(true) // passing true to cancel currently running instances of this background task Unregister tasks that are part of a groupįoreach (var groupKeyValue in BackgroundTaskRegistration.AllTaskGroups)įoreach (var groupedTask in ) The following shows how to unregister background tasks that were registered as part of a group.īecause background tasks registered in a group don't appear in BackgroundTaskRegistration.AllTasks, you must iterate through the groups, find the background tasks registered to each group, and unregister them. Because builder.TaskEntryPoint is not specified, OnBackgroundActivated() will be raised when the background task is triggeredīackgroundTaskRegistration task = builder.Register() Var builder = new BackgroundTaskBuilder() īuilder.TaskGroup = group // we specify the group, hereīuilder.SetTrigger(new SystemTrigger(SystemTriggerType.TimeZoneChange, false)) Group = new BackgroundTaskRegistrationGroup(groupId, groupFriendlyName) If the background task is not in a group, register it See if this task already belongs to a groupįoreach (var taskKeyValue in group.AllTasks) Public static void RegisterBackgroundTaskInGroup()īackgroundTaskRegistrationGroup group = BackgroundTaskRegistration.GetTaskGroup(groupId) Private const string myTaskName = "My Background Trigger" private const string groupFriendlyName = "myGroup" The following shows how to register a background task (triggered by a time zone change, in this example) as part of a group. Registering In-Process background tasks with a group will cause the activation to go through BackgroundTaskRegistrationGroup.BackgroundActivated event instead of Application.OnBackgroundActivated.Each Background Task Registration will have a Group property to determine which group it is associated with.See Unregister background tasks in a group below to see how to unregister all background triggers that have been registered as part of a group. Thus apps that currently use BackgroundTaskRegistration.AllTasks to unregister their tasks won't inadvertently unregister background tasks registered in a group. Background tasks registered in a group won't appear in BackgroundTaskRegistration.AllTasks.Multiple background tasks can be registered in a group.They can also have an associated friendly name string which is easier to read while debugging. Groups can be uniquely identified by a GUID.With groups, you can isolate your background task registrations so this doesn't happen. App authors could also accidently remove framework and library background task registrations because they could unregister all registered background tasks by using BackgroundTaskRegistration.AllTasks. When an app and the framework (or library) it uses registers a background task with the same name, the app could inadvertently remove the framework's background task registrations. This isolation helps ensure that different components of an app, or different libraries, don’t interfere with each other’s background task registration. Background tasks can now be registered in a group, which you can think of as a logical namespace.
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