.net Treeview无限级无刷新示例

＜%@ Page Language="C#" %＞
＜%@ Import Namespace="System.IO" %＞

＜!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"＞

＜script runat="server"＞

void Treeview1_TreeNodePopulate(object sender, TreeNodeEventArgs e)
{
if (IsCallback)
if (e.Node.ChildNodes.Count == 0)
{
LoadChildNode(e.Node);
}

}

private void LoadChildNode(TreeNode node)
{

DirectoryInfo directory;
directory = new DirectoryInfo(node.Value);

foreach (DirectoryInfo sub in directory.GetDirectories())
{

TreeNode subNode = new TreeNode(sub.Name);
subNode.Value = sub.FullName;

try
{
if (sub.GetDirectories().Length ＞ 0 　　 sub.GetFiles().Length ＞ 0)
{
subNode.SelectAction = TreeNodeSelectAction.SelectExpand;
subNode.PopulateOnDemand = true;
subNode.NavigateUrl = "#";
}
}
catch { subNode.ImageUrl = "WebResource.axd?a=sr=TreeView_XP_Explorer_ParentNode.gif&t=632242003305625000"; }
node.ChildNodes.Add(subNode); 
 }

　foreach (FileInfo fi in directory.GetFiles())
{
TreeNode subNode = new TreeNode(fi.Name);
node.ChildNodes.Add(subNode);
}
}


＜/script＞

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＜html xmlns="http://www.w3.org/1999/xhtml" ＞
＜head runat="server"＞
＜title＞Untitled Page＜/title＞
＜/head＞

＜body bgcolor="white"＞
＜form id="form1" runat="server"＞
＜div＞
＜asp:treeview ID="Treeview1" runat="server" ImageSet="XPFileExplorer" AutoGenerateDataBindings="false" ExpandDepth=0
OnTreeNodePopulate="Treeview1_TreeNodePopulate"
＞
＜SelectedNodeStyle BackColor="#B5B5B5"＞＜/SelectedNodeStyle＞
＜Nodes＞
＜asp:TreeNode Value="C:" Text="C:" PopulateOnDemand="true" SelectAction="Select" NavigateUrl="#" ＞
＜/asp:TreeNode＞
＜/Nodes＞
＜NodeStyle VerticalPadding="2" Font-Names="Tahoma" Font-Size="8pt" HorizontalPadding="2"
ForeColor="Black"＞＜/NodeStyle＞
＜HoverNodeStyle Font-Underline="True" ForeColor="#6666AA"＞＜/HoverNodeStyle＞
＜/asp:treeview＞
＜/div＞
＜/form＞
＜/body＞
＜/html＞

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