ASP.NET MVC DropDownList 用法

一：Html.DropDownList 数据绑定并选定默认项

1.建立IEnumerable<SelectListItem>并在其中指定默认选中项。

List<SelectListItem> items = new
List<SelectListItem>();

items.Add(new SelectListItem { Text = "Kirin", Value = "29"
});

items.Add(new SelectListItem { Text = "Jade", Value = "28",
Selected = true});

items.Add(new SelectListItem { Text = "Yao", Value =
"24"});

this.ViewData["list"] = items;

然后在View中<%=Html.DropDownList("list")%>即可绑定数据，且选中第二项。

2.建立IEnumerable<SelectListItem>，在单独的ViewData项或view
model的属性中指定默认选中项。

使用SelectList。

List<SelectListItem> items = new
List<SelectListItem>();

items.Add(new SelectListItem { Text = "Kirin", Value = "29"
});

items.Add(new SelectListItem { Text = "Jade", Value =
"28"});

items.Add(new SelectListItem { Text = "Yao", Value =
"24"});

this.ViewData["list"] = items;

this.ViewData["selected"] = 24;

3.使用SelectList。

var users = GetUsers();

var selectList = new SelectList(users, "Age", "Name",
"24");

this.ViewData["list"] = selectList;

<%=Html.DropDownList("list")%>

4.

List<SelectListItem> lsSelItem = new
List<SelectListItem>();

SelectListItem sel = new
SelectListItem();

sel.Value = "http://www.csdn.net";

sel.Text = "CSDN";

lsSelItem.Add(sel);

sel = new
SelectListItem();

sel.Value = "http://www.nopchina.com";

sel.Text = "NopChina";

lsSelItem.Add(sel);

sel = new
SelectListItem();

sel.Value = "http://blog.csdn.net/csdbfans";

sel.Text = "Csdbfans
BLOG";

lsSelItem.Add(sel);

SelectList ddlSelData = new SelectList(lsSelItem.AsEnumerable(),
"Value", "Text", "http://www.cnblogs.com");

ViewData["ddlTestData"] = ddlSelData;

<%=Html.DropDownList("ddlTest",ViewData["ddlTestData"] as SelectList) %>

摘自 http://blog.sina.com.cn/s/blog_69cfe5430100o2me.html