Update 2007-10-26: I think I’ve fixed it now. Note I haven’t properly implemented SelectItem() yet. I also want to do a better test control in the ControlsTester application for the tree view.
Update 2007-10-25: Yeah um….there’s some bugs. The code is pretty messy and I only looked at it quickly and it seems my fix broke something. I’ll have another look tomorrow.
Note: I’ve looked over the tree view code I wrote a while back and it’s not very robust, so there’s probably some problems. E.g. you can’t select sub nodes programatically. Still here’s the details:
I’ve done some updates to my TreeViewMultiSelect control. It’s now part of a sourceforge repository located here:
https://stewienmisc.svn.sourceforge.net/svnroot/stewienmisc/SourceCode
The specific files TreeViewMultiSelect and TreeViewItemMultiSelect are here:
https://stewienmisc.svn.sourceforge.net/svnroot/stewienmisc/SourceCode/WPF/Controls/
and there is a test control called TreeViewTester located here:
https://stewienmisc.svn.sourceforge.net/svnroot/stewienmisc/SourceCode/WPF/ControlsTest/
I haven’t done a release package of everything, but you can checkout using Subversion from this directory:
https://stewienmisc.svn.sourceforge.net/svnroot/stewienmisc/
Then in the SourceCode directory there is a Visual Studio 2005 solution. Run the Stewien.WPF.ControlsTest app and on the last tab is a quick and dirty app to play around with the tree view control.
John Stewien's Road To Somewhere Else 
thanks! I searched so long for this.Just one question: In my project, I\’m filling the treeview with "Themes", which have a collection of "Facts" . the Datacontext of some items is a Fact, now i need some facts to be invisible (visibility.collapsed, It has to be possible to set this to visible later on by selecting them in another list) . Is there a way to iterate over al the treeviewitems and search an individual TreeViewItemMultiSelect, so I can check it\’s datacontext ?thanks in advanceJoachim
Thanks John for making your code available. Yours is the only WPF TreeView multi-selection solution out of many online that actually worked. Cheers!
Thanks, realy good solution.
That part with using dictionary itemToTreeViewItem where is comment:
// Not real happy with this solution.
can be replaced with
public void DeselectItem(object itemToDeselect)
{
TreeViewItemMultiSelect treeViewItem = (TreeViewItemMultiSelect)(this.ItemContainerGenerator.ContainerFromItem(itemToDeselect));
if (treeViewItem != null)
{
// TreeViewItemMultiSelect treeViewItem = itemToTreeViewItem[itemToDeselect]; //not needed
treeViewItem.IsSelected = false;
if (selectedTreeViewItems.Contains(treeViewItem))
{
selectedTreeViewItems.Remove(treeViewItem);
}
}
}
so you don’t need
private Dictionary itemToTreeViewItem;
any more
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