public class JsonHelper    {        /// 
        /// 将Model转换为Json字符串        /// 
        /// 
             ///         /// 
             public static string GetJson
     
      (T obj)        {            try            {                DataContractJsonSerializer json = new DataContractJsonSerializer(typeof(T));                using (MemoryStream ms = new MemoryStream())                {                    json.WriteObject(ms, obj);                    string strJson = Encoding.UTF8.GetString(ms.ToArray());                    string p = @"\\/Date\((\d+)\+\d+\)\\/";                    MatchEvaluator me = new MatchEvaluator(ConvertJsonDateToDateString);                    Regex rg = new Regex(p);                    strJson = rg.Replace(strJson, me);                    return strJson;                }            }            catch (Exception ex)            {                            }            return string.Empty;        }        /// 
      
        /// 将Json字符串转换为Model        /// 
        /// 
              /// 
              /// 
              public static T ParseJson
      
       (string strJson)        {            try            {                string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}[a-z,A-Z]";                MatchEvaluator me = new MatchEvaluator(ConvertDateTimeToJsonDate);                Regex rg = new Regex(p);                strJson = rg.Replace(strJson, me);                p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";                me = new MatchEvaluator(ConvertDateTimeToJsonDate);                rg = new Regex(p);                strJson = rg.Replace(strJson, me);                using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(strJson)))                {                    DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(T));                    T obj = (T)serializer.ReadObject(ms);                    return obj;                }            }            catch (Exception ex)            {                           }            return default(T);        }        /// 
       
        /// 将Json序列化的时间由/Date(1294499956278+0800)转为字符串        /// 
        /// 
               /// 
               private static string ConvertJsonDateToDateString(Match m)        {            string result = string.Empty;            DateTime dt = new DateTime(1970, 1, 1);            dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));            dt = dt.ToLocalTime();            result = dt.ToString("yyyy-MM-dd HH:mm:ss");            return result;        }        /// 
       
        /// 将时间字符串转化成json时间        /// 
        /// 
               /// 
               private static string ConvertDateTimeToJsonDate(Match m)        {            string result = string.Empty;            DateTime dt = DateTime.Parse(m.Groups[0].Value);            dt = dt.ToUniversalTime();            TimeSpan ts = dt - DateTime.Parse("1970-01-01");            result = string.Format("\\/Date({0}+0800)\\/", ts.TotalMilliseconds);            return result;        }    }
      
     

注：如果是要将Class类Json序列化时，在实体类上面和成员上面添加一个契约，和WCF 契约一样。

举例如：

/// 
    /// 至爱甄选实体类    /// 
    [Serializable]    [DataContract]    public class FavoriteInfo    {        private int _id;        private string _title;/// 
        /// 至爱甄选Id        /// 
        [DataMember]        public int Id        {            set { _id = value; }            get { return _id; }        }         [DataMember]        /// 
        /// 标题        /// 
        public string Title        {            set { _title = value; }            get { return _title; }        }}

调用方式如下：

//获取数据集，返回List
     
                  IList
      
        favoriteModelList = new PB.Favorite().GetFavoriteModelList(1, 1, "");            if (favoriteModelList!=null && favoriteModelList.Count>0)            {                string jsonString = JsonHelper.GetJson
       
        
         >(favoriteModelList);                context.Response.Write(jsonString);            }