Using a TreeView to display the directory structure : TreeView « GUI « VB.Net Tutorial






Using a TreeView to display the directory structure
Imports System.IO
Imports System.Windows.Forms

public class FileTreeView
   public Shared Sub Main
        Application.Run(New FrmTreeViewDirectory)
   End Sub
End class


Public Class FrmTreeViewDirectory
   Inherits Form

#Region " Windows Form Designer generated code "

   Public Sub New()
      MyBase.New()

      'This call is required by the Windows Form Designer.
      InitializeComponent()

      'Add any initialization after the InitializeComponent() 
      'call

   End Sub

   'Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
      If Disposing Then
         If Not (components Is Nothing) Then
            components.Dispose()
         End If
      End If
      MyBase.Dispose(Disposing)
   End Sub

   ' contains view of c: drive directory structure
   Friend WithEvents treDirectory As System.Windows.Forms.TreeView

   'Required by the Windows Form Designer
   Private components As System.ComponentModel.Container

   'NOTE: The following procedure is required by the Windows Form Designer
   'It can be modified using the Windows Form Designer.  
   'Do not modify it using the code editor.
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
      Me.treDirectory = New System.Windows.Forms.TreeView()
      Me.SuspendLayout()
      '
      'treDirectory
      '
      Me.treDirectory.Dock = System.Windows.Forms.DockStyle.Fill
      Me.treDirectory.ImageIndex = -1
      Me.treDirectory.Name = "treDirectory"
      Me.treDirectory.SelectedImageIndex = -1
      Me.treDirectory.Size = New System.Drawing.Size(296, 293)
      Me.treDirectory.TabIndex = 0
      '
      'FrmTreeViewDirectory
      '
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(296, 293)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.treDirectory})
      Me.Name = "FrmTreeViewDirectory"
      Me.Text = "TreeViewDirectoryStructure"
      Me.ResumeLayout(False)
   End Sub

#End Region

   Public Sub PopulateTreeView(ByVal directoryValue As String, _
      ByVal parentNode As TreeNode)

      Dim directoryArray As String() = Directory.GetDirectories(directoryValue)

      If directoryArray.Length <> 0 Then 
         Dim currentDirectory As String

         For Each currentDirectory In directoryArray
            Dim myNode As TreeNode = New TreeNode(currentDirectory)
            parentNode.Nodes.Add(myNode)
'            PopulateTreeView(currentDirectory, myNode)
         Next

      End If
   End Sub 

   Private Sub FrmTreeViewDirectory_Load(ByVal sender As Object, _
      ByVal e As System.EventArgs) Handles MyBase.Load
      treDirectory.Nodes.Add("C:")
      PopulateTreeView("C:\", treDirectory.Nodes(0))
   End Sub

End Class








14.42.TreeView
14.42.1.Creating Tree Views in CodeCreating Tree Views in Code
14.42.2.Add and remove tree nodesAdd and remove tree nodes
14.42.3.Build file tree recursivelyBuild file tree recursively
14.42.4.Using a TreeView to display the directory structureUsing a TreeView to display the directory structure
14.42.5.Tree Node selection eventTree Node selection event
14.42.6.TreeView CheckBoxTreeView CheckBox