如何将项添加到ASP.net MVC中的SelectList

public ActionResult Index()
{
    List<SelectListItem> items = new List<SelectListItem>();
    items.Add(new SelectListItem { Text = "选项1", Value = "1" });
    items.Add(new SelectListItem { Text = "选项2", Value = "2" });
    items.Add(new SelectListItem { Text = "选项3", Value = "3" });

    ViewBag.MySelectList = new SelectList(items, "Value", "Text");

    return View();
}

@Html.DropDownList("MySelectList", (SelectList)ViewBag.MySelectList, "请选择一个选项", new { @class = "form-control" })