Customizing the TreeView to allow multi select

Question

The built-in WPF TreeView control does not allow for multi selection, like a ListBox does. How can I customize the TreeView to allow for multi selection without rewriting i

Answer 1

I've simplified this task adding a checkbox before the text for each treeviewitem.

So, I've created a dockpanel with 2 items inside: checkbox + textblock.

So...

XAML

CS

TreeViewItem treeViewItem = new TreeViewItem();
DockPanel dp = new DockPanel();
CheckBox cb = new CheckBox();
TextBlock tb = new TextBlock();
tb.Text = "Item";
dp.Children.Add(cb);
dp.Children.Add(tb);
treeViewItem.Header = dp;
treeViewItem.Selected += new RoutedEventHandler(item_Selected);
treeView.Items.Add(treeViewItem);

And then you can access checkbox value:

void item_Selected(object sender, RoutedEventArgs e)
{
  selectedTVI = ((TreeViewItem)sender);

  CheckBox cb = (Checkbox)((DockPanel)selectedTVI.Header).Children[0];
}

This is a simple way to do if you don't need anything complex.