public GeolocationPage()
{
InitializeComponent();
NavigationCacheMode = NavigationCacheMode.Required;
_navigationHelper = new NavigationHelper(this);
_navigationHelper.LoadState += NavigationHelper_LoadState;
_navigationHelper.SaveState += NavigationHelper_SaveState;
}
public MainPage()
{
InitializeComponent();
NavigationCacheMode = NavigationCacheMode.Required;
navigationHelper = new NavigationHelper(this);
navigationHelper.LoadState += NavigationHelper_LoadState;
navigationHelper.SaveState += NavigationHelper_SaveState;
var viewmodel = DataContext as MainViewModel;
if (viewmodel != null)
viewmodel.CollectionLoaded += OnCollectionLoaded;
}