MVC中使用DropDownListFor

1 查找DropDownListFor要綁定的數據源

IEnumerable<NewsType> newsTypeList = (from m in db.NewsType select m).ToList();//從數據庫中查找數據。
 SelectList slist = new SelectList(newsTypeList, "TypeId", "TypeName");//將查找出來的數據，轉化為列表對象
ViewData["List"] = slist;//使用ViewData對象保存列表對象，在頁面控件綁定時用到ViewData["List"]

2 在頁面上進行綁定

<%: Html.DropDownListFor(model => model.TypeId,ViewData["List"] as SelectList, new { @id = "ddlType" })%> 

3 顯示指定項：語法其實和綁定是一樣，程序自己會根據 model.TypeId的值，進行選擇顯示

<%: Html.DropDownListFor(model => model.TypeId,ViewData["List"] as SelectList, new { @id = "ddlType" })%>