WPF ListView - Getting the Clicked Item

I recently had the need to figure out which item in a WPF ListView was under the mouse when it was clicked. The solution wasn't completely straightforward, so I thought I'd post it here.

First, obviously you need to register a mouse button event hander in your control initialization. In this case, I'm using a double-click event:

MyListView.MouseDoubleClick += new MouseButtonEventHandler(MyListView_MouseDoubleClick);

and then implement the event handler like such:

void MyListView_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
   DependencyObject dep = (DependencyObject)e.OriginalSource;

   while ((dep != null) && !(dep is ListViewItem))
   {
       dep = VisualTreeHelper.GetParent(dep);
   }

   if (dep == null)
        return;

   MyDataItemType item = (MyDataItemType)MyListView.ItemContainerGenerator.ItemFromContainer(dep);

   // Do something with the item...
}

What we are doing is walking up the visual tree starting at the element the generated the mouse event. We stop when we find a ListViewItem, which we can then use to get the corresponding data item. If all you want is the index of the item, use IndexFromContainer() instead.