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 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/58207274/mix-jsonextensiondata-with-missingmemberhandling-error-with-json-net

​

    [JsonObject(MissingMemberHandling = MissingMemberHandling.Ignore)]

    public class Foo

    {

        public int Y { get; set; }

​

        [JsonExtensionData]

        private IDictionary<string, JToken> _extraStuff;

    }

​

    class TestClass

    {

        public static void Test()

        {

            var json = GetJson();

            var serializerSettings = new JsonSerializerSettings 

            { 

                MissingMemberHandling = MissingMemberHandling.Error 

            };          

            var foo = JsonConvert.DeserializeObject<Foo>(json, serializerSettings);

            var json2 = JsonConvert.SerializeObject(foo, Formatting.Indented, serializerSettings);

            Console.WriteLine("Re-serialized {0}:", foo);

            Console.WriteLine(json2);

        }   

        static string GetJson()

        {

            var json = @"{

  ""y"": 1,

  ""z"": ""added in foo""

}";

            return json;

        }

    }

​

​

    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

            {

                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;

        }

    }

​