如何以编程方式删除在锁定屏幕中启动的UWP吐司通知？

Question

I'm launching a toast notification either from the background or in the foreground. When the notification was launched while the app is in the foreground, I can hide the notification using:

_ToastNotifier.Hide(notification);

But when the notification was launched from the background, it doesn't hide the notification from the screen and it keeps ringing the alert. I wish I can hide the notification when app is activated.

Also, removing using ToastNotificationManager.History.Remove(tag); didn't work for me.

To see it fail, do the following:

1. Run the app.

2. Make the tablet sleep(start menu>power>sleep or use the sleep button in the tablet).

3. Wake the tablet.

4. While in the lock screen, send a notification from a different device/server to the app.

5. You will hear the notification sound.

6. Open the app from the taskbar, don't activate the notification. This is the part where I want to hide the notification, the app is opened and I don't need the notification in the lower right side of the screen. The notification will not go away until you tap on it, which is very inconvenient.

Update: It doesn't matter if it's in the background or foreground. As long as the notification was received while in lock screen". Please see the steps.

Note that this Toast notofication has a looping audio and scenario="incomingCall".

Answer 1

If you want to remove the notification, simply call

ToastNotificationManager.History.Remove("tagOfNotification");

You'll have to specify a Tag (and optionally a Group ) on your notification so that you can identify it and remove it.

var toast = new ToastNotification(xml);
toast.Tag = "tag1";

// Send the toast