@using(Html.BeginForm() )
{
    <fieldset>
        <dl>
            <dt>
                @Html.LabelFor(x => x.SelectedId)
            </dt>
           <dd>
                @Html.DropDownListFor(x => x.SelectedId,Model.CategoryList)
           </dd>
        </dl>
    </fieldset>
 
    <input type="submit" value="Search" />
}

这假定以下视图模型：

public class Myviewmodel
{
    [DisplayName("Select a category")]
    public int SelectedId { get; set; }
 
    public IEnumerable<SelectListItem> CategoryList { get; set; }
}

将由您的控制器处理：

public ActionResult Index()
{
    var model = new Myviewmodel();
    // TODO: this list probably comes from a repository or something
    model.CategoryList = new[]
    {
        new SelectListItem { Value = "1",Text = "category 1" },new SelectListItem { Value = "2",Text = "category 2" },new SelectListItem { Value = "3",Text = "category 3" },};
    return View(model);
}
 
[HttpPost]
public ActionResult Index(Myviewmodel model)
{
    // here you will get the selected category id in model.SelectedId
    return Content("Thanks for selecting category id: " + model.SelectedId);
}