WPF: how do i handle a click on a ListBox item?

问题

In my WPF app I'm handling a ListBox SelectionChanged event and it runs fine.

Now I need to handle a click event (even for the already selected item); I've tried MouseDown but it does not work. How can I handle a ListBox click on an item?

回答1:

Just handle PreviewMouseDown event:

private void listBox_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
    var item = ItemsControl.ContainerFromElement(listBox, e.OriginalSource as DependencyObject) as ListBoxItem;
    if (item != null)
    {
        // ListBox item clicked - do some cool things here
    }
}

回答2:

Perhaps try the PreviewMouseDown event. The MouseDown event gets swallowed and converted to the SelectionChanged event.

Only downside is that the PreviewMouseDown will occur before the SelectionChanged.

回答3:

Listbox internally uses the mouse down to perform selection changed. So you can use preview mouse down event.

Apart from preview mouse down, you can use EventManager.RegisterClassHandler...

     EventManager.RegisterClassHandler(typeof(ListBoxItem), ListBoxItem.MouseLeftButtonDownEvent, new RoutedEventHandler(EventBasedMouseLeftButtonHandler));

     private static void EventBasedMouseLeftButtonHandler(object sender, RoutedEventArgs e)
     {
     }

Let me know if this helps...

来源：https://stackoverflow.com/questions/6938752/wpf-how-do-i-handle-a-click-on-a-listbox-item