public async Task <HttpResponseMessage> Get([FromUri] preg_answer data)
 {
     try
     {
         int user_id = Convert.ToInt32(((ClaimsIdentity)(User.Identity)).FindFirst("id").Value);
         IQueryable <preg_answer> result;
         if (!data.DeepEquals(new preg_answer()))
         {
             data.user_id = user_id;
             result       = dao.GetItemsByParams(data);
         }
         else
         {
             result = dao.GetListItem().Where(c => c.user_id == user_id);
         }
         if (result.ToList().Any())
         {
             return(Request.CreateResponse(HttpStatusCode.OK, result));
         }
         else
         {
             HttpError err = new HttpError(SysConst.DATA_NOT_FOUND);
             return(Request.CreateErrorResponse(HttpStatusCode.NotFound, err));
         }
     }
     catch (Exception ex)
     {
         HttpError err = new HttpError(ex.Message);
         return(Request.CreateErrorResponse(HttpStatusCode.BadRequest, err));
     }
 }
        public HttpResponseMessage Put(string question_id, [FromBody] preg_answer dataUpdate)
        {
            try
            {
                int user_id = Convert.ToInt32(((ClaimsIdentity)(User.Identity)).FindFirst("id").Value);
                if (!dataUpdate.DeepEquals(new preg_answer()))
                {
                    preg_answer answer = dao.GetItemByID(user_id, Convert.ToInt32(question_id)).FirstOrDefault();
                    if (answer == null)
                    {
                        return(Request.CreateErrorResponse(HttpStatusCode.NotFound, SysConst.DATA_NOT_FOUND));
                    }
                    if (dataUpdate.questiondate != null)
                    {
                        answer.questiondate = dataUpdate.questiondate;
                    }
                    if (dataUpdate.title != null)
                    {
                        answer.title = dataUpdate.title;
                    }
                    if (dataUpdate.content != null)
                    {
                        answer.content = dataUpdate.content;
                    }

                    dao.UpdateData(answer);
                    return(Request.CreateResponse(HttpStatusCode.Accepted, SysConst.DATA_UPDATE_SUCCESS));
                }
                else
                {
                    HttpError err = new HttpError(SysConst.DATA_NOT_EMPTY);
                    return(Request.CreateErrorResponse(HttpStatusCode.BadRequest, err));
                }
            }
            catch (Exception ex)
            {
                HttpError err = new HttpError(ex.Message);
                return(Request.CreateErrorResponse(HttpStatusCode.BadRequest, err));
            }
        }