asp.net-mvc - 将选定的 DropDown 值传递给 Controller

Question

我的 View 上有一个 DropDownList 和一个按钮。单击按钮时，我想将选定的 DropDown 值传递给 Controller ​​。如何做到这一点？

查看代码如下:

@model Sample2.Models.LeaveType
@{
    ViewBag.Title = "Status of Application";
}

@{
    List<SelectListItem> listItems = new List<SelectListItem>();
    listItems.Add(new SelectListItem
         {
             Text = "All",
             Value = "A",
             Selected = true
         });
    listItems.Add(new SelectListItem
         {
             Text = "Recommended",
             Value = "R"
         });
    listItems.Add(new SelectListItem
         {
             Text = "Sanctioned",
             Value = "S"
         });
}

<table>
    <tr>
        <td>
            @Html.DropDownListFor(model => model.LeaveType1, listItems, "-- Select Status --")
        </td>
        <td>
            @using (Html.BeginForm("Index", "Home", FormMethod.Get))
            {
                <input type="submit" value="Show" />
            }
        </td>
    </tr>
</table>

Controller 代码如下:

    public ActionResult Index(string Id)
    {
        using (var context = new Admin_TestEntities())
        {
            var data = context.Leave_GetDetails(Id).ToList();
            return View(data.AsEnumerable().ToList());
        }

    }

** 已编辑 **

根据建议，我更改了代码，如下所示，它正在工作:

        @using (Html.BeginForm("Index", "Home", FormMethod.Post))
        {
            @Html.DropDownList("Id", listItems)
            <input type="submit" value="Show" />
        }

Answer 1

你可以这样做:

[Post]
public ActionResult Index(string fromList)
{
    ...
}

View 可能看起来像这样:

<div>
@Html.BeginForm("Index", "Home", FormMethod.Post)
{
     @Html.DropDownListFor(model => model.LeaveType1, listItems, "-- Select Status --")
     <input type="submit" />
}
</div>