Razor操作Dropdownlist

目的：为Dropdownlist赋值，并获得项目选项值itemID

法一：

//项目列表

ViewData["ItemID"] = string.IsNullOrEmpty(itemID) ? "4" : itemID;

var Result = from a in db.Fee_Items

where a.CategoryID == 7   /*7是工作量*/

select new SelectListItem
{
Text = a.ItemName,
Value = a.ItemID
};

ViewData["ItemList"] = Result.Distinct();

调用：

@Html.DropDownList("ItemID", @ViewBag.ItemList as IEnumerable<SelectListItem>)

法二

//当前项目
ViewData["ItemID"] = string.IsNullOrEmpty(itemID) ? "4" : itemID;
//项目列表，参数为数据源，id值，显示文本，默认值
ViewData["ItemIist"] = new SelectList(db.Fee_Items.Where(X => X.CategoryID == 1 || X.CategoryID == 2), "ItemID", "ItemName", ViewData["ItemID"]);

调用： @Html.DropDownList("ItemID", ViewData["ItemIist"] as SelectList);