Comments on: TreeView and ObservableCollection weird bug

By: How to Get Six Pack Fast

How to Get Six Pack Fast — Wed, 15 Apr 2009 17:58:49 +0000

This is quite a up-to-date information. I’ll share it on Digg.

Anthony — Thu, 01 Jan 2009 08:10:40 +0000

This workaround provides 4 collectionchanged events. Don’t know if this will help anybody.

Tamir Khason — Thu, 01 Jan 2009 08:10:38 +0000

Thank you, Anthony. I’ve updated the article

vibhor — Thu, 01 Jan 2009 08:10:36 +0000

That code works like a charm!! Thanks a ton.

Fedir Nepyivoda — Thu, 01 Jan 2009 08:10:34 +0000

This workaround has the side effect: the state of tree view items are lost (if they was expended, for example).

The better solution is to subclass TreeView and TreeViewItem. Then override OnItemsChanged in both classes and do nothing.

Like this:

public class MyTreeView : TreeView

{

protected override void OnItemsChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e)

{

// do nothing

}

protected override DependencyObject GetContainerForItemOverride()

{

return new MyTreeViewItem();

}

public class MyTreeViewItem : TreeViewItem

{

protected override void OnItemsChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e)

{

// do nothing

}