Question

您好我试图将下拉列表分组

控制器中的

    public ActionResult Index()
    {
        IEnumerable<GroupedSelectListItem> item;
        item = new List<GroupedSelectListItem> {
                    new GroupedSelectListItem() { Value = "volvo", Text = "Volvo", GroupName = "Swedish Cars", GroupKey = "1", Disabled = true },
                    new GroupedSelectListItem() { Value = "saab", Text = "Saab",GroupName = "Swedish Cars", GroupKey = "1" },
                    new GroupedSelectListItem() { Value = "mercedes", Text = "Mercedes", GroupName = "German Cars", GroupKey = "2" },
                    new GroupedSelectListItem() { Value = "audi", Text = "Audi", GroupName = "German Cars", GroupKey = "2",Selected = true }};
        ViewBag.item  = item;
        return View();
    }

并在视图中

    <div class="form-group">
        <label for="class_id" class="col-sm-2 control-label">Classe</label>
        <div class="col-sm-10">

    @Html.DropDownGroupList("Cars", ViewBag.item, "-- Select Car --", new Dictionary<string, object>() { { "data-val", "true" }, { "data-val-required", "The Car field is required." } })

         </div

我正在尝试使用viewbag将IEnumerable传递给视图但它不起作用我是.net编程新手，谢谢你

Answer 1

简单地添加模型并像这样使用它

Index.cshtml

@model IList<GroupedSelectListItem>

@{
    ViewBag.Title = "Index";

}

@using (Html.BeginForm())
{
    @Html.DropDownGroupList("Cars",Model, "-- Select Car --", new Dictionary<string, object>() { { "data-val", "true" }, { "data-val-required", "The Car field is required." } })

}

HomeController.cs

public class HomeController : Controller
{
    //
    // GET: /Home/

    public ActionResult Index()
    {
        var item = new List<GroupedSelectListItem> {
    new GroupedSelectListItem() { Value = "volvo", Text = "Volvo", GroupName = "Swedish Cars", GroupKey = "1", Disabled = true },
    new GroupedSelectListItem() { Value = "saab", Text = "Saab",GroupName = "Swedish Cars", GroupKey = "1" },
    new GroupedSelectListItem() { Value = "mercedes", Text = "Mercedes", GroupName = "German Cars", GroupKey = "2" },
    new GroupedSelectListItem() { Value = "audi", Text = "Audi", GroupName = "German Cars", GroupKey = "2",Selected = true }};
        return View(item);
    }

    [HttpPost]
    public ActionResult Index(FormCollection formCollection)
    {


        return View();
    }

}

如何使用Grouped SelectListItem mvc

1 个答案: