MVC dropdownlist使用

@{
    ViewBag.Title = "dropdownlist";
}

<h2>dropdownlist</h2>
@using (Html.BeginForm())
{
    <table>
        <tr>
            <td>test1</td>
            <td>
                <input type="radio" id="GenderM" name="Sex" value="男" />男
                <input type="radio" id="GenderF" name="Sex" value="女" checked />女
                <input type="text" id="1" name="1" value="1">
            </td>
        </tr>
        <tr>
            <td>test2</td>
            <td>
                @Html.DropDownList("name", ViewBag.selList1 as IEnumerable<SelectListItem>)
            </td>
        </tr>
    </table>

    <input type="submit" value="submit">

public ActionResult dropdownlist()
        {
            var q = from p in modeltest.Students select p;
            List<student> droptest = q.ToList();
            SelectList selList1 = new SelectList(droptest,"id","name");
            ViewBag.selList1 = selList1.AsEnumerable();  //选择数据库数据绑定
            return View();
        }
        
        [HttpPost]
        public ActionResult dropdownlist(string test="test")
        {
            var q = from p in modeltest.Students select p;
            List<student> droptest = q.ToList();
            ViewData["name"] = new SelectList(droptest,"id","name");     //重构dropdownlist
            var name = modeltest.Students.Find(Convert.ToInt32(Request.Form["name"]));
            formtest fm = new formtest { id = Convert.ToInt32(Request.Form["1"]), value1 = Request.Form["sex"], value2 = name.name };  //通过view中的数据给model对象赋值
            modeltest.formtest.Add(fm);
            modeltest.SaveChanges();
            return View(fm);
        }