StringDictionary無法JSON反序列化

using Newtonsoft.Json;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Linq;

using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.IO;

using System.Linq;

using System.Runtime.Serialization.Formatters.Binary;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication3

{

    class Program

    {

        class StringDictionaryConverter : CustomCreationConverter<StringDictionary> {

            public override StringDictionary Create(Type objectType)

            {

                throw new NotImplementedException();

            }

            public override object ReadJson(JsonReader reader, Type objectType, 

                object existingValue, JsonSerializer serializer)

            {

                JArray array = JArray.Load(reader);

                StringDictionary dict = new StringDictionary();

                foreach (var element in array)

                {

                    dict.Add(element.Value<string>("Key"),

                        element.Value<string>("Value"));

                }

                return dict;

            }

        }

        static void Main(string[] args)

        {

            StringDictionary sd = new StringDictionary();

            sd.Add("Jeffrey", "32767");

            sd.Add("Darkthread", "65535");

            //印出StringDicionary內容

            Func<StringDictionary, string> dumpStringDictionary = (d) =>

            {

                List<string> list = new List<string>();

                foreach (string k in d.Keys)

                    list.Add(string.Format("{0}:\"{1}\"", k, d[k]));

                return "{" + string.Join(",", list.ToArray()) + "}";

            };

            //JSON序列化沒問題

            var json = JsonConvert.SerializeObject(sd);

            Console.WriteLine("JSON({1}bytes)={0}", json, json.Length);

            //反序列化會出現錯誤

            try

            {

                var test = JsonConvert.DeserializeObject<StringDictionary>(json);

            }

            catch (Exception ex)

            {

                Console.WriteLine("Error: {0}", ex.Message);

            }

            //加上自訂StringDictionary轉換器後可成功反序列化

            var restored = JsonConvert.DeserializeObject<StringDictionary>(json, 

                new StringDictionaryConverter());

            Console.WriteLine("Restored={0}", dumpStringDictionary(restored));

            //測試二進位序列化

            BinaryFormatter bf = new BinaryFormatter();

            byte[] data;

            using (MemoryStream ms = new MemoryStream())

            {

                bf.Serialize(ms, sd);

                data = ms.ToArray();

                Console.WriteLine("Binary({1}bytes)={0}",

                    Encoding.UTF8.GetString(data), data.Length);

            }

            using (MemoryStream msRestore = new MemoryStream(data))

            {

                restored = bf.Deserialize(msRestore) as StringDictionary;

                Console.WriteLine("Restored={0}", dumpStringDictionary(restored));

            }

            Console.Read();

        }

    }

}

            StringDictionary sd = new StringDictionary();

            for (int i = 0; i < 100; i++)

            {

                sd.Add("K" + i, "V" + i);

            }