using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

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/13170386/why-system-version-in-json-string-does-not-deserialize-correctly

​

#nullable disable

​

    public class VersionObjectConverter : JsonConverter<Version>

    {

        public VersionObjectConverter() : this(false) { } // Serialize as a string by default

        public VersionObjectConverter(bool serializeAsObject) { this.SerializeAsObject = serializeAsObject; }

​

        static readonly Newtonsoft.Json.Converters.VersionConverter InnerConverter = new Newtonsoft.Json.Converters.VersionConverter();

        bool SerializeAsObject { get; set; }

​

        class VersionDto

        {

            public int Major; public int Minor; public int Build = -1; public int Revision = -1; public Int16 MajorRevision = -1; public Int16 MinorRevision = -1;

            public Version ToVersion()

            {

                if (Build == -1)

                    return new Version(Major, Minor);

                else if (Revision == -1)

                    return new Version(Major, Minor, Build);

                else

                    return new Version(Major, Minor, Build, Revision);

            }

        }

        public override void WriteJson(JsonWriter writer, Version value, JsonSerializer serializer)

        {

            if (value == null)

                writer.WriteNull();

            else if (SerializeAsObject)

                serializer.Serialize(writer, new VersionDto { Major = value.Major, Minor = value.Minor, Build = value.Build, Revision = value.Revision, MajorRevision = value.MajorRevision, MinorRevision = value.MinorRevision});

            else

                InnerConverter.WriteJson(writer, value, serializer);

        }

​

        public override Version ReadJson(JsonReader reader, Type objectType, Version existingValue, bool hasExistingValue, JsonSerializer serializer)

        {

            switch (reader.MoveToContentAndAssert().TokenType)

            {

                case JsonToken.Null: return null;

                case JsonToken.String: return (Version)InnerConverter.ReadJson(reader, objectType, hasExistingValue ? existingValue : null, serializer);

                case JsonToken.StartObject: return serializer.Deserialize<VersionDto>(reader).ToVersion();

                default: throw new JsonSerializationException(string.Format("Unknown token type {0}", reader.TokenType));

            }

        }

    }

    public static partial class JsonExtensions

    {

        public static JsonReader MoveToContentAndAssert(this JsonReader reader)

        {

            if (reader == null)

                throw new ArgumentNullException("reader");

            if (reader.TokenType == JsonToken.None)       // Skip past beginning of stream.

                reader.ReadAndAssert();

            while (reader.TokenType == JsonToken.Comment) // Skip past comments.

                reader.ReadAndAssert();

            return reader;

        }

​

        public static JsonReader ReadAndAssert(this JsonReader reader)

        {

            if (reader == null)

                throw new ArgumentNullException("reader");

            if (!reader.Read())

                throw new JsonReaderException("Unexpected end of JSON stream.");

            return reader;

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var version = new Version(1, 2, 3, 0);

            var settings = new JsonSerializerSettings

            {

                Converters = { new VersionObjectConverter(serializeAsObject : true) }, // Use serializeAsObject : false if you don't want Version to be serialized as a JSON object

            };

            var reportJSON = JsonConvert.SerializeObject(version, settings); 

            var report2 = JsonConvert.DeserializeObject<Version>(reportJSON, settings)!;

            var reportJSON2 = JsonConvert.SerializeObject(report2, settings);

            Assert.That(reportJSON == "{\"Major\":1,\"Minor\":2,\"Build\":3,\"Revision\":0,\"MajorRevision\":0,\"MinorRevision\":0}"); // Passes

            Assert.That(report2 == version); // Passes

            Console.WriteLine(reportJSON);

​

            string defaultVersionJson = JsonConvert.SerializeObject(version);

            var report3 = JsonConvert.DeserializeObject<Version>(defaultVersionJson, settings)!;

​

            Assert.That(defaultVersionJson == "\"1.2.3.0\""); // Passes

            Console.WriteLine();

            TestRoundTrip(new Version(1, 2, 3, 4), false);

            TestRoundTrip(new Version(1, 2, 3, 4), true);

            TestRoundTrip(new Version(1, 2, 3), false);

            TestRoundTrip(new Version(1, 2, 3), true);

            TestRoundTrip(new Version(1, 2), false);

            TestRoundTrip(new Version(1, 2), true);

        }   

        static void TestRoundTrip(Version version, bool serializeAsObject)

        {

            var settings = new JsonSerializerSettings

            {

                Converters = { new VersionObjectConverter(serializeAsObject : serializeAsObject) }, // Use serializeAsObject : false if you don't want Version to be serialized as a JSON object

            };

            string reportJSON = "/* Comment */ " + JsonConvert.SerializeObject(version, settings) + " /* Comment */";

            Version report2 = JsonConvert.DeserializeObject<Version>(reportJSON, settings);

            Assert.That(report2 == version, "report2 == version"); // Passes

            var json2 = JsonConvert.SerializeObject(report2, settings);

            var report3 = JsonConvert.DeserializeObject<Version>(json2, settings);

            Assert.That(report3 == version, "report3 == version"); // Passes

            var flippedSettings = new JsonSerializerSettings

            {

                Converters = { new VersionObjectConverter(serializeAsObject : serializeAsObject) }, // Use serializeAsObject : false if you don't want Version to be serialized as a JSON object

            };

            var json3 = JsonConvert.SerializeObject(report2, flippedSettings);

            var report4 = JsonConvert.DeserializeObject<Version>(json3, settings);

            Assert.That(report4 == version, "report3 == version"); // Passes

            Console.WriteLine("JSON round-tripped successfully: {0}", reportJSON);

        }

    }

​

    // Base utilities

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1}), {2}", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion);

            Console.WriteLine("{0} version: {1}", typeof(JsonSerializer).Namespace, typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​