private void NaviViewMain_SelectionChanged(NavigationView sender, NavigationViewSelectionChangedEventArgs args)
{
if (FirstClick)
{
FirstClick = false;
FrameMain.Navigate(typeof(PageZajiao));
FrameMain.Navigate(typeof(PageParent));
if (NaviViewItemZajiao == sender.SelectedItem)
{
FrameMain.GoBack();
}
}
else
{
if (sender.SelectedItem == CurrentItem)
{
return;
}
if (NaviViewItemZajiao == sender.SelectedItem)
{
FrameMain.GoBack();
}
if (NaviViewItemParent == sender.SelectedItem)
{
FrameMain.GoForward();
}
}
CurrentItem = (NavigationViewItem)sender.SelectedItem;
}