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 Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

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

​

//https://stackoverflow.com/questions/62778772/jobject-jtoken-jproperty-get-teh-value-of-type

​

    public class RootObject

    {

    }

​

    class TestClass

    {

        public static void Test()

        {

            var settings = new JsonSerializerSettings

            {

                TypeNameHandling = TypeNameHandling.Objects

            };

            var root = new RootObject();

            var json = JsonConvert.SerializeObject(root, settings);

            Console.WriteLine(json);

            var jObject = JObject.Parse(json);

            var type = jObject["$type"];

            Console.WriteLine(type);

            var serializer = JsonSerializer.CreateDefault(settings);

​

            ReflectionUtils.SplitFullyQualifiedTypeName(type.ToString(), out var typeName, out var assemblyName);

            var returnedType = serializer.SerializationBinder.BindToType(assemblyName, typeName);

            Assert.AreEqual(root.GetType(), returnedType);

        }   

    }

​

    public static class ReflectionUtils

    {

        // Utilities taken from https://github.com/JamesNK/Newtonsoft.Json/blob/master/Src/Newtonsoft.Json/Utilities/ReflectionUtils.cs

        // I couldn't find a way to access these directly.

​

        public static void SplitFullyQualifiedTypeName(string fullyQualifiedTypeName, out string typeName, out string assemblyName)

        {

            int? assemblyDelimiterIndex = GetAssemblyDelimiterIndex(fullyQualifiedTypeName);

​

            if (assemblyDelimiterIndex != null)

            {

                typeName = fullyQualifiedTypeName.Substring(0, assemblyDelimiterIndex.GetValueOrDefault()).Trim();

                assemblyName = fullyQualifiedTypeName.Substring(assemblyDelimiterIndex.GetValueOrDefault() + 1, fullyQualifiedTypeName.Length - assemblyDelimiterIndex.GetValueOrDefault() - 1).Trim();

            }

            else

            {

                typeName = fullyQualifiedTypeName;

                assemblyName = null;

            }

        }

​

        private static int? GetAssemblyDelimiterIndex(string fullyQualifiedTypeName)

        {

            int scope = 0;

            for (int i = 0; i < fullyQualifiedTypeName.Length; i++)

            {

                char current = fullyQualifiedTypeName[i];

                switch (current)

                {

                    case '[':

                        scope++;

                        break;

                    case ']':

                        scope--;

                        break;

                    case ',':

                        if (scope == 0)

                        {

                            return i;

                        }

                        break;

                }

            }

​

            return null;

        }

    }

​

    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;

        }

    }

​