protected override void OnNavigatedFrom(NavigationEventArgs e)
{
if (_visitMonitor != null)
{
_visitMonitor.Stop();
_visitMonitor.VisitStateChanged -= OnVisitStateChanged;
}
}
/// <summary>
/// This is the click handler for the 'StopMonitoring' button.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void StopMonitoring(object sender, RoutedEventArgs e)
{
// Stop visit monitoring.
_visitMonitor.Stop();
_visitMonitor = null;
StartMonitoringButton.IsEnabled = true;
StopMonitoringButton.IsEnabled = false;
// Clear status
_rootPage.NotifyUser("", NotifyType.StatusMessage);
}
/// <summary>
/// Invoked immediately before the Page is unloaded and is no longer the current source of a parent Frame.
/// </summary>
/// <param name="e">
/// Event data that can be examined by overriding code. The event data is representative
/// of the navigation that will unload the current Page unless canceled. The
/// navigation can potentially be canceled by setting e.Cancel to true.
/// </param>
protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
_visitMonitor?.Stop();
}