
{
    class Program
    {
        internal class Service
        {
            public int ID { get; set; }
        }

        internal class RHService : Service
        {
            public string SomeOtherPropery { get; set; }
        }

        internal class VAService : Service
        {
            public string SomeOtherPropery { get; set; }
        }

        internal class Base
        {
            public List<Service> Services { get; set; }
        }

        internal class DerivedVA : Base
        {
            public List<VAService> Services { get; set; }
        }

        internal class DerivedRH : Base
        {
            public List<RHService> Services { get; set; }
        }

        public static void PrintWithBase(Base obj)
        {
            try
            {
                obj.Services.ForEach(x => Console.WriteLine("BaseObj: " + x.ID.ToString()));
            }
            catch (Exception e)
            {
                
                Console.WriteLine(e);
            }
            
        }

        static void Main(string[] args)
        {
            Base baseObj = new Base() {Services = new List<Service>() {new Service() {ID = 0}}};
            DerivedRH rhObj = new DerivedRH() { Services = new List<RHService>() { new RHService() { ID = 1 } } };
            DerivedVA vaObj = new DerivedVA() { Services = new List<VAService>() { new VAService() { ID = 2 } } };

            baseObj.Services.ForEach(x => Console.WriteLine("BaseObj: " + x.ID.ToString())); // 0
            rhObj.Services.ForEach(x => Console.WriteLine("RHService: " + x.ID.ToString())); // 1
            vaObj.Services.ForEach(x => Console.WriteLine("VAService: " + x.ID.ToString())); // 2
            
            PrintWithBase(baseObj);
            PrintWithBase(rhObj); // null, eftersom base.Services blir 'shadowed'
            PrintWithBase(vaObj); // null, eftersom base.Services blir 'shadowed'
        }
    }
}