asp.net mvc下拉框Html.DropDownList 和DropDownListFor的常用方法

一、非强类型：

controller:
viewdata["areid"] = from a in rp.getarea()
                               select new selectlistitem {
                               text=a.areaname,
                               value=a.areaid.tostring()
                               };
view:
@html.dropdownlist("areid")

还可以给其加上一个默认选项：@html.dropdownlist("areid", "请选择");

二、强类型：

dropdownlistfor常用的是两个参数的重载，第一参数是生成的select的名称，第二个参数是数据，用于将绑定数据源至dropdownlistfor

modle:

   public class settingsviewmodel
   {
       repository rp =new repository();
       public string listname { get; set; } 
       public  ienumerable<selectlistitem> getselectlist()
       {
               var selectlist = rp.getarea().select(a => new selectlistitem {
                               text=a.areaname,
                               value=a.areaid.tostring()
                               });
               return selectlist;
           }
       }

controller:
       public actionresult index()
       {
           return view(new settingsviewmodel());
       }

view:
@model mvc３applicationtest2.models.settingsviewmodel
@html.dropdownlistfor(m=>m.listname,model.getselectlist(),"请选择")