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.ComponentModel;

​

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/65460852/json-net-not-utilizing-typeconverter-for-dictionary-key

​

    [TypeConverter(typeof(TimeConverter))]

    public class Time : IComparable<Time>

    { 

        public string Value { get; set; }

​

        public int CompareTo (Time other) => Value.CompareTo(other.Value); // May need null checks

        public override string ToString() => Value ?? "";

        public static Time Parse(string s) => new Time { Value = s };

    }

​

    public class TimeConverter : TypeConverter

    {

        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)

        {

            return sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);

        }

​

        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)

        {

            return value is string s ? Time.Parse(s) : base.ConvertFrom(context, culture, value);

        }

​

        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)

        {

            return destinationType == typeof(string) && value is Time t

            ? t.ToString()

            : base.ConvertTo(context, culture, value, destinationType);

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var time = Time.Parse("7:00AM");

            var json = JsonConvert.SerializeObject(time);

            Console.WriteLine(json);

​

            var dictionary = new SortedDictionary<Time, string> {

                [Time.Parse("7:00AM")] = "aaa",

                [Time.Parse("8:00AM")] = "bbb",

                [Time.Parse("9:00AM")] = "ccc"

            };

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

            Console.WriteLine(json2);

            var dictionary2 = JsonConvert.DeserializeObject<SortedDictionary<Time, string>>(json2);

            dictionary2.Dump();

            Assert.IsTrue(dictionary.Values.SequenceEqual(dictionary2.Values));

​

            Assert.IsTrue(dictionary.Keys.Select(k => k.ToString()).SequenceEqual(dictionary2.Keys.Select(k => k.ToString())));

        }   

    }

​

    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();

​

            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;

        }

    }

​