UWP Get selected nodes from TreeView control

How do you get the currently highlighted/selected node from a TreeView control? Based on the documentation here it should be possible to iterate through the control's SelectedNodes property but its always empty.


EDIT: This turns out to be an actual bug with XAML, tracked here. Until it's fixed, the accepted answer does fine as work-around.


Context: I'm working on a simple demo application to explore the TreeView control. I'm trying to add a keyboard shortcut to delete the currently active/selected node. I have the delete functionality in a RelayCommand class that implements ICommand. I have already gotten it working from the TreeViewItem DataTemplate as a button and as a flyout menu. I couldn't see a clean way to reuse the ICommand in a keyboard shortcut.

Image of the app with the last-clicked item highlighted; I need to access this TreeViewItem in the code-behind so I can delete it when the TreeView has focus and the "Delete" key is pressed. TreeViewExample

I have an event handler on the TreeView control:

<controls:TreeView x:Name="TreeDataBound"
    ItemsSource="{Binding Path=TreeSource, Mode=TwoWay}"
    ItemTemplateSelector="{StaticResource TreeItemTemplateSelector}"
    SelectionMode="Single"
    KeyDown="Tree_KeyDown">

The event handler should be looping through the selected nodes, although I think with SelectionMode="Single" the enumerable should only have one item.

private void Tree_KeyDown(object sender, KeyRoutedEventArgs e)
{
    if (e.Key == Windows.System.VirtualKey.Delete)
    {
        foreach (var element in TreeDataBound.SelectedNodes)
        {
            // Delete the item 
        }
    }
}

SelectedNodes appears to always be empty, even when one of the TreeView iems is highlighted. In the debugger SelectedNodes appears as type of System.__ComObject with no accessible properties, so I can't inspect it any further.

Any thoughts or suggestions for a better approach?



Read more here: https://stackoverflow.com/questions/56766785/uwp-get-selected-nodes-from-treeview-control

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