private string Serializer<T>(T t)
        {
            JavaScriptSerializer json=new JavaScriptSerializer();
            return json.Serialize(t);
        }

private T DeSerialze<T>(string strJeson) {
            JavaScriptSerializer strJeson1 = new JavaScriptSerializer();
           return strJeson1.Deserialize<T>(strJeson);
        }

代码如下
/// <summary>
        /// create json data according to entity
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="t"></param>
        /// <returns></returns>
        public  static  string GetJsonSerializar<T>(T t)
        {
            var ser = new DataContractJsonSerializer(typeof(T));
            using (MemoryStream ms=new MemoryStream())
            {
                ser.WriteObject(ms,t);
                return Encoding.UTF8.GetString(ms.ToArray());
            }
        }
        /// <summary>
        /// parse json data accroding to json string data
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="jsonStr"></param>
        /// <returns></returns>
        public static T ParseFromJson<T>(string jsonStr)
        {
            //T obj = Activator.CreateInstance<T>();
            //using (MemoryStream ms=new MemoryStream(Encoding.UTF8.GetBytes(jsonStr)))
            //{
            //    DataContractJsonSerializer jsonSerializer=new DataContractJsonSerializer(obj.GetType());
            //    return (T) jsonSerializer.ReadObject(ms);
            //}
            var ser = new DataContractJsonSerializer(typeof(T));
            var ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonStr));
            var obj = (T)ser.ReadObject(ms);
            return obj; 
        }

[DataContract]
    public class MsgEntity
    {
        [DataMember(Order = 0,IsRequired = true)]
        public string Msg { get; set; }

        [DataMember(Order = 1, IsRequired = false)]
        public string HtmlMsg { get; set; }
    }