}//RequestBackgroundAccess end
/// <summary>
/// Finds a previously registered background task for this scenario and cancels it (if present)
/// </summary>
private void FindAndCancelExistingBackgroundTask()
{
foreach (var backgroundTask in BackgroundTaskRegistration.AllTasks.Values)
{
if (SaferConfiguration.GetTaskName() == backgroundTask.Name)
{
((BackgroundTaskRegistration)backgroundTask).Unregister(true);
break;
}
}
}
public bool RegisterBackgroundTask()
{
FindAndCancelExistingBackgroundTask();
BackgroundTaskBuilder accelerometerTaskBuilder = new BackgroundTaskBuilder()
{
Name = SaferConfiguration.GetTaskName(),
TaskEntryPoint = SaferConfiguration.GetTaskEntryPoint(),
};
//Trigger set
accelerometerTaskBuilder.SetTrigger(manualTrigger);
//Task registered
saferAccelerometerRegistrationManual = accelerometerTaskBuilder.Register();
//background task completion event handler
saferAccelerometerRegistrationManual.Completed += new BackgroundTaskCompletedEventHandler(OnBackgroundTaskCompleted);
return(Registered = true);
}
private async void GRegister_Click(object sender, RoutedEventArgs e)
{
// Get permission for a background task from the user. If the user has already answered once,
//this does nothing and the user must manually update their preference via PC Settings.
BackgroundAccessStatus backgroundAccessStatus = await BackgroundExecutionManager.RequestAccessAsync();
// Regardless of the answer, register the background task. If the user later adds this application
// to the lock screen, the background task will be ready to run.
// Create a new background task builder
BackgroundTaskBuilder geofenceTaskBuilder = new BackgroundTaskBuilder();
geofenceTaskBuilder.Name = SaferConfiguration.GetTaskName();
geofenceTaskBuilder.TaskEntryPoint = SaferConfiguration.GetTaskEntryPoint();
// Create a new location trigger
var trigger = new LocationTrigger(LocationTriggerType.Geofence);
// Associate the locationi trigger with the background task builder
geofenceTaskBuilder.SetTrigger(trigger);
// If it is important that there is user presence and/or
// internet connection when OnCompleted is called
// the following could be called before calling Register()
// SystemCondition condition = new SystemCondition(SystemConditionType.UserPresent | SystemConditionType.InternetAvailable);
// geofenceTaskBuilder.AddCondition(condition);
// Register the background task
saferAccelerometerRegistrationGeofence = geofenceTaskBuilder.Register();
// Associate an event handler with the new background task
saferAccelerometerRegistrationGeofence.Completed += new BackgroundTaskCompletedEventHandler(OnBackgroundTaskCompleted);
switch (backgroundAccessStatus)
{
case BackgroundAccessStatus.Unspecified:
case BackgroundAccessStatus.Denied:
Error = "This application must be added to the lock screen before the background task will run.";
break;
}
}