滚动到以前选择的ListBox项

Question

I am having trouble setting the Selected Item of a Listbox I am populating and adding to the LayoutRoot 's children in code.

I am creating the ListBox over when going back to the page, so I am saving a variable which will tell me what the selected item was before the user clicked.

I tried setting SelectedIndex , but that did not seem to work. That selects the item and calls SelectionChanged, but the item does not come into focus.

I also tried the combination of MyListBox.ScrollIntoView(MyListBox.Items[MyListBox.SelectedIndex]) and MyListBox.UpdateLayout() , but that did not seem to work either. The item does not seem to come into focus.

Answer 1

Try MyListBox.SelectedItem.EnsureVisible() .

(If it doesn't have SelectedItem ( ListBox on the desktop CLR doesn't), then use SelectedItems[0] instead)

E: Okay, looks like Windows Phone doesn't support that. However, it does support MyListBox.EnsureVisible(MyListBox.SelectedItems[0])

Answer 2

I ended up fixing this by Adding the UserControl that had the ListBox into the Page's XAML, and the ListBox into the UserControl's XAML.

Then, I was able to use the ScrollIntoView(MyListBox.Items[mySavedSelectedItem]);

I simply saved this value when the user made the selection.

mySavedSelectedItem = ((ListBox)sender).SelectedIndex;