using System;

using System.Diagnostics;

using System.Linq;

using System.Collections.Generic;

using Microsoft.Extensions.Caching.Memory;

using System.Collections.Concurrent;

​

public class Program

{

        public class TestMemory

        {

            public TestMemory()

            {

                SubItems = new List<SubItem>();

            }

            public List<SubItem> SubItems {get;set;}

        }

        public class SubItem

        {

            public string Name {get;set;}

            public int Id {get;set;}

        }

        public static void Main(string[] args)

        {

            var subItemModels = new ConcurrentDictionary<int, SubItem>();           

            var myCache = new MemoryCache(new MemoryCacheOptions());

            var subItem = new SubItem

            {

                Name = "SubItem A",

                Id = 1

            };

            subItemModels.AddOrUpdate(subItem.Id, subItem, (key, oldValue) => subItem);

            Console.WriteLine($"ConcurrentDictionary : {subItemModels.First().Value.Name}");            

            var mainObject = new TestMemory();

            mainObject.SubItems.Add(subItem);           

            Console.WriteLine($"Main Object : {mainObject.SubItems.First().Name}"); 

            Console.WriteLine($"Edit ConcurrentDictionary Object : {mainObject.SubItems.First().Name} -> SubItem B");   

            subItemModels.First().Value.Name = "SubItem B";

            Console.WriteLine($"Main Object  : {mainObject.SubItems.First().Name}");

            Console.WriteLine($"ConcurrentDictionary Object  : {subItemModels.First().Value.Name}");

​

        }

​

}