为视图生成下拉框方法

//1.为视图生成下拉框方法准备SelectListItem集合
ViewBag.listItem=db.BlogArticleCates.Where(c=>c.IsDel==false).ToList().Select(c => new SelectListItem() { Value = c.Id.ToString(), Text = c.Name });

//交给EF的LINQ不能包含非SQL语法,但是集合类型的LINQ可以包含非SQL语法(如:tostring())

 //2.使用 SelectList 来准备 下拉框方法 所需的 数据
            List<Models.BlogArticleCate> list = db.BlogArticleCates.Where(c => c.IsDel == false).ToList();
            ViewBag.selList = new SelectList(list,"Id","Name");

  ViewBag.statuList = new SelectList(db.Enumerations.Where(e => e.e_isDel == false && e.e_type == "3").ToList(), "e_id", "e_cname");

@*@Html.DropDownListFor(a=>a.ACate,ViewBag.listItem as IEnumerable<SelectListItem>)*@
                    @Html.DropDownListFor(a=>a.ACate,(ViewBag.selList as SelectList).ToList())