public ActionResult ModuleElements(int userID)
        {
            if (!UserInfoServices.IsExists(u => u.ID == userID))
            {
                return(Json(new
                {
                    State = 0,
                    Message = "用户不存在"
                }));
            }
            List <Module> modules = UserInfoServices.LoadUserModule(userID);

            if (modules.Count <= 0)
            {
                ViewBag.ModuleTree = "\"\"";
            }
            else
            {
                ViewBag.ModuleTree = Serialization.SerializeObject(modules
                                                                   .Select(m => new
                {
                    id   = m.ID,
                    pId  = m.Parent?.ID,
                    name = m.Name
                }));
            }
            return(PartialView());
        }