WPF TreeView File System C#

WPF TreeView File System C#

 

 Step 1)  Add TreeView to XAML

 <TreeView   ScrollViewer.IsDeferredScrollingEnabled="True" 
                    ScrollViewer.VerticalScrollBarVisibility="Auto"
                    x:Name="TreeView1"
                    HorizontalAlignment="Left" Height="287"
                    VerticalAlignment="Top" Width="489"
                    Margin="10,5,0,0" ToolTip="File System in WPF TreeView"
                    Grid.Row="01" Grid.Column="0"
                     BorderBrush="Beige" BorderThickness="1">
        </TreeView>

Step 2)  Add Root Node Called "Computer"

              note: This is the Root Node for the Tree,Logical Drives added below child nodes

Step 3) Get Logical Drives in the System from Environment class.

           Note: For Removable Drives , need to check IsReady

 void TreeViewDemo_Loaded(object sender, RoutedEventArgs e)
        {
            TreeViewItem root = new TreeViewItem() { Header = "Computer" };
            TreeView1.Items.Add(root);
            root.Foreground = new SolidColorBrush(Colors.BlueViolet);
            foreach (String LogicalDrives in System.Environment.GetLogicalDrives())
            {
                System.IO.DriveInfo dInfo = new System.IO.DriveInfo(LogicalDrives);

               
                TreeViewItem subItems = new TreeViewItem();
                subItems.Foreground = new SolidColorBrush(Colors.Gold);
                subItems.Header = LogicalDrives + ((dInfo.IsReady)?dInfo.VolumeLabel:String.Empty);
                root.Items.Add(subItems);
                if(dInfo.IsReady)
                GetFilesandFolder(subItems,LogicalDrives);
            }
        }

Step 4) Get Files and Folders of each(top level only) Logical Drives

        void GetFilesandFolder(TreeViewItem root,String rootdir)
        {
            AddSubFolderandFiles(root,rootdir);
        }

       void AddSubFolderandFiles(TreeViewItem root,String rootDir)
        {
           
            foreach (String dir in System.IO.Directory.GetDirectories(rootDir))
            {
                try
                {
                   
                    TreeViewItem subFolderItem = new TreeViewItem();
                    subFolderItem.Header = System.IO.Path.GetFileName(dir);
                    subFolderItem.Items.Add("");
                    subFolderItem.Expanded +=subFolderItem_Expanded;
                    subFolderItem.Tag = dir;
                    root.Items.Add(subFolderItem);

                    subFolderItem.Foreground = new SolidColorBrush(Colors.Gold);
                }
                catch (Exception ex)
                {
                    continue;
                }
            }

            foreach (String file in System.IO.Directory.GetFiles(rootDir))
            {
                TreeViewItem item = new TreeViewItem();
                item.Header = System.IO.Path.GetFileName(file);
                item.Foreground = new SolidColorBrush(Colors.Green);
                root.Items.Add(item);
                       
            }
       }

 Step 5)  Once Top Level Directories and Files are Added , Whenever user clicks/expands on Sub folder, at that time sub folder files & folder will be added to TreeView.

     void subFolderItem_Expanded(object sender, RoutedEventArgs e)
       {

           TreeViewItem root = sender as TreeViewItem;

           root.Items.Clear();

           String str = root.Tag as String;

           AddSubFolderandFiles(root, str);

           e.Handled = true;

       }