Live tiles do not collect image from isolated storage

Question

In my WP7 application, I create an image for a live tile and save it in isolated storage. Then an updated live tile is available for my periodic task, and in this regard everything works fine for the periodic task.

I have a problem in my foreground WP7 application when I create a real-time image. I am also updating live tiles (since I know something has changed, so why wait for a periodic task). But when a real-time update occurs here, it seems that he cannot find the newly created file and therefore is a live tile without a bitmap.

In terms of the corresponding code

File creation

var source = new BitmapImage(new Uri("Images/Tiles/Class Timetable with T.png", UriKind.Relative)); source.CreateOptions = BitmapCreateOptions.None; source.ImageOpened += (sender, e) => // This is important. The image can't be rendered before it loaded. { // Create our image as a control, so it can be rendered to the WriteableBitmap. var newImage = new Image(); newImage.Source = source; newImage.Width = 173; newImage.Height = 173; // Define the filename for our tile. Take note that a tile image *must* be saved in /Shared/ShellContent // or otherwise it won't display. var tileImage = string.Format("/Shared/ShellContent/{0}.jpg", Event.UniqueId); // Define the path to the isolatedstorage, so we can load our generated tile from there. var isoStoreTileImage = string.Format("isostore:{0}", tileImage); 

and actual conservation

 // Create a stream to store our file in. var stream = store.CreateFile(tileImage); // Invalidate the bitmap to make it actually render. bitmap.Invalidate(); // Save it to our stream. bitmap.SaveJpeg(stream, 173, 173, 0, 100); // Close the stream, and by that saving the file to the ISF. stream.Close(); 

and code that actually extracts the image and updates the live fragment (and works in a periodic task, but not from the application itself

 string imageString = "isostore:/Shared/ShellContent/" + nextEvent.UniqueId + ".jpg"; ShellTile defaultTile2 = ShellTile.ActiveTiles.First(); defaultTile2.Update(new StandardTileData { Title = nextTime, BackgroundImage = (new Uri(imageString, UriKind.Absolute)), }); 

Just unsure if I am doing something fundamentally wrong here? I am considering storing the generated image in a database with its object. And here I have a manageable number of files. I do not generate hundreds of things.

I have a workaround which is to update the livetile from a WP7 application without using an image file.

Answer 1

Hey, this code looks familiar ;-) Aside, nothing in the code you posted can actually identify the problem.

I assume that you are calling NotifyComplete() at an early stage in your periodic task. For this, I recommend that you use a parallel task library to solve this problem.

I actually wrote an article about this this morning: How: Live tile with a planned agent

The essential part is to let Task.ContinueWith make sure that NotifyComplete() first called after you have finished rendering the background image and saved it to the isolated storage.

Answer 2

When creating in the main application, you do not need the isostore: prefix isostore: on the way. Try just creating a relative URI for the file.