I am working on an app for Windows Phone 8 that uses some custom navigation. I made a class that inherits from UriMapperBase and set it into the RootFrame during application startup. In this mapper I can handle custom Protocols and redirect them to pages in my application.
I also use this mechanism to forward the user to a page to ask them to allow or deny the app rights to use the location services the first time its loaded up. This resulted in a strange case where I was actually redirecting the user to a page other than what they were actually navigating to. When I then attempted to navigate them to the correct page it ended up being a no-op since the current page was at the top of the navigation stack as the uri I was attempting to navigate to. In other platforms the NavigationService has a Refresh method you can call to resolve such problems but in Windows Phone 8 it is mysteriously missing. So after wasting a couple hours I managed to find a way to resolve this cunundrum.
Simply create a page in your application called Refresh.xaml and Navigate to this page. Something like this:
private void OnAllowClick(object sender, RoutedEventArgs e)
{
LocationService.AllowLocationServices = true;
this.NavigationService.Navigate(new Uri("/Views/Refresh.xaml", UriKind.Relative));
}
Then in Refresh.xaml you simply pop the last item off the navigation stack and navigate back to it:
public partial class Refresh : PhoneApplicationPage
{
public Refresh()
{
InitializeComponent();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
var j = this.NavigationService.RemoveBackEntry();
this.Dispatcher.BeginInvoke(() => App.RootFrame.Navigate(j.Source));
base.OnNavigatedTo(e);
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
this.NavigationService.RemoveBackEntry();
base.OnNavigatedTo(e);
}
}
This will refresh to the current uri and preserve the navigation stack correctly.
