//把对象序列化为json对象public static string GetJson<T>(T obj){  DataContractJsonSerializer json=new   DataContractJsonSerializer(typeof(T));  using(MemoryStream ms=new MemoryStream())  {      json.WriteObject(ms,obj);      string szJson=Encoding.UTF8.GetString(ms.ToArray());      return szJson;     }    }    //把JSON字符串还原为对象public static T ParseFormJson<T>(string szJson){  T obj=Activator.CreateInstance<T>();  using(MemoryStream ms=new MemoryStream(Encoding.UTF8.GetBytes(szJson)))  {      DataContractJsonSerializer dcj=new DataContractJsonSerializer(typeof(T));      return (T)dcj.ReadObject(ms);   }      }