ASP.NET中使用TreeView显示文件的方法

<asp:treeview id="driverinfoview" runat="server" imageset="xpfileexplorer" ontreenodepopulate="driverinfoview_treenodepopulate">
</asp:treeview>

protected void page_load(object sender, eventargs e) 
{ 
foreach (driveinfo driverinfo in driveinfo.getdrives()) 
{ 
treenode newnode = new treenode(); 
newnode.expanded = false; 
newnode.populateondemand = true; 
newnode.value = driverinfo.name; 

if (driverinfo.isready) 
{ 
newnode.text = driverinfo.name + "(" + driverinfo.volumelabel + ")"; 
} 
else 
{ 
newnode.text = driverinfo.name + "(还没准备好)"; 
} 
this.driverinfoview.nodes.add(newnode); 
} 
}

protected void driverinfoview_treenodepopulate(object sender, treenodeeventargs e) 
{ 
directoryinfo dictinfo = new directoryinfo(e.node.value); 

foreach (directoryinfo directory in dictinfo.getdirectories()) 
{ 
treenode newnode = new treenode(); 
newnode.expanded = false; 
newnode.populateondemand = true; 
newnode.text = directory.name; 
newnode.value = directory.fullname; 
e.node.childnodes.add(newnode); 
} 

foreach (fileinfo fileinfo in dictinfo.getfiles()) 
{ 
treenode newnode = new treenode(); 
newnode.text = fileinfo.name; 
newnode.value = fileinfo.fullname; 
e.node.childnodes.add(newnode); 
}
}