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.Json;

using System.Runtime.Serialization;

​

​

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

​

//https://stackoverflow.com/questions/63621028/inherit-attribute-when-implementing-abstract-base-field-c-sharp

​

    public abstract class Base

    {

        [Newtonsoft.Json.JsonIgnore]

        [IgnoreDataMember]

        public abstract IComparable SortValue { get; }

    }

​

    public class Derived : Base

    {

        public int VoteCount { get; set; }

​

        // Desire: inherited JsonIgnore attribute

        public override IComparable SortValue => VoteCount;

    }

​

    class TestClass

    {

        public static void Test()

        {

            var derived = new Derived { VoteCount = 101 };

            var json1 = Newtonsoft.Json.JsonConvert.SerializeObject(derived);

            Console.WriteLine(json1); // {"VoteCount":101}

            var json2 = DataContractJsonSerializerHelper.ToContractJson(derived);

            Console.WriteLine(json2); // {"VoteCount":101}

        }   

    }

​

    public static partial class DataContractJsonSerializerHelper

    {

        private static MemoryStream GenerateStreamFromString(string value)

        {

            return new MemoryStream(Encoding.UTF8.GetBytes(value ?? ""));

        }

​

        public static string ToContractJson<T>(this T obj, DataContractJsonSerializer serializer = null)

        {

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

            using (var memory = new MemoryStream())

            {

                serializer.WriteObject(memory, obj);

                memory.Seek(0, SeekOrigin.Begin);

                using (var reader = new StreamReader(memory))

                {

                    return reader.ReadToEnd();

                }

            }

        }

​

        public static T FromContractJson<T>(string json, DataContractJsonSerializer serializer = null)

        {

            serializer = serializer ?? new DataContractJsonSerializer(typeof(T));

            using (var stream = GenerateStreamFromString(json))

            {

                var obj = serializer.ReadObject(stream);

                return (T)obj;

            }

        }

    }

​

    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.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;

        }

    }

​