ASP.NET uses TreeView's method of displaying files

This article shows how ASP.NET uses TreeView to display files, which is a very useful technique. Share with you for your reference. The specific implementation method is as follows:

TreeView is commonly used in ASP.NET. Here's how to display files using TreeView in detail.

1. First add TreeView control:

<asp:TreeView ID="driverInfoView" runat="server" ImageSet="XPFileExplorer" OnTreeNodePopulate="driverInfoView_TreeNodePopulate"> 
     
</asp:TreeView> 

2. When the page loads, write the following code:

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 + "( I'm not ready )"; 
      } 
      this.driverInfoView.Nodes.Add(newNode); 
    } 
} 

3. Set TreeView node events:

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); 
    } 
}

I believe that the examples described in this paper are of reference value to asp.net program design.