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Martin Paul Eve

Professor of Literature, Technology and Publishing at Birkbeck, University of London

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Expanding a treeview to a specific node in WPF

I've been exploring the dark alleyways of the Windows Presentation Foundation this week and found no way in my trawlings of the net to expand a treeview to a specific node.

No FindNode, no ExpandTo or ExpandAll. Great.

Anyway, here's the solution I came up with. It relies upon a binding the Tag property to the text you are searching for, but that could obviously be changed.

/// <summary>
        /// Expand a TreeView to a specific node
        /// </summary>
        /// <param name="tv">The treeview</param>
        /// <param name="node">The string of the node in the Item.Tag property to expand to</param>
        void jumpToFolder(TreeView tv, string node)
        {
            bool done = false;
            ItemCollection ic = tv.Items;

            while (!done)
            {
                bool found = false;

                foreach (TreeViewItem tvi in ic)
                {    
                    if (node.StartsWith(tvi.Tag.ToString()))
                    {
                        found = true;
                        tvi.IsExpanded = true;
                        ic = tvi.Items;
                        if (node == tvi.Tag.ToString()) done = true;
                        break;
                    }
                }

                done = (found == false && done == false);
            }
        }