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/52169522/newtonsoft-json-deserialise-missing-int-values-as-nulls-instead-of-zero

​

    public class MyClass

    {

        public class WorkSheet

        {

            public WorkSheet(string name, int? captionln)

            {

                wsName = name;

                captionLineNumber = captionln;

            }

​

            [JsonProperty("name")]

            string wsName;

​

            [JsonProperty("caption_ln")]

            int? captionLineNumber;

        }

        private int _defaultCaptionLineNum;

​

        [JsonProperty("defaultCaptionLineNum")]

        public int DefaultCaptionLineNum { get { return _defaultCaptionLineNum; } }

​

        private Dictionary<int, WorkSheet> _worksheets = new Dictionary<int, WorkSheet>();

​

        [JsonProperty("worksheets")]

        public Dictionary<int, WorkSheet> Worksheets { get { return _worksheets; } set { _worksheets = value; } }

​

        public MyClass()

        {           

            Console.WriteLine("New MyClass object created!");

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var json = GetJson();

            var root = JsonConvert.DeserializeObject<MyClass>(json);

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

            Console.WriteLine(json2);

        }

        static string GetJson()

        {

            var json = @"   {

      ""defaultCaptionLineNum"": 6,

      ""worksheets"": {

        ""0"": { ""name"": ""Ws1"", ""caption_ln"": 6 },

        ""1"": { ""name"": ""Ws2"", ""caption_ln"": null },

        ""2"": { ""name"": ""Ws3"" },

        ""3"": { ""name"": ""Ws4"", ""caption_ln"": 5 },

      }

}";

            return 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;

            }

        }

    }

​

    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");

        }

    }

​