public ActionResult ParentCategory(bool showAll = false, string emptyTitle = "请选择")
        {
            var parenttypes = ProductCategoryService.GetParentCategorys(showAll).Select(o => new DropdownItem(o.CategorySN.ToString(), o.Title)).ToList();

            parenttypes.Insert(0, new DropdownItem("", Server.UrlDecode(emptyTitle), true));
            return(new JsonNetResult(parenttypes));
        }