MVC4.0中下来列表框的，两种使用方法DropDownList

后台控制器代码
 public ActionResult Drop()
        {
            var list = new List<SchoolInfo>();
            list.Add(new SchoolInfo() { SchoolID = 1, SName = "北京大学" });
            list.Add(new SchoolInfo() { SchoolID = 2, SName = "上海大学" });
            var model = new UserViewInfo();
            model.ID = 1;
            model.Name = "李春城";
            model.Age = 13;
            model.SCID = 1;
            model.Datas = list;
            ViewData.Model = model;

            ViewBag.Drop = new SelectList(model.Datas, "SchoolID", "SName");
            
            return View();
        }

前台rasor页面
@{
    Layout = null;
}
@model MVC4Demon.Models.UserViewInfo
<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Drop</title>
</head>
<body>
    <div>
      @Model.ID
    </div>
    <div>@Model.Name</div>
<!--第一种-->
    @*<div>@Html.DropDownList("Drop","请选择")</div>*@
<!--第二种-->
    <div><select id="Drop" name="Drop">
        <option id="0">请选择</option>
        @foreach (var item in Model.Datas)
        {
            <option id="@item.SchoolID" selected="@((Model.SCID==item.SchoolID)?"seletectd":"")">@item.SName</option>
        }
         </select></div>
</body>
</html>