TreeView does not show selected node!

[Mark F]

First of all, I have HideSelection set to false. I implemented drag and drop in a TreeView so that the indexed cards in the tree can be moved manually (cards store book info like Library card files). An XML file is updated with the newly arranged tree. The TreeView is refreshed in the Drag_Drop event, but the SelectedNode does not show! Is there a workaround for this? Here's the code...,

private void cardsTreeView_DragDrop( object sender, DragEventArgs e )
{
    nodePosition.X = e.X;
    nodePosition.Y = e.Y;
    nodePosition = cardsTreeView.PointToClient(nodePosition);

    TreeNode dropNode = cardsTreeView.GetNodeAt(nodePosition);

    if (dropNode != null && dropNode.Parent == this.nodeToDelete.Parent)
    {
        TreeNode dragNode = this.nodeToDelete;
        
        if (dropNode == dragNode)
            return;

        dropNode.Parent.Nodes.Remove(this.nodeToDelete);
        dropNode.Parent.Nodes.Insert(dropNode.Index + 1, dragNode);

        Cards.MoveCardTo(GetIndexString(dropNode), GetIndexString(nodeToDelete));
        Cards.ReOrderCards();

        if (cardsTreeView.Nodes.Count > 0)
            cardsTreeView.Nodes.Clear();

        cardsTreeView.BeginUpdate();

        // load all cards from XML document
        Cards.GetAllCards(ref cardsTreeView);

        cardsTreeView.EndUpdate();
        cardsTreeView.ExpandAll();
       
        cardsTreeView.EndUpdate();
        
        // Fails to show the selected node 
        cardsTreeView.SelectedNode = cardsTreeView.Nodes[dropNode.Index];
        cardsTreeView.SelectedNode.EnsureVisible();
    }
}

private void cardsTreeView_DragEnter( object sender, DragEventArgs e )
{
    if(e.Data.GetDataPresent(DataFormats.Text))
        e.Effect = DragDropEffects.Move;
    else
        e.Effect = DragDropEffects.None;
}

private void cardsTreeView_ItemDrag( object sender, ItemDragEventArgs e )
{
    nodeToDelete = (TreeNode) e.Item;
    string strItem = e.Item.ToString();
    DoDragDrop(strItem, DragDropEffects.Copy | DragDropEffects.Move);
}

Thanks, Mark

[Mark Churchill]

Give this a try. I've noticed that some properties don't seem to update until they are rendered (bad form IMO). // Fails to show the selected node cardsTreeView.SelectedNode = cardsTreeView.Nodes[dropNode.Index]; cardsTreeView.Nodes[dropNode.Index].EnsureVisible();

Mark Churchill Director Dunn & Churchill

[Mark F]

Sorry, but I don't understand your reply. You posted the code that I already have in my project. Mark

[Mark Churchill]

Ah not quite. Where you set the tree.SelectedNode to someNode, and then called EnsureVisible on tree.SelectedNode , I set the tree.SelectedNode and then called EnsureVisible on someNode. It might not seem like theres actually a difference, but I have noticed sometimes you can set properties on some of the web controls and they don't come back out correctly until they are rendered. Ie the following code fails:

someTree.selectedNode = someNode;
assert(someTree.selectedNode == someNode);

Odd, I know, but theres no harm trying it.

Mark Churchill Director Dunn & Churchill

[Mark F]

Well I tried your suggestion and the TreeView still does not scroll to the selected node and show it as selected. Must be a bug in the TreeView control. Thanks for the assistance. Mark