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.Xml.Schema;

using System.Xml;

using System.Xml.Serialization;

​

using System.Runtime.Serialization;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

​

​

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

​

    //https://stackoverflow.com/questions/67529579/crash-after-serializing-jobject-with-datacontractserializer-and-xmldictionarywri

​

    public class RecursiveList<T> : List<RecursiveList<T>>

    {

    }

​

    public class RecursiveListStringSurrogate

    {

        // A dummy surrogate that serializes nothing, for testing purposes.

    }

​

    public class RecursiveListStringSurrogateSelector : ISerializationSurrogateProvider

    {

        public object GetDeserializedObject(object obj, Type targetType)

        {

            if (obj is RecursiveListStringSurrogate)

                return new RecursiveList<string>();

            return obj;

        }

​

        public object GetObjectToSerialize(object obj, Type targetType)

        {

            if (obj is RecursiveList<string>)

                return new RecursiveListStringSurrogate();

            return obj;

        }

​

        public Type GetSurrogateType(Type type) 

        {

            if (type == typeof(RecursiveList<string>))

                return typeof(RecursiveListStringSurrogate);

            return type;

        }

    }

​

    public static partial class DataContractSerializerHelper

    {

        public static string ToContractXml<T>(this T obj, DataContractSerializer serializer = null, XmlWriterSettings settings = null)

        {

            serializer = serializer ?? new DataContractSerializer(obj == null ? typeof(T) : obj.GetType());

            using (var textWriter = new StringWriter())

            {

                settings = settings ?? new XmlWriterSettings { Indent = true };

                using (var xmlWriter = XmlWriter.Create(textWriter, settings))

                {

                    serializer.WriteObject(xmlWriter, obj);

                }

                return textWriter.ToString();

            }

        }

​

        public static T FromContractXml<T>(this string xml, DataContractSerializer serializer = null)

        {

            using (var textReader = new StringReader(xml ?? ""))

            using (var xmlReader = XmlReader.Create(textReader))

            {

                return (T)(serializer ?? new DataContractSerializer(typeof(T))).ReadObject(xmlReader);

            }

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            Test(new List<string> ());

            Test(new List<List<string>> ());

            Test(new List<List<List<string>>> ());

            var list = new RecursiveList<string>();

​

            Test(list);

        }

​

        static void Test<T>(T root)

        {

            var surrogate = new RecursiveListStringSurrogateSelector();

​

            var serializer = new DataContractSerializer(root.GetType());

            serializer.SetSerializationSurrogateProvider(surrogate);

​

            MemoryStream stream1 = new MemoryStream();

            var writer = XmlDictionaryWriter.CreateBinaryWriter(stream1);

            serializer.WriteObject(writer, root);

            writer.Flush();

            Console.WriteLine(System.Text.Encoding.UTF8.GetString(stream1.GetBuffer(), 0, checked((int)stream1.Length)));

​

            var xml = root.ToContractXml(serializer);

            Console.WriteLine(xml);

            Console.WriteLine();

        }

    }

​

    public class Test

    {

        [IgnoreDataMember]

        public JObject obj { get; set; }

        [DataMember(Name = "obj", Order = 0, IsRequired = false)]

        public string objString { get { return obj?.ToString(); } set { obj = (value == null ? null : JObject.Parse(value)); } }

    }

​

​

    public class Program

    {

        public static void Main()

        {

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

            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.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;

        }

    }

​