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://github.com/JamesNK/Newtonsoft.Json/issues/1719

​

    class TestClass

    {

        public static void Test()

        {

            var a = JsonConvert.DeserializeObject<A>("{\"E\":null}", new JsonSerializerSettings

            {

                NullValueHandling = NullValueHandling.Ignore,

            });

            if (a.PropertyBag.ContainsKey("E"))

                throw new Exception("Not expected!");

        }

        class A

        {

            public A() { PropertyBag = new Dictionary<string, object>(); }

            [JsonProperty(DefaultValueHandling = DefaultValueHandling.IgnoreAndPopulate, NullValueHandling = NullValueHandling.Include)]

            public B? E { get; set; }

            [JsonExtensionData]

            public IDictionary<string, object> PropertyBag { get; set; }

        }

        enum B

        {

            One,

            Two

        }

    }

​

​

    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");

        }

    }

​