c# - 无法将 View 数据下拉列表的选定值获取到我的 Controller 操作？

Question

我无法将 DropDownList 的选定值传送到我的 Controller 。我搜索的字符串传递给了 Controller ，但是下拉列表的选择值没有。

Controller

public ActionResult Index()
{
    List<SelectListItem> items = new List<SelectListItem>();
    items.Add(new SelectListItem { Text = "Movies", Value = "0", Selected = true });
    items.Add(new SelectListItem { Text = "Tv Seires", Value = "1" });
    items.Add(new SelectListItem { Text = "Cast", Value = "2" });
    items.Add(new SelectListItem { Text = "All", Value = "3" });
    ViewData["Options"] = items;
    return View();
}

查看

<div class="input-group">
    <div class="input-group-btn search-panel">
        @Html.DropDownList("Options",ViewData["Options"]as SelectList, new { @class = "btn btn-secondary dropdown-toggle", @id = "search_dropdown" })
    </div>
    @Html.TextBoxFor(m => m.searchValue,new{htmlAttributes = new {@class = "form-control", @id="search_input",placeholder="Search term..."}})
    <span class="input-group-btn">
        <input type="submit" value="&#x1f50d;" class="btn btn-secondary" id="search_button" />
    </span>
</div>

Answer 1

考虑将其放入表单中:

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    @Html.DropDownList("Options",ViewData["Options"]as SelectList, new { @class = "btn btn-secondary dropdown-toggle", @id = "search_dropdown" })

    @Html.TextBoxFor(m => m.searchValue,new{htmlAttributes = new {@class = "form-control", @id="search_input",placeholder="Search term..."}})

    <input type="submit" value="&#x1f50d;" class="btn btn-secondary" id="search_button" />
}