我看到您正在使用带有runat="server"
和asp:XXX
网页控件的表单。这些概念不应该在ASP.NET MVC中使用。这些服务器控件所依赖的没有更多的ViewState和PostBacks。
所以在ASP.NET MVC你会通过定义表示数据视图模型开始:
public class ItemsViewModel
{
public string SelectedItemId { get; set; }
public IEnumerable<SelectListItem> Items { get; set; }
}
那么就需要定义有两个动作(一个呈现视图控制器和另一个手柄表单提交):
public class HomeController : Controller
{
public ActionResult Index()
{
var model = new ItemsViewModel
{
Items = new[]
{
new SelectListItem { Value = "Theory", Text = "Theory" },
new SelectListItem { Value = "Appliance", Text = "Appliance" },
new SelectListItem { Value = "Lab", Text = "Lab" }
}
};
return View(model);
}
[HttpPost]
public ActionResult Index(ItemsViewModel model)
{
// this action will be invoked when the form is submitted and
// model.SelectedItemId will contain the selected value
...
}
}
最后你会写相应的强类型Index
观点:
<%@ Page
Language="C#"
MasterPageFile="~/Views/Shared/Site.Master"
Inherits="System.Web.Mvc.ViewPage<AppName.Models.ItemsViewModel>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Home Page
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<% using (Html.BeginForm()) { %>
<%= Html.DropDownListFor(x => x.SelectedItemId, new SelectList(Model.Items, "Value", "Text")) %>
<input type="submit" value="OK" />
<% } %>
</asp:Content>
这是说,你也可以硬编码此选择您的视图中(虽然这是我不会推荐):
<% using (Html.BeginForm()) { %>
<select name="selectedItem">
<option value="Theory">Theory</option>
<option value="Appliance">Appliance</option>
<option value="Lab">Lab</option>
</select>
<input type="submit" value="OK" />
<% } %>
,并具有以下控制器:
public class HomeController : Controller
{
public ActionResult Index()
{
return View();
}
[HttpPost]
public ActionResult Index(string selectedItem)
{
// this action will be invoked when the form is submitted and
// selectedItem will contain the selected value
...
}
}
哪有我使用这个代码var model = new ItemsViewModel { Items = new [] { new SelectListItem {Value =“Theory”,Text =“Theory”}, new Select ListItem {Value =“Appliance”,Text =“Appliance”}, new SelectListItem {Value =“Lab”,Text =“Lab”} } };如果我想从数据库中获取下拉列表的值。请给我建议我该怎么做,如果我从数据库中取值,那么我将使用哪些代码? – 2011-06-13 01:26:59