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/54759586/can-i-use-json-net-to-serialize-objects-to-javascript-constructor-invocations

​

    public class WeeklySalesData

    {

        string weekName;

        DateTime date;

        decimal totalSales;

​

        // If WeeklySalesData had multiple constructors, you could mark the one to use as follows:

        // [JsonConstructor]

        public WeeklySalesData(string weekName, DateTime date, decimal totalSales)

        {

            this.weekName = weekName;

            this.date = date;

            this.totalSales = totalSales;

        }

​

        public string WeekName { get { return weekName; } }

​

        public DateTime Date { get { return date; } }

​

        public decimal TotalSales { get { return totalSales; } }

    }

​

    public class ConstructorConverter<T> : JsonConverter

    {

        public override bool CanConvert(Type objectType)

        {

            return typeof(T) == objectType;

        }

​

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

        {

            throw new NotImplementedException();

        }

​

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

        {

            var contract = serializer.ContractResolver.ResolveContract(value.GetType()) as JsonObjectContract;

            if (contract == null)

                throw new JsonSerializationException(string.Format("Type {0} does not correspond to a JSON object.", value.GetType()));

            // Possibly check whether JsonObjectAttribute is applied, and use JsonObjectAttribute.Title if present.

            writer.WriteStartConstructor(value.GetType().Name);

            foreach (var provider in contract.GetConstructorParameterValueProviders())

            {

                serializer.Serialize(writer, provider.GetValue(value));

            }

            writer.WriteEndConstructor();

        }

    }

​

    public static partial class JsonExtensions

    {

        internal static IEnumerable<IValueProvider> GetConstructorParameterValueProviders(this JsonObjectContract contract)

        {

            return contract.CreatorParameters.Select(p => contract.GetConstructorParameterValueProvider(p)).ToArray();

        }

​

        internal static IValueProvider GetConstructorParameterValueProvider(this JsonObjectContract contract, JsonProperty parameter)

        {

            if (parameter.ValueProvider != null)

                return parameter.ValueProvider;

            var property = contract.Properties.GetClosestMatchProperty(parameter.PropertyName);

            var provider = property == null ? null : property.ValueProvider;

            if (provider == null)

                throw new JsonSerializationException(string.Format("Cannot get IValueProvider for {0}", parameter));

            return provider;

        }

    }

​

​

    class TestClass

    {

        public static void Test()

        {

            var data = new WeeklySalesData("2018W1", new DateTime(2019, 2, 15, 0, 0, 0, DateTimeKind.Utc), 1100);

            var settings = new JsonSerializerSettings

            {

                Converters = { new JavaScriptDateTimeConverter(), new ConstructorConverter<WeeklySalesData>() },

            };

​

            var json = JsonConvert.SerializeObject(new [] { data }, Formatting.Indented, settings);

​

            Console.WriteLine(json);

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

            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;

            }

        }

    }

​