Asp. NET how to display files using the TreeView _ Practical Tips

The example in this article tells you how ASP.net uses the TreeView to display files, and is a very useful technique. Share to everyone for your reference. The implementation methods are as follows:

The TreeView is commonly used in asp.net, and here's a detailed account of how you use the TreeView to display files.

1. Add the TreeView control First:

<asp:treeview id= "Driverinfoview" runat= "imageset=" Xpfileexplorer "ontreenodepopulate=" DriverInfoView_ Treenodepopulate "> 
     
</asp:TreeView> 

2. When the page is loaded, write down the following code:

protected void Page_Load (object sender, EventArgs e) 
{ 
    foreach (DriveInfo driverinfo in Driveinfo.getdrives ()) c3/>{ 
      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 + "(Not ready yet)"; 
      } 
      THIS.DRIVERINFOVIEW.NODES.ADD (NewNode); 
    } 
 

3. Set events for the TreeView node:

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); 
    } 

It is believed that the example mentioned in this article has certain reference value for the ASP.net program design.