Windows 10 IOT Lifecycle (or: how to property terminate a background application)

Question

In order to use a UWP application on a headless Raspberry Pi 2 with Windows 10 IOT Core we can use the background application template which basically creates a new UWP app with

Answer 1

You need to handle the canceled event. The background task will be canceled if the device is shutdown properly. Windows will also cancel tasks if they unregistered.

    BackgroundTaskDeferral _defferal;
    public void Run(IBackgroundTaskInstance taskInstance)
    {
         _defferal = taskInstance.GetDeferral();
        taskInstance.Canceled += TaskInstance_Canceled;
    }

    private void TaskInstance_Canceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason)
    {
        //a few reasons that you may be interested in.
        switch (reason)
        {
            case BackgroundTaskCancellationReason.Abort:
                //app unregistered background task (amoung other reasons).
                break;
            case BackgroundTaskCancellationReason.Terminating:
                //system shutdown
                break;
            case BackgroundTaskCancellationReason.ConditionLoss:
                break;
            case BackgroundTaskCancellationReason.SystemPolicy:
                break;
        }
        _defferal.Complete();
    }

Cancellation Reasons

Canceled Event