mvc 个别字段无法赋值的问题

public ActionResult ClueParameterEdit(string type, string id, string refreshFunction)
        {
            Cust_clue_dict model = null;
            if (!string.IsNullOrEmpty(id))
            {
                Guid guidId = new Guid(id);
                model = new ClueBaseLogic().GetCommomDict(c => c.ID == guidId).First();
            }
            else
            {
                model = new Cust_clue_dict();
                model.DICT_TYPE = type;
                model.ID = System.Guid.NewGuid();
            }
            ViewBag.RefreshFunction = refreshFunction;
            return View(model);
        }