Приостановлено выполнение фоновой задачи триггера таймера UWP - PullRequest
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Приостановлено выполнение фоновой задачи триггера таймера UWP

0 голосов
/ 25 мая 2020

Я работаю над BackgroundTask на UWP и пытаюсь запустить эту задачу, но по какой-то неизвестной причине она всегда заканчивается отображением приостановки в диспетчере задач и не запускается. Ниже приведен код

Вот как я регистрирую свою BackgroundTask 

    public static async Task InitializeLatestNewsTaskAsync()
    {
        TimeTrigger hourlyTrigger = new TimeTrigger(15, false);

        BackgroundExecutionManager.RemoveAccess();
        var requestStatus = await BackgroundExecutionManager
            .RequestAccessKindAsync(BackgroundAccessRequestKind.AlwaysAllowed, "Please allow the app to run in background");

        if (!requestStatus)
        {
            Util.MessageBox("Warrning", "You will not receive any Announcements notifications");
        }
        else
        {
            try 
            {
                BackgroundTaskRegistration backgroundTaskRegistration = RegisterBackgroundTask(Constants.BACKGROUND_TASK_LATEST_NEWS_ENTRY_POINT,
                    Constants.BACKGROUND_TASK_LATEST_NEWS_NAME, hourlyTrigger, null);
            } 
            catch (Exception e)
            {
                log.Error(e.Message, e);
            }
        }
    }

    //
    // Register a background task with the specified taskEntryPoint, name, trigger,
    // and condition (optional).
    //
    // taskEntryPoint: Task entry point for the background task.
    // taskName: A name for the background task.
    // trigger: The trigger for the background task.
    // condition: Optional parameter. A conditional event that must be true for the task to fire.
    //
    private static BackgroundTaskRegistration RegisterBackgroundTask(
        string taskEntryPoint, string taskName, IBackgroundTrigger trigger, IBackgroundCondition condition)
    {
        //
        // Check for existing registrations of this background task.
        //

        foreach (var cur in BackgroundTaskRegistration.AllTasks)
        {
            if (cur.Value.Name == taskName)
            {
                //
                // The task is already registered.
                //
                BackgroundTaskRegistration backgroundTaskRegistration = (BackgroundTaskRegistration)(cur.Value);
                backgroundTaskRegistration.Unregister(true);
                break;
            }
        }

        //
        // Register the background task.
        //

        var builder = new BackgroundTaskBuilder();

        builder.Name = taskName;
        builder.TaskEntryPoint = taskEntryPoint;
        builder.SetTrigger(trigger);
        builder.IsNetworkRequested = true;

        if (condition != null)
        {
            builder.AddCondition(condition);
        }

        BackgroundTaskRegistration task = builder.Register();
        task.Completed += new BackgroundTaskCompletedEventHandler(OnCompleted);


        return task;
    }

    private static async void OnCompleted(IBackgroundTaskRegistration task, BackgroundTaskCompletedEventArgs args)
    {
        log.Info("Completed");
    }

И вот мои объявления Package.appxmanifest

enter image description here

и реализация My BackgroundTask 

public sealed class LatestNewsBackgroundTask : IBackgroundTask
{
    private ILogger log = LogManagerFactory.DefaultLogManager.GetLogger<LatestNewsBackgroundTask>();

    BackgroundTaskDeferral _deferral;
    public void Run(IBackgroundTaskInstance taskInstance)
    {
        log.Info("Latest New Background Task Started");

        _deferral = taskInstance.GetDeferral();
        taskInstance.Canceled += new BackgroundTaskCanceledEventHandler(OnCanceled);

        var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
        var announcementTypes = localSettings.Values["announcementTypes"];

        NotificationHelper.GenerateToast("working from background task ", announcementTypes.ToString());

        log.Info("Latest New Background Task Completed");

        _deferral.Complete();
    }

    private void OnCanceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason)
    {
        // Indicate that the background task is canceled.

        log.Info("Background " + sender.Task.Name + " Cancel Requested...");
    }
}

Все, что я пытался отладить

https://docs.microsoft.com/en-us/windows/uwp/launch-resume/debug-a-background-task

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