public class JsonHelper
{/// <summary>/// 生成Json格式/// </summary>/// <typeparam name="T"></typeparam>/// <param name="obj"></param>/// <returns></returns>public static string GetJson<T>(T obj){DataContractJsonSerializer json = new DataContractJsonSerializer(obj.GetType());using (MemoryStream stream = new MemoryStream()){json.WriteObject(stream, obj);string szJson = Encoding.UTF8.GetString(stream.ToArray()); return szJson;}}/// <summary>/// 获取Json的Model/// </summary>/// <typeparam name="T"></typeparam>/// <param name="szJson"></param>/// <returns></returns>public static T ParseFromJson<T>(string szJson){T obj = Activator.CreateInstance<T>();using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(szJson))){DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());return (T)serializer.ReadObject(ms);}}
}public class topMenu
{public string id { get; set; }public string title { get; set; }public string defaulturl { get; set; }
}

topMenu t_menu = new topMenu(){id = "1",title = "全局",defaulturl = "123456"};
List<topMenu> l_topmenu = new List<topMenu>();
for (int i = 0; i < 3; i++){l_topmenu.Add(t_menu);}
Response.Write(JsonHelper.GetJson<List<topMenu>>(l_topmenu));

string szJson = @"{""id"":""1"",""title"":""全局"",""defaulturl"":""123456""} ";topMenu t_menu2 = JsonHelper.ParseFromJson<topMenu>(szJson);Response.Write(t_menu2.title);

JavaScriptSerializer jss = new JavaScriptSerializer();
Response.Write( jss.Serialize(l_topmenu )); 

string szJson = @"{""id"":""1"",""title"":""全局"",""defaulturl"":""123456""} ";
topMenu toptabmenu = jss.Deserialize<topMenu>(szJson);
Response.Write( jss.Serialize(toptabmenu.title));