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 AutoMapper;

​

//https://stackoverflow.com/questions/63380271/newtonsoft-json-auto-map-specific-properties

​

    public class SomeNonSerializableType

    {

        public string Value { get; set; }

​

        // Trick to generate errors serializing SomeNonSerializableType

        [OnDeserializing]

        void OnDeserializing(StreamingContext context) => throw new InvalidOperationException(string.Format("{0} cannot be deserialized.", GetType()));

​

        [OnSerializing]

        void OnSerializing(StreamingContext context) => throw new InvalidOperationException(string.Format("{0} cannot be serialized.", GetType()));

    }

​

    public class SomeSerializableType

    {

        public string Value { get; set; }

    }

​

    public class SomeClass

    {

        public SomeNonSerializableType Property { get; set; }

    }

​

    public class AutomapperConverter<TModel, TDTO> : JsonConverter

    {

        static readonly Lazy<MapperConfiguration> DefaultConfiguration 

            = new Lazy<MapperConfiguration>(() => new MapperConfiguration(cfg => cfg.CreateMap<TModel, TDTO>().ReverseMap()));

​

        public AutomapperConverter(MapperConfiguration config) => this.config = config ?? throw new ArgumentNullException(nameof(config));

        public AutomapperConverter() : this(DefaultConfiguration.Value) { }

        readonly MapperConfiguration config;

        public override bool CanConvert(Type type) => type == typeof(TModel);

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

        {

            var dto = config.CreateMapper().Map<TDTO>(value);

            serializer.Serialize(writer, dto);

        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

        {

            var dto = serializer.Deserialize<TDTO>(reader);

            return config.CreateMapper().Map(dto, dto.GetType(), objectType);

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var someClass = new SomeClass

            {

                Property = new SomeNonSerializableType { Value = "hello" },

            };

            // Configure this statically on startup

            MapperConfiguration configuration 

                = new MapperConfiguration(cfg => 

                                          {

                                              // Add all your mapping configurations here.

                                              // ReverseMap() ensures you can map from and to the DTO

                                              cfg.CreateMap<SomeNonSerializableType, SomeSerializableType>().ReverseMap();                                

                                          });

            // Set up settings using the global configuration.

            var settings = new JsonSerializerSettings

            {

                Converters = { new AutomapperConverter<SomeNonSerializableType, SomeSerializableType>(configuration) },

            };

            var json = JsonConvert.SerializeObject(someClass, Formatting.Indented, settings);

            Console.WriteLine(json);

            var deserialized = JsonConvert.DeserializeObject<SomeClass>(json, settings);

            Assert.AreEqual(someClass.Property.Value, deserialized.Property.Value);

            // Assert that SomeNonSerializableType really isn't serializable, so we know it's getting replaced properly.

            Assert.That(() => JsonConvert.SerializeObject(someClass), Throws.Exception);

            Assert.That(() => JsonConvert.DeserializeObject<SomeClass>(json), Throws.Exception);

        }   

    }

​

    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("{0} version: {1}", typeof(MapperConfiguration).Assembly.GetName().Name,  typeof(MapperConfiguration).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;

        }

    }

​