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/51802068/how-to-escape-especial-characters-in-json?noredirect=1#comment90566353_51802068

    //https://stackoverflow.com/questions/51845381/how-to-escape-embedded-json-after-unescape

    public class VData

    {

        public object RNumber { get; set; }

        public string BRNumber { get; set; }

    }

​

    public class Number

    {

        [JsonProperty("@paraID")]

        public string paraID { get; set; }

        [JsonProperty("@Value")]

        public string Value { get; set; }

        [JsonProperty("@label")]

        public string label { get; set; }

    }

​

    public class Evaluation

    {

        public List<Number> number { get; set; }

    }

​

    public class JsonFile

    {

        public Evaluation evaluation { get; set; }

        public DateTime DateTime = DateTime.UtcNow;

        public string PossibleNull = null;

    }

​

    public class OnlineFields

    {

        public string CCode { get; set; }

        public string MNumber { get; set; }

        public string Product { get; set; }

        [JsonConverter(typeof(EmbeddedLiteralConverter<JsonFile>))]

        public JsonFile JsonFile { get; set; }

    }

​

    public class Response

    {

        public object Message { get; set; }

        public bool Error { get; set; }

        public VData VData { get; set; }

        public OnlineFields onlineFields { get; set; }

        public DateTime DateTime = DateTime.UtcNow;

        public string PossibleNull = null;

    }

​

    public class EmbeddedLiteralConverter<T> : JsonConverter

    {

        public override bool CanConvert(Type objectType)

        {

            return typeof(T).IsAssignableFrom(objectType);

        }

​

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

        {

            using (new PushValue<bool>(true, () => Disabled, (canWrite) => Disabled = canWrite))

            {

                using (var sw = new StringWriter(writer.Culture))

                {

                    // Copy relevant settings

                    using (var nestedWriter = new JsonTextWriter(sw) 

                    { 

                        DateFormatHandling = writer.DateFormatHandling,

                        DateFormatString = writer.DateFormatString,

                        DateTimeZoneHandling = writer.DateTimeZoneHandling,

                        StringEscapeHandling = writer.StringEscapeHandling,

                        FloatFormatHandling = writer.FloatFormatHandling,

                        Culture = writer.Culture,

                        // Remove if you don't want the escaped \r\n characters in the embedded JSON literal:

                        Formatting = writer.Formatting, 

                    })

                    {

                        serializer.Serialize(nestedWriter, value);

                    }

                    writer.WriteValue(sw.ToString());

                }

            }

        }

​

        [ThreadStatic]

        static bool disabled;

​

        // Disables the converter in a thread-safe manner.

        bool Disabled { get { return disabled; } set { disabled = value; } }

​

        public override bool CanWrite { get { return !Disabled; } }

​

        public override bool CanRead { get { return !Disabled; } }

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

        {

            if (reader.TokenType == JsonToken.Null)

                return null;

            var contract = serializer.ContractResolver.ResolveContract(objectType);

            if (contract is JsonPrimitiveContract)

                throw new JsonSerializationException("Invalid type: " + objectType);

            if (existingValue == null)

                existingValue = contract.DefaultCreator();

            if (reader.TokenType == JsonToken.String)

            {

                var json = (string)JToken.Load(reader);

                using (var subReader = new JsonTextReader(new StringReader(json)))

                {

                    // By populating a pre-allocated instance we avoid an infinite recursion in EmbeddedLiteralConverter<T>.ReadJson()

                    // Re-use the existing serializer to preserve settings.

                    serializer.Populate(subReader, existingValue);

                }

            }

            else

            {

                serializer.Populate(reader, existingValue);

            }

            return existingValue;

        }

    }

​

    struct PushValue<T> : IDisposable

    {

        Action<T> setValue;

        T oldValue;

​

        public PushValue(T value, Func<T> getValue, Action<T> setValue)

        {

            if (getValue == null || setValue == null)

                throw new ArgumentNullException();

            this.setValue = setValue;

            this.oldValue = getValue();

            setValue(value);

        }

​

        #region IDisposable Members

​

        // By using a disposable struct we avoid the overhead of allocating and freeing an instance of a finalizable class.

        public void Dispose()

        {

            if (setValue != null)

                setValue(oldValue);

        }

​

        #endregion

    }

​

    class TestClass

    {

        public static void Test()

        {

            var testJson = GetJson();

            var settings = new JsonSerializerSettings

            {

                Converters = { new EmbeddedLiteralConverter<JsonFile>() },

                DateFormatString = "yyyy-MM-dd",

                NullValueHandling = NullValueHandling.Ignore,

            };

​

            var response = JsonConvert.DeserializeObject<Response>(testJson, settings);

​

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

​

            Console.WriteLine(json2);

        }

​

        static string GetJson()

        {

            var json = @"{  

   ""Message"":null,

   ""Error"":false,

   ""VData"":{  

      ""RNumber"":null,

      ""BRNumber"":""Session1""

   },

   ""onlineFields"":{  

      ""CCode"":""Web"",

      ""MNumber"":""15478655"",

      ""Product"":""100"",

      ""JsonFile"":""      {  

         \""evaluation\"":{  

            \""number\"":[  

               {  

                  \""@paraID\"":\""1000\"",

                  \""@Value\"":\""\"",

                  \""@label\"":\""We are america\""

               },

               {  

                  \""@paraID\"":\""2000\"",

                  \""@Value\"":\""100\"",

                  \""@label\"":\""We are japan\""

               },

               {  

                  \""@paraID\"":\""3000\"",

                  \""@Value\"":\""1000\"",

                  \""@label\"":\""We are UK\""

               },

               {  

                  \""@paraID\"":\""4000\"",

                  \""@Value\"":\""\"",

                  \""@label\"":\""We are China\""

               }

            ]

         }

      } ""     

   }

}";

            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");

        }

    }

​