asp.net mvc下拉框Html.DropDownList 和DropDownListFor的常用方法_實用技巧

一、非強型別：

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

還可以給其加上一個預設選項：@Html.DropDownList("AreId", "請選擇");

二、強型別：

DropDownListFor常用的是兩個參數的重載，第一參數是產生的select的名稱，第二個參數是資料，用於將綁定資料來源至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(),"請選擇")