In windows 8 metro style app, how to update live tile while app is not running ?
And the live tile start to run when OS system begin to start.
"3.Use polling notifications from the cloud to update the tile while the app is not running"
But I cannot find any example code.
I also try MSDN's PushNotificationSample, But I don't know how to set the "Server URI"?
Does anyone have similar experiences?
Okay, let's get you answered! Here is every single way and resources for each way to get you started. Your scenario isn't clear to me, so I will try to be generic.
There are four ways to update a live tile in Windows 8! And this is true for the primary app tile and the subsequent secondary tiles created by the app, too.
1> The first is that the app, while running, can update the tile
But, you were asking how to update when it is not running:
2> A user can deploy a background task with their Windows 8 app. This background task executes periodically and can update the tile of the app during its execution. The minimum frequency of background tasks is 15 minutes. Windows 8 allocates 1 CPU second every two hours to a task. Your task can execute as often as you want until you exhaust its allocation.
3> An app can open a WNS (Windows Notification Services) channel while it is running. When it is not running, a web service can push tile updates across WNS.
- http://msdn.microsoft.com/en-us/library/windows/apps/hh465460.aspx
- http://visualstudiomagazine.com/articles/2012/03/25/using-push-notifications-in-windows-8.aspx
- http://msdn.microsoft.com/en-us/library/windows/apps/xaml/Hh868253(v=win.10).aspx
4> A tile can be configured to pull from a URL. The XML from that URL is periodically evaluated for deltas and the tile is refreshed when detected. Tiles expire by default after three days.
- http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.notifications.tileupdater.startperiodicupdate.aspx
- http://msdn.microsoft.com/en-us/library/windows/apps/hh761476.aspx
Point of clarification: you can't cause something like a tile update when the OS is booted. For one, in Windows 8 the idea of rebooting (or at least shutting down) is practically deprecated. But your Store app can only execute in the ways above - and can't do something like the StartUp folder (in the past) or RegEdit/Run (in the past) just the stuff above. But maintenance or timer triggers get you pretty close.
And, that's the answer. Best of luck, dude!
Try background tasks @ http://code.msdn.microsoft.com/windowsapps/Background-Task-Sample-9209ade9
来源：https://stackoverflow.com/questions/11607778/in-windows-8-metro-style-app-how-to-update-live-tile-while-app-is-not-running