![]() ![]() ![]() Trigger the background task by calling ApplicationTrigger.RequestAsync. A good time to verify that all of your background tasks are registered is during app launch. Trigger the background taskīefore you trigger the background task, use BackgroundTaskRegistration to verify that the background task is registered. Ensure that your app gracefully handles scenarios where background task registration fails - if instead your app depends on having a valid registration object after attempting to register a task, it may crash. An error is returned if any of the registration parameters are invalid. String ^ taskName = "Example application trigger" īackgroundTaskRegistration ^ task = RegisterBackgroundTask(entryPoint, taskName, appTrigger, internetCondition) īackground task registration parameters are validated at the time of registration. String ^ entryPoint = "Tasks.ExampleBackgroundTaskClass" Windows::ApplicationModel::Background::SystemCondition internetCondition SystemCondition internetCondition = new SystemCondition(SystemConditionType.InternetAvailable) For a list of possible conditions, see SystemConditionType. In this example the condition is set to InternetAvailable so that, once triggered, the task only runs once internet access is available. For more information, see Set conditions for running a background task. A condition prevents the background task from running until the condition is met. You can create a background task condition to control when the task runs. Windows::ApplicationModel::Background::ApplicationTrigger _AppTrigger ĪpplicationTrigger ^ _AppTrigger = ref new ApplicationTrigger() _AppTrigger is an ApplicationTrigger field defined at a scope that will keep it alive Or, you could create a new ApplicationTrigger instance and use that when you want to as long as you need to trigger the background task. But you can use any ApplicationTrigger instance to signal the trigger. This is for convenience so that we don't have to create a new instance later when we want to signal the trigger. You could store it in a field as is done in the snippet below. Create an application triggerĬreate a new ApplicationTrigger. If background work should halt when the app is closed, or should be tied to the state of the foreground process, then Extended Execution should be used, instead. An ApplicationTrigger is appropriate if your app has work that needs to be done in the background-even if the user closes the foreground app. Use an ApplicationTrigger to run code in a separate process from the foreground app. ![]() Or, follow the steps in Create and register an out-of-process background task to create one. If you don't already have a background task, there is a sample background task at BackgroundActivity.cs. This topic assumes that you have a background task that you want to activate from your application. Learn how to use the ApplicationTrigger to activate a background task from within your app.įor an example of how to create an Application trigger, see this example. ![]()
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