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How to select all the leaf nodes of the parent node in WinForms TreeViewAdv?

Platform: WinForms |
Control: TreeViewAdv |
Published Date: April 30, 2011 |
Last Revised Date: February 6, 2020

AfterSelect event

We can select all the leaf nodes of the parent node by just selecting the parent node by handling the AfterSelect Event handler.

C#

private void treeViewAdv1_AfterSelect(object sender, System.EventArgs e)
{
   TreeNodeAdvCollection tn = new TreeNodeAdvCollection();
   foreach (TreeNodeAdv n in this.treeViewAdv1.SelectedNodes)
   {
      this.AddChildren(tn, n);
   }
   foreach (TreeNodeAdv n in tn)
   {
      this.treeViewAdv1.SelectedNodes.Add(n);
   }
}
private void AddChildren(TreeNodeAdvCollection tn, TreeNodeAdv n)
{
   foreach (TreeNodeAdv child in n.Nodes)
   {
      tn.Add(child);
      this.AddChildren(tn, child);
   }
}

VB

Private Sub treeViewAdv1_AfterSelect(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim tn As TreeNodeAdvCollection = New TreeNodeAdvCollection()
    For Each n As TreeNodeAdv In Me.treeViewAdv1.SelectedNodes
       Me.AddChildren(tn, n)
    Next n
    For Each n As TreeNodeAdv In tn
       Me.treeViewAdv1.SelectedNodes.Add(n)
    Next n
End Sub
Private Sub AddChildren(ByVal tn As TreeNodeAdvCollection, ByVal n As TreeNodeAdv)
    For Each child As TreeNodeAdv In n.Nodes
        tn.Add(child)
        Me.AddChildren(tn, child)
    Next child
End Sub

Reference link: https://help.syncfusion.com/windowsforms/treeview/treenodeadvcustomization#afterselect-event

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