Background task TimeTrigger

Question

I am trying to use the TimeTrigger and set up my trigger to fire every minute:

TimeTrigger trigger = new TimeTrigger(1,false);

BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
taskBuilder.TaskEntryPoint = "ShowImagesTask.ShowImageOnTile";
taskBuilder.SetTrigger(trigger);
taskBuilder.Name = "ImageViewonTile";
IBackgroundTaskRegistration taskRegistration = taskBuilder.Register();

Then I get the following exception on the call to Register:

exception of type "System.ArgumentException occured

Additional information: Value did not fall in expected range

 

I  What is the expected range as 1 minute seems reasonable

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john mcfetridge

Answer 1

TimeTrigger resolution is 15 minutes.  See  http://msdn.microsoft.com/en-us/library/windows/apps/windows.applicationmodel.background.timetrigger.timetrigger(v=VS.85).aspx

Answer 2

ouch! So I guess this is not the mechanism to use when I want to update tiles on a much more timely basis like 1 minute

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john mcfetridge

Answer 3

Updating every minute is much faster than is suggested.  What is the usage scenario that requires that?

Please see  the appropriate uses of tile notifications section at http://msdn.microsoft.com/en-us/library/windows/apps/hh465391%28v=vs.85%29.aspx#appropriate_use_of_tile_notifications which suggests that a busy app might notify every 15 minutes.

--Rob

Answer 4

I have a web traffic app that I am porting from WP7 and I would like to display a sequence of favorite cameras in the tile. Now 1-2 minute trigger would be the least to make this usable so they have some idea of the traffic. The background task would allow the updating to occur wihile the app was suspended which would be quite useful I believe.

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john mcfetridge

Answer 5

Hey,

I want to update the tile(that means changing the text on the tile) using a background task and tile notifications. Can you please help me how to relate the background task and tile notifications to achieve the update tile text.