这个例子是来源于 asp.net start kit。
<%@ Page language="c#" Codebehind="WebForm4.aspx.cs" AutoEventWireup="false" Inherits="localtest.WebForm4" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm4</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<asp:DataList ID="dgTopLevel" Runat="server">
<ItemTemplate>
<asp:LinkButton Runat="server" id="open" CommandName="打开" >open</asp:LinkButton>
<asp:Label Runat="server" ID="lb">这是第一层</asp:Label>
<%# DataBinder.Eval(Container.DataItem,"au_lname") %>
</ItemTemplate>
<SelectedItemTemplate>
<asp:LinkButton Runat="server" ID="close" CommandName="关闭" >close</asp:LinkButton>
<asp:Label Runat="server" ID="lb2">这是第二层</asp:Label>
<asp:DataList Runat="server" ID="dgSub" DataSource="<%# GetSubList() %>">
<ItemTemplate>
<%# DataBinder.Eval(Container.DataItem,"au_fname") %>
</ItemTemplate>
</asp:DataList>
</SelectedItemTemplate>
</asp:DataList>
</form>
</body>
</HTML>
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
namespace localtest
{
/// <summary>
/// WebForm4 的摘要说明。
/// </summary>
public class WebForm4 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataList dgTopLevel;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!IsPostBack)
{
BindList();
}
}
public void Command_select(Object sender,DataListCommandEventArgs e)
{
string command = ((LinkButton)e.CommandSource).CommandName;
if(command == "close")
{
dgTopLevel.SelectedIndex = -1;
}
else
{
dgTopLevel.SelectedIndex = e.Item.ItemIndex;
}
BindList();
}
#region Web 窗体设计器生成的代码
#endregion
void BindList()
{
this.dgTopLevel.DataSource = this.GetTopList();
this.dgTopLevel.DataBind();
}
//第二层的数据源
public SqlDataReader GetSubList()
{
SqlConnection conn = new SqlConnection("server=localhost;uid=sa;pwd=syd8gmt;database=pubs");
string strsql = "select top 5 au_fname from authors";
SqlCommand cmd = new SqlCommand(strsql,conn);
cmd.Connection.Open();
SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return dr;
}
//第一层的数据源
public SqlDataReader GetTopList()
{
SqlConnection conn = new SqlConnection("server=localhost;uid=sa;pwd=syd8gmt;database=pubs");
string strsql = " select top 10 au_lname from authors";
SqlCommand cmd = new SqlCommand(strsql,conn);
cmd.Connection.Open();
SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return dr;
}
}
}
