Short Notes on Background Task in Windows Universal Apps

Hello All,

Sharing some notes on Background task.

• Background task allow us to run our code when our app is not in foreground.

               

• Starting with Windows 10, you no longer need to place an app on the lock screen in order to register background tasks.
• Background tasks are limited to 30 seconds of wall-clock usage.
• Respect Cost : Add BackgroundWorkCostValue in run() to get access on priority from system.

            

• Querying cost can prevent cancellations and incomplete operations.
• Handle System Cancellations: 

       

• Use defferal for any asynchronous operations.
• App can have more than one Background Task.
• If get the permission then build and register task(add triggers, add system conditions, task.register())

            

• Some of the Triggers :  DeviceWatcherTrigger , ActivitySensorTrigger , SensorDataThresholdTrigger, ToastNotificationHistoryChangedTrigger, ToastNotificationActionTrigger,AppointmentStoreNotificationTrigger, ContactStoreNotificationTrigger, EmailStoreNotificationTrigger, BluetoothLEAdvertisementWatcherTrigger, BluetoothLEAdvertisementPublisherTrigger, MediaProcessingTrigger,SocketActivityTrigger
• User Invoked Constraints: Quite Hours(No toast, No Background task,Active task are cancelled). Still Allowed VOIP toast and Alarm toast.
• Debugging : Visual studio can trigger,Application logs = Appication & Services Logs ->Microsoft -> BackgroundTaskInfrastructure