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 Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

    // https://stackoverflow.com/questions/50313978/json-net-serialize-generic-type-wrapper-without-property-name

    //[JsonConverter(typeof(ValueConverter))]

    public class ValueObject<T>

    {

        readonly T value;

​

        public T Value { get { return value; } }

        public ValueObject(T value) { this.value = value; }

​

        // various other equality members etc...

    }

​

    class ValueConverter : JsonConverter

    {

        static Type GetValueType(Type objectType)

        {

            return objectType

                .BaseTypesAndSelf()

                .Where(t => t.IsGenericType && t.GetGenericTypeDefinition() == typeof(ValueObject<>))

                .Select(t => t.GetGenericArguments()[0])

                .FirstOrDefault();

        }

​

        public override bool CanConvert(Type objectType)

        {

            return GetValueType(objectType) != null;

        }

​

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

        {

            // You need to decide whether a null JSON token results in a null ValueObject<T> or 

            // an allocated ValueObject<T> with a null Value.

            if (reader.SkipComments().TokenType == JsonToken.Null)

                return null;

            var valueType = GetValueType(objectType);

            var value = serializer.Deserialize(reader, valueType);

​

            // Here we assume that every subclass of ValueObject<T> has a constructor with a single argument, of type T.

            return Activator.CreateInstance(objectType, value);

        }

​

        //const string ValuePropertyName = nameof(ValueObject<object>.Value);

        const string ValuePropertyName = "Value";

​

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

        {

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

            var valueProperty = contract.Properties.Where(p => p.UnderlyingName == ValuePropertyName).Single();

            // You can simplify this to .Single() if ValueObject<T> has no other properties:

            // var valueProperty = contract.Properties.Single();

            serializer.Serialize(writer, valueProperty.ValueProvider.GetValue(value));

        }

    }

​

    public static partial class JsonExtensions

    {

        public static JsonReader SkipComments(this JsonReader reader)

        {

            while (reader.TokenType == JsonToken.Comment && reader.Read())

                ;

            return reader;

        }

    }

​

    public static class TypeExtensions

    {

        public static IEnumerable<Type> BaseTypesAndSelf(this Type type)

        {

            while (type != null)

            {

                yield return type;

                type = type.BaseType;

            }

        }

    }

​

    public class CustomerId : ValueObject<Guid>

    {

        public CustomerId(Guid value) : base(value) { }

    }

​

    public class EmailAddress : ValueObject<string>

    {

        public EmailAddress(string value) : base(value) { }

    }

​

    public class Customer

    {

        public CustomerId Id { get; private set; }

        public EmailAddress Email { get; private set; }

​

        public Customer(CustomerId id, EmailAddress email)

        {

            Id = id;

            Email = email;

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var desiredJson = @"{""id"": ""f5ce21a5-a0d1-4888-8d22-6f484794ac7c"",""email"": ""some@email.com""}";

​

            var customer = new Customer(new CustomerId(new Guid("f5ce21a5-a0d1-4888-8d22-6f484794ac7c")), new EmailAddress("some@email.com"));

​

            var settings = new JsonSerializerSettings

            {

                Converters = { new ValueConverter() },

                ContractResolver = new CamelCasePropertyNamesContractResolver() 

            };

            var customerAsJson = JsonConvert.SerializeObject(customer, Formatting.Indented, settings);

​

            Console.WriteLine("Serialized {0}:", customer);

            Console.WriteLine(customerAsJson);

​

            Assert.IsTrue(JToken.DeepEquals(JToken.Parse(customerAsJson), JToken.Parse(desiredJson)));

​

            var customer2 = JsonConvert.DeserializeObject<Customer>(customerAsJson, settings);

​

            Assert.IsTrue(customer.Email.Value == customer2.Email.Value && customer.Id.Value == customer2.Id.Value);

        }

    }

​

    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;

            }

        }

    }

​

    public class AssertionFailedException : System.Exception

    {

        public AssertionFailedException() : base() { }

​

        public AssertionFailedException(string s) : base(s) { }

    }

​

    public static class Assert

    {

        public static void IsTrue(bool value)

        {

            IsTrue(value, "failed");

        }

​

        public static void IsTrue(bool value, string message)

        {

            if (value == false)

                throw new AssertionFailedException(message ?? "failed");

        }

    }

​