json序列化及反序列化

         /// <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);
            }
        }