ASP.NET TreeView读取数据库实例
前台：
<%@ page language="c#" autoeventwireup="true" codebehind="default.aspx.cs" inherits="treeview._default" %>
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:treeview id="treeview1" runat="server" showlines="true">
</asp:treeview>
</div>
</form>
</body>
</html>
后台：
using system;
using system.collections.generic;
using system.linq;
using system.web;
using system.web.ui;
using system.web.ui.webcontrols;
using system.data;
using system.data.sqlclient;
using system.configuration;
namespace treeview
{
public partial class _default : system.web.ui.page
{
public static string st = configurationmanager.connectionstrings["sql"].tostring();
private datatable dts=new datatable();
protected void page_load(object sender, eventargs e)
{
if (!ispostback)
{
dts = createtable();
createnode();
}
}
public void createnode()
{
datarow[] dr = dts.select("parentid=0");
if(dr.length>0)
{
foreach(datarow drr in dr)
{
treenode tn = new treenode();
tn.value = drr["menuid"].tostring();
tn.text = drr["menuname"].tostring();
tn.expanded = false;
tn.selectaction = treenodeselectaction.expand;
treeview1.nodes.add(tn);
createchild(tn,dts);
}
}
else
{
treenode t=new treenode();
t.value="空";
t.text="空";
t.expanded=false;
t.selectaction=treenodeselectaction.expand;
treeview1.nodes.add(t);
}
}
public void createchild(treenode tnn, datatable dtt)
{
datarow[] dr = dtt.select("parentid=" + tnn.value);
if (dr.length > 0)
{
foreach (datarow drw in dr)
{
treenode ts = new treenode();
ts.value = drw["menuid"].tostring();
ts.text = drw["menuname"].tostring();
ts.selectaction = treenodeselectaction.expand;
ts.expanded = false;
tnn.childnodes.add(ts);
createchild(ts, dtt);
}
}
}
public datatable createtable()
{
datatable d = new datatable();
using(sqlconnection sql=new sqlconnection(st))
{
sqlcommand sq=new sqlcommand("select * from treeviewname",sql);
sqldataadapter sda=new sqldataadapter();
sda.selectcommand = sq;
sda.fill(d);
}
return d;
}
}
}