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;

​

//https://stackoverflow.com/questions/52303222/deserialize-nested-json-into-c-sharp-class

​

    public class Info

    {

        public string prop1 {get;set;}

        public string prop2 {get;set;}

        public int prop3 {get;set;}

        // Modified from 

        //public Dictionary<string, List<int>> prop4 {get;set}

        public List<Dictionary<string, int>> prop4 {get;set;}

    }

​

    public class Response

    {

        // Modified from 

        //public class Dictionary<string, List<Info>> Item {get;set;}

        public Dictionary<string, Info> Items {get;set;}

    }

​

    class TestClass

    {

        public static void Test()

        {

            var json = GetJson();

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

            var json2 = JsonConvert.SerializeObject(root, Formatting.Indented, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });

            Console.WriteLine("Deserialized and re-serialized {0}:", root);

            Console.WriteLine(json2);

        }

        static string GetJson()

        {

            var json = @"{

    ""Items"": {

        ""Item_1A"": {

            ""prop1"": ""string"",

            ""prop2"": ""string"",

            ""prop3"": 1,

            ""prop4"": [{

                ""prop_x"": 100

            },

            {

                ""prop_y"": 200

            }]

        },

        ""Item2B"": {

            ""prop1"": ""string"",

            ""prop2"": ""string"",

            ""prop3"": 14,

            ""prop4"": [{

                ""prop_z"": 300

            }]

        }

    }

}";

            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;

            }

        }

    }

​