using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Reflection;

using System.Collections.ObjectModel;

using System.Runtime.Serialization;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

using Debug = System.Console;

​

//https://stackoverflow.com/questions/62590805/add-custom-code-when-specific-type-is-deserialized

​

    public class ControlContractResolver : DefaultContractResolver

    {

        static readonly SerializationCallback callback = (o, context) =>

            {

                if (o is AddonUserControl auc)

                {

                    // Add your logic here:

                    Debug.WriteLine("AddonUserControl's OnDeserializedCallback called for {0}", auc);

                    // dm_addon dma = AddonManager.FindAddonDataByAUCAssembly(auc);

                    // SystemExtensions.SetRelativeWorkingDirectory("settings//" + dma.Path);                   

                    auc.AddonUserControlOnDeserializedCalled = true;

                }

            };

        protected override JsonContract CreateContract(Type objectType)

        {

            var contract = base.CreateContract(objectType);

            if (typeof(AddonUserControl).IsAssignableFrom(objectType))

            {

                contract.OnDeserializedCallbacks.Add(callback);

            }

            return contract;

        }

    }

​

    public class BaseControl

    {

    }

​

    public class AddonUserControl : BaseControl

    {

        [JsonIgnore]

        public bool AddonUserControlOnDeserializedCalled { get; set; }

        [OnDeserialized]

        private void OnDeserializedMethod(StreamingContext context)

        {

            AddonUserControlOnDeserializedCalled = true;

        }       

    }

​

    class TestClass

    {

        static IContractResolver myResolver = new ControlContractResolver 

        {

            // Set anything you might need here, e.g.

            //NamingStrategy = new CamelCaseNamingStrategy(),

        };

        public static void Test()

        {

            var control = new AddonUserControl();

​

            var settings = new JsonSerializerSettings

            {

                ContractResolver = myResolver,

                TypeNameHandling = TypeNameHandling.Auto, // Or TypeNameHandling.Objects or etc.

                // Other settings as required,

            };

            var json = JsonConvert.SerializeObject(control, typeof(object), settings); // Force type information for the root object

            Console.WriteLine(json);

            var control2 = JsonConvert.DeserializeObject<BaseControl>(json, settings);

            Assert.AreEqual(control.GetType(), control2.GetType());

            Assert.IsTrue(((AddonUserControl)control2).AddonUserControlOnDeserializedCalled);

        }   

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1})", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , GetNetCoreVersion());

            Console.WriteLine("{0} version: {1}", typeof(JsonSerializer).Assembly.GetName().Name,  typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

        public static string GetNetCoreVersion()

        {

            //https://techblog.dorogin.com/how-to-detect-net-core-version-in-runtime-ecd65ad695be

            //

            var assembly = typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly;

            var assemblyPath = assembly.CodeBase.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);

            int netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");

            if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)

                return assemblyPath[netCoreAppIndex + 1];

            return null;

        }

    }

​