WP 8.1滚动到ListView的顶部

Question

I would like to automatically scroll to the top of the ListView when the user navigates to this with the back button. I tried to use this:

scrollViewer.ScrollToVerticalOffset(0.0);

It works, but the VS says:

ScrollToVerticalOffset may be altered or unavailable for releases after Windows 8.1. Instead, use ChangeView.

Okay, I thought it's no problem, I will use ChangeView instead of this. But the ChangeView doesn't work properly. At least in my case. I tried this:

scrollViewer.ChangeView(null, 0d, null);

It works when I call it for example from a button, but it doesn't do anything when I put it to the OnNavigatedTo method.
So why does it work?

Answer 1

If you take a look at MSDN description od OnNavigatedTo , you will see that it's called before the visual tree is loaded. Therefore if you want to manipulate your UI elements - do it in Loaded event:

You cannot use OnNavigatedTo for element manipulation or state change of controls on the destination page. Instead, attach a Loaded event handler at the root of the newly loaded page's content, and perform any element manipulations, state changes, event wiring and so on in the Loaded event handler.