/// <summary>

        /// 把对象序列化 JSON 字符串

        /// </summary>

        /// <typeparam name="T">对象类型</typeparam>

        /// <param name="obj">对象实体</param>

        /// <returns>JSON字符串</returns>

        public static string GetJson<T>(T obj)

        {

            DataContractJsonSerializer json = new DataContractJsonSerializer(typeof(T));

            using (MemoryStream ms = new MemoryStream())

            {

                json.WriteObject(ms, obj);

                string resultJson= Encoding.UTF8.GetString(ms.ToArray());

                return resultJson;

            }

        }

        /// <summary>

        /// 把JSON字符串还原为对象

        /// </summary>

        /// <typeparam name="T">对象类型</typeparam>

        /// <param name="resultJson">JSON字符串</param>

        /// <returns>对象实体</returns>

        public static T ParseFormJson<T>(string resultJson)

        {

            T obj = Activator.CreateInstance<T>();

            using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(resultJson)))

            {

                DataContractJsonSerializer dcj = new DataContractJsonSerializer(typeof(T));

                return (T)dcj.ReadObject(ms);

            }

        }