MVC Html.DropDownList 和DropDownListFor 的常用方法

ViewData["AreId"] = from a in rp.GetArea()
                               select new SelectListItem { 
                               Text=a.AreaName,
                               Value=a.AreaId.ToString()
                               };
View:
@Html.DropDownList("AreId")

  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;
           }
       } 

  public ActionResult Index()
       {
           return View(new SettingsViewModel());
       }
View:
@model Mvc３Applicationtest2.Models.SettingsViewModel
@Html.DropDownListFor(m=>m.ListName,Model.GetSelectList(),"请选择")