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/58501943/how-to-make-json-serialize-ignore-dictionary-keys

​

    public class RootObject

    {

        public IDictionary<string, string> CustomAttributes { get; set; }       

    }

​

    [JsonDictionary(NamingStrategyType = typeof(DefaultNamingStrategy))]

    public class VerbatimDictionary<TKey, TValue> : Dictionary<TKey, TValue>

    {

    }

​

    class TestClass

    {

        public static void Test()

        {

            var root = new RootObject

            {

                CustomAttributes = new VerbatimDictionary<string, string>()

                {

                    {"Custom Attribute 1", "1"},

                    {"CustomAttribute 2", "2"}

                }

            };

            var settings = new JsonSerializerSettings

            {

                ContractResolver = new CamelCasePropertyNamesContractResolver(),

            };

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

            Console.WriteLine(json);

            Assert.IsTrue(((JObject)JToken.Parse(json)["customAttributes"]).Properties().Select(p => p.Name).SequenceEqual(root.CustomAttributes.Keys));

            Assert.IsTrue(JsonConvert.DeserializeObject<RootObject>(json, settings).CustomAttributes.Keys.SequenceEqual(root.CustomAttributes.Keys));

        }   

    }

​

    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;

        }

    }

​