c# 实体序列化为json 与json序列化为实体

/// <summary>
        /// 序列化为JSON
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string Serialize<T>(T obj)
        {
            System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(obj.GetType());
            using (MemoryStream ms = new MemoryStream())
            {
                serializer.WriteObject(ms, obj);
                string retVal = Encoding.Default.GetString(ms.ToArray());
                return retVal;
            }
        }

        /// <summary>
        /// 反序列化为对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="json"></param>
        /// <returns></returns>
        public static T Deserialize<T>(string json)
        {
            T obj = Activator.CreateInstance<T>();
            using (MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(json)))
            {
                System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(obj.GetType());
                obj = (T)serializer.ReadObject(ms);
                ms.Close();
                return obj;
            }
        }