JsonConverter

JsonConverter.cs

using System;
using System.Collections.Generic;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace Flayed.JsonConverterDemo
{
    public class CustomJsonConverter : JsonConverter
    {
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            // Make sure the value type is correct
            if (!(value is Dictionary<string, string>)) return;
            Dictionary<string, string> field = (Dictionary<string, string>)value;

            // Custom fields are an object of key value pairs
            writer.WriteStartObject();
            foreach (string key in field.Keys)
            {
                writer.WritePropertyName(key);
                serializer.Serialize(writer, field[key]);
            }
            writer.WriteEndObject();
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            Dictionary<string, string> customFields = new Dictionary<string, string>();
            JObject jobj = new JObject(reader.Value);

            foreach (var prop in jobj)
            {
                customFields.Add(prop.Key, prop.Value.Value<string>());
            }

            return customFields;
        }

        public override bool CanConvert(Type objectType)
        {
            return typeof(Dictionary<string, string>).IsAssignableFrom(objectType);
        }
    }
}