Windows Phone 7 Tip (6) — 如何恢複離開頁面時的list位置

不廢話，上代碼：）

 

代碼

private double? scrollOffset;

private void scrollViewerHome_SizeChanged(object sender, SizeChangedEventArgs e)
        {
if (scrollOffset.HasValue)
            {
                scrollViewerHome.ScrollToVerticalOffset(scrollOffset.Value);
                scrollOffset = null; // No need to set the scroll offset again
            }  
        }

protected override void OnNavigatedFrom(NavigationEventArgs e)
        {
            State["ScrollOffsetKey"] = scrollViewerHome.VerticalOffset;
        }

protected override void OnNavigatedTo(NavigationEventArgs e)
        {

if (State.ContainsKey("ScrollOffsetKey"))
            {
                scrollOffset = (double)State["ScrollOffsetKey"];
            }
        }