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