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 System.Collections.Specialized;

​

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/52721999/modelstate-error-newtonsoft-json-jsonserializationexception-cannot-populate-l?noredirect=1#comment92399021_52721999

​

    public class NotificationDTO

    {

        public long idCompanyService { get; set; }

​

        //public DocTypeEnum DocumentType { get; set; }

​

        public List<Tuple<string, byte[], System.Net.Mime.ContentType>> Attachments { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            TestStringDictionary();

            TestSimple();

            TestFull();

        }

​

        static void TestStringDictionary()

        {

            StringDictionary myCol = new StringDictionary();

            myCol.Add( "red", "rojo" );

            myCol.Add( "green", "verde" );

            myCol.Add( "blue", "azul" );        

            myCol.Add( "blue", "2azul" );       

            var json = JsonConvert.SerializeObject(myCol);

            Console.WriteLine(json);

        }

        static void TestSimple()

        {

            var json = @"{""Boundary"":null,""CharSet"":null,""MediaType"":""application/pdf"",""Name"":null,""Parameters"":[]}";

​

            Console.WriteLine("Trying to deserialize a {0}: ", typeof(System.Net.Mime.ContentType));

            var content = JsonConvert.DeserializeObject<System.Net.Mime.ContentType>(json);

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

            Console.WriteLine(json2);           

        }

        public static void TestFull()

        {

            var json = @"{""idCompanyService"":1234,""DocumentType"":0,""Attachments"":[{""Item1"":""test.pdf"",""Item2"":""AAAA"",""Item3"":{""Boundary"":null,""CharSet"":null,""MediaType"":""application/pdf"",""Name"":null,""Parameters"":[]}}}";

            Console.WriteLine("Trying to deserialize a {0}: ", typeof(NotificationDTO));

            var dto = JsonConvert.DeserializeObject<NotificationDTO>(json);

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

            Console.WriteLine(json2);           

        }

    }

​

    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;

            }

        }

    }

​