/// <summary>
/// Invoked when application execution is being suspended. Application state is saved
/// without knowing whether the application will be terminated or resumed with the contents
/// of memory still intact.
/// </summary>
/// <param name="sender">The source of the suspend request.</param>
/// <param name="e">Details about the suspend request.</param>
private void OnSuspending(object sender, SuspendingEventArgs e)
{
// Track App suspension/exit:
GlobalStopwatch.Stop();
TelemetryHelper.TrackMetric("AppRuntime", GlobalStopwatch.Elapsed.TotalMilliseconds);
var metrics = new Dictionary <string, string> {
{ "appRuntime", GlobalStopwatch.Elapsed.TotalMilliseconds.ToString() }
};
TelemetryHelper.TrackEvent("UserRuntime", metrics);
var deferral = e.SuspendingOperation.GetDeferral();
//TODO: Save application state and stop any background activity
deferral.Complete();
}
/// <summary>
/// Invoked when the heartbeat timer ticks.
/// </summary>
void HeartbeatTimer_Tick(object sender, object e)
{
// Log telemetry event that the device is alive
TelemetryHelper.TrackMetric("DeviceHeartbeat", heartbeatInterval);
}