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POUpdate live tile when exiting app - any restrictions/best practices
 

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    <p>I have an app where I would like to update the live tile when the user leaves the app. First question is if this is a bad idea? If the user starts the app 20 times per day will this be a bad idea or in any way affect the background service?</p> <p>Second question is if there is a limit for how long or resource intensive this might be. I guess I will put this code in OnNavigatedFrom, will the OS kill the app if the updating of live tile takes too long? I need to create an image, save it to isolated storage, read the image and then update the tile.</p> <p>Really looking forward to some thoughts from you on this.</p> <p>EDIT 1: The reason for me asking is that if I do it like above it works just fine. But if I exit the app immediately when it starts up I only get a black tile instead of a tile with a background image. So I get the impression that the code doesn't finish. How can I avoid that?</p> <p>EDIT 2: Since I'm creating my live tile dynamically I think the problem is the loading of the background image. I load a background image and then add text to it. When the tile goes black I can still see the text so there must be something with the loading of the background image that is used as background for the tile.</p> <p>Edit 3:Here is the complete code for the creation of the image that is used as a background image. I tried to simplify it a little to reduce the code.</p> <pre><code>Grid grid = new Grid(); StackPanel sp = new StackPanel(); sp.Height = 173; sp.Width = 173; sp.Background = (SolidColorBrush)Application.Current.Resources["PhoneAccentBrush"]; strBackBackground = ""; StreamResourceInfo info; sp.Background = (SolidColorBrush)Application.Current.Resources["PhoneAccentBrush"]; strBackBackground = ""; info = Application.GetResourceStream(new Uri("/MyApp;component/images/Icons/livetile/metro-" + strSymbol + ".png", UriKind.Relative)); // create source bitmap for Image control (image is assumed to be alread 173x173) WriteableBitmap wbmp3 = new WriteableBitmap(1, 1); try { wbmp3.SetSource(info.Stream); } catch { } Image img3 = new Image(); img3.Source = wbmp3; // add Image to Grid img3.Width = 173; img3.Height = 173; img3.Margin = new Thickness { Left = 0, Bottom = 0, Right = 0, Top = 0 }; TextBlock txtTemperature = new TextBlock(); TextBlock txtTemperatureRing = new TextBlock(); txtTemperature.Foreground = new SolidColorBrush(Colors.White); txtTemperature.Text = strTemp; txtTemperature.TextAlignment = TextAlignment.Right; txtTemperatureRing.Style = (Style)Application.Current.Resources["PhoneTextTitle3Style"]; txtTemperatureRing.FontFamily = new FontFamily("Segoe WP Light"); txtTemperatureRing.FontSize = 40; txtTemperatureRing.Foreground = new SolidColorBrush(Colors.White); txtTemperatureRing.Text = "°"; txtTemperatureRing.TextAlignment = TextAlignment.Right; txtTemperature.FontFamily = new FontFamily("Segoe WP"); txtTemperature.FontSize = 40; txtTemperature.Margin = new Thickness { Left = 0, Bottom = 0, Right = 0, Top = -55 }; txtTemperature.Height = 80; txtTemperature.Width = 135; txtTemperatureRing.Margin = new Thickness { Left = 130, Bottom = 0, Right = 0, Top = -112 }; txtTemperatureRing.Height = 50; txtTemperatureRing.Width = 29; sp.Children.Add(img3); sp.Children.Add(txtTemperature); sp.Children.Add(txtTemperatureRing); //call measure, arrange and updatelayout to prepare for rendering sp.Measure(new Size(173, 173)); sp.Arrange(new Rect(0, 0, 173, 173)); sp.UpdateLayout(); grid.Children.Add(sp); WriteableBitmap wbmp = new WriteableBitmap(173, 173); wbmp.Render(grid, null); wbmp.Invalidate(); //write image to isolated storage string sIsoStorePath = @"\Shared\ShellContent\tile.png"; using (IsolatedStorageFile appStorage = IsolatedStorageFile.GetUserStoreForApplication()) { //ensure directory exists String sDirectory = System.IO.Path.GetDirectoryName(sIsoStorePath); if (!appStorage.DirectoryExists(sDirectory)) { appStorage.CreateDirectory(sDirectory); } using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream(sIsoStorePath, System.IO.FileMode.Create, appStorage)) { wbmp.SaveJpeg(stream, 173, 173, 0, 100); } } /// If application uses both PeriodicTask and ResourceIntensiveTask if (task is PeriodicTask) { ShellTile TileToFind = ShellTile.ActiveTiles.First(); if (TileToFind != null) { StandardTileData NewTileData = new StandardTileData { BackgroundImage = new Uri("isostore:Shared/ShellContent/tile.png", UriKind.Absolute), Title = strTitle, Count = null, BackTitle = (string)settings["SelectedCityName"], BackBackgroundImage = new Uri(strBackBackground, UriKind.Relative), BackContent = strWind + Environment.NewLine + strPrecipitation }; TileToFind.Update(NewTileData); } } </code></pre>
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