Asp.net 2.0 Treeview确无刷新示例

 

<% @ 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=s&r=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 >

< 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 >