WPF: Filter TreeView without collapsing it's nodes

Posted by Julian Lettner on Stack Overflow See other posts from Stack Overflow or by Julian Lettner
Published on 2010-04-23T16:41:32Z Indexed on 2010/04/23 16:43 UTC
Read the original article Hit count: 1342

Filed under:

wpf

|

treeview

|

filter

This one is a follow-up question.

I filter the top level nodes of a TreeView control like shown below.

private void ApplyFilterHandler(object sender, RoutedEventArgs e)
{
    if (_filterCheckBox.IsChecked.Value)
        CollectionViewSource.GetDefaultView(TopLevelNodes).Filter += MyFilter;
    else
        CollectionViewSource.GetDefaultView(TopLevelNodes).Filter -= MyFilter;
}

.

<TreeView ItemsSource="{Binding TopLevelNodes}">
  ...
</TreeView>

When the user applies the filter all nodes get collapsed.

Question
How can I hide certain nodes in a tree while retaining the expand state of the other nodes?
Can someone explain, what happens internally on ICollectionView.Filter += MyFilter.

Thanks for your time.

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