MVC中使用DropDownListFor

1 查找DropDownListFor要绑定的数据源

IEnumerable<NewsType> newsTypeList = (from m in db.NewsType select m).ToList();//从数据库中查找数据。
 SelectList slist = new SelectList(newsTypeList, "TypeId", "TypeName");//将查找出来的数据，转化为列表对象
ViewData["List"] = slist;//使用ViewData对象保存列表对象，在页面控件绑定时用到ViewData["List"]

2 在页面上进行绑定

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

3 显示指定项：语法其实和绑定是一样，程序自己会根据 model.TypeId的值，进行选择显示

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