c# windows 10 raw notification when app is CLOSED

Question

I am developing a Windows 10 UWP application and I have a problem with raw notification sending and handling.

I am sending the notification from a server written in php, and when app is open I can receive the sent raw notification. Below is the template of my notification:

           <toast launch='args'>
                <visual>
                    <binding template = 'ToastGeneric'>
                         <text> başlık </text>
                         <text> Açıklama </text>
                        </binding>
                    </visual>
            </toast>

I sent the template above as a raw notification.

Also, I am using the method below as backgroundtask

public void Run(IBackgroundTaskInstance taskInstance)
    {
        // Get the background task details
        ApplicationDataContainer settings = ApplicationData.Current.LocalSettings;
        string taskName = taskInstance.Task.Name;

        Debug.WriteLine("Background " + taskName + " starting...");

        // Store the content received from the notification so it can be retrieved from the UI.
        RawNotification notification = (RawNotification)taskInstance.TriggerDetails;
        settings.Values[taskName] = notification.Content;
        Windows.Data.Xml.Dom.XmlDocument doc = new XmlDocument();

        var toast = new ToastNotification(doc);
        var center = ToastNotificationManager.CreateToastNotifier();
        center.Show(toast);


        Debug.WriteLine("Background " + taskName + " completed!");
    }

I set the task entry point in appmanifest, I could not test it with debugger.

I register the background task with the code below:

 private void RegisterBackgroundTask()
    {
        BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
        PushNotificationTrigger trigger = new PushNotificationTrigger();
        taskBuilder.SetTrigger(trigger);

        // Background tasks must live in separate DLL, and be included in the package manifest
        // Also, make sure that your main application project includes a reference to this DLL
        taskBuilder.TaskEntryPoint = SAMPLE_TASK_ENTRY_POINT;
        taskBuilder.Name = SAMPLE_TASK_NAME;

        try
        {
            BackgroundTaskRegistration task = taskBuilder.Register();
            task.Completed += BackgroundTaskCompleted;
        }
        catch (Exception ex)
        {
            // rootPage.NotifyUser("Registration error: " + ex.Message, NotifyType.ErrorMessage);
            UnregisterBackgroundTask();
        }
    }

Finally, my pushreceived event:

private async void OnPushNotificationReceived(PushNotificationChannel sender, PushNotificationReceivedEventArgs e)
    {
        if (e.NotificationType == PushNotificationType.Raw)
        {
            e.Cancel = false;

            Windows.Data.Xml.Dom.XmlDocument doc = new Windows.Data.Xml.Dom.XmlDocument();

            var t = @" <toast launch='args'>
                <visual>
                    <binding template = 'ToastGeneric'>
                         <text> başlık </text>
                         <text> Açıklama </text>
                        </binding>
                    </visual>
            </toast> ";

            doc.LoadXml(t);

            var toast = new ToastNotification(doc);
            var center = ToastNotificationManager.CreateToastNotifier();
            center.Show(toast);
        }
    }

the inside of the method is only for testing.

Now, I want to ask that what is wrong or missin in my structure? Any suggession, example or help is appreciated.

Thanks in advance.

score 1 · Answer 1 · answered Jan 27 '16 at 22:16

1

Did you check in manifest Declarations that you have checked "Push notifications"?

Also you need at top the RegisterBackgroundTask method call

await BackgroundExecutionManager.RequestAccessAsync();

Here is documentation https://msdn.microsoft.com/pl-pl/library/hh700494.aspx where is important sentence "Requests that the app be permitted to run background tasks."

At the end check entry point and name of your background task

answered Jan 27 '16 at 22:16

matihuf

352
1
11

Hi @matihuf I'm trying to develop a test UWP and receive Background Raw Notifications even when is closed, this is our first App and we need a very basic example to achieve this. By now we have an Azure Account and the WNS is set, also have a project inside my solution which name is backgroundtask.cs and the objetive is to receive the notification and can't find a basic startup for this, can you help us with this? Thanks – yehanny Sep 28 '17 at 23:11
I don't have any sample code right now, but please read this https://learn.microsoft.com/en-us/windows/uwp/controls-and-patterns/tiles-and-notifications-raw-notification-overview you are interested in the section "Background tasks triggered by raw notifications" – matihuf Sep 30 '17 at 17:23
Thanks for the help buddy I'll take a look and reply back the results... :) – yehanny Oct 02 '17 at 14:52

c# windows 10 raw notification when app is CLOSED

1 Answers1