using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Reflection;

using System.Runtime.Serialization;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using Microsoft.VisualStudio.TestTools.UnitTesting;

​

//https://stackoverflow.com/questions/68260458/c-sharp-convert-assertfailedexception-jtoken-to-exception-object

​

    // PreferISerializableContractResolver copied from this answer https://stackoverflow.com/a/50881884/3744182

    // By https://stackoverflow.com/users/3744182/dbc

    // To https://stackoverflow.com/questions/50845255/deserializing-custom-exceptions-in-newtonsoft-json

    public class PreferISerializableContractResolver : DefaultContractResolver

    {

        protected override JsonContract CreateContract(Type objectType)

        {

            var contract = base.CreateContract(objectType);

​

            if (!IgnoreSerializableInterface

                && contract is JsonObjectContract

                && typeof(ISerializable).IsAssignableFrom(objectType)

                && !objectType.GetCustomAttributes(true).OfType<JsonContainerAttribute>().Any())

            {

                contract = CreateISerializableContract(objectType);

            }

​

            return contract;

        }

    }

​

    public class TestClass

    {

        public void Test()

        {

            var settings = new JsonSerializerSettings

            {

                ContractResolver = new PreferISerializableContractResolver(),

            };

            AssertFailedException testAssertException = new AssertFailedException(msg: "This is a test");

            JToken assertJToken = JToken.FromObject(testAssertException, JsonSerializer.CreateDefault(settings)); // FIXED COMPILATION

            Console.WriteLine(assertJToken);

            var newException = assertJToken.ToObject<Exception>();

            Console.WriteLine("Exception deserialized successfully: ");

            Console.WriteLine(newException);

        }

    }

​

    public class Program

    {

        public static void Main()

        {

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

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                new TestClass().Test();

                Console.WriteLine("All tests passed.");

            }

            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.Location.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;

        }

    }

​