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POWhy is my Windows Store app not showing anything in the print preview?
 

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  1. POWhy is my Windows Store app not showing anything in the print preview?
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    <p>I was using the <a href="http://code.msdn.microsoft.com/windowsapps/Print-Sample-c544cce6" rel="nofollow">PrintSample</a> and successfully modified the BasePrintPage code to the following (just trying to cut it down to a manageable size and the simplest case for testing):</p> <pre><code> protected PrintDocument printDocument = null; protected IPrintDocumentSource printDocumentSource = null; internal List&lt;UIElement&gt; printPreviewElements = new List&lt;UIElement&gt;(); protected event EventHandler pagesCreated; protected void PrintTaskRequested(PrintManager sender, PrintTaskRequestedEventArgs e) { PrintTask printTask = null; printTask = e.Request.CreatePrintTask("C# Printing SDK Sample", sourceRequested =&gt; { printTask.Completed += async (s, args) =&gt; { if (args.Completion == PrintTaskCompletion.Failed) { await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async () =&gt; { MessageDialog dialog = new MessageDialog("Something went wrong while trying to print. Please try again."); await dialog.ShowAsync(); }); } }; sourceRequested.SetSource(printDocumentSource); }); } protected void RegisterForPrinting() { printDocument = new PrintDocument(); printDocumentSource = printDocument.DocumentSource; printDocument.Paginate += CreatePrintPreviewPages; printDocument.GetPreviewPage += GetPrintPreviewPage; printDocument.AddPages += AddPrintPages; PrintManager printMan = PrintManager.GetForCurrentView(); printMan.PrintTaskRequested += PrintTaskRequested; } protected void UnregisterForPrinting() { if (printDocument != null) { printDocument.Paginate -= CreatePrintPreviewPages; printDocument.GetPreviewPage -= GetPrintPreviewPage; printDocument.AddPages -= AddPrintPages; PrintManager printMan = PrintManager.GetForCurrentView(); printMan.PrintTaskRequested -= PrintTaskRequested; } } protected void CreatePrintPreviewPages(object sender, PaginateEventArgs e) { printPreviewElements.Clear(); PrintTaskOptions printingOptions = ((PrintTaskOptions)e.PrintTaskOptions); PrintPageDescription pageDescription = printingOptions.GetPageDescription(0); AddOnePrintPreviewPage(pageDescription); if (pagesCreated != null) { pagesCreated.Invoke(printPreviewElements, null); } ((PrintDocument)sender).SetPreviewPageCount(printPreviewElements.Count, PreviewPageCountType.Intermediate); } protected void GetPrintPreviewPage(object sender, GetPreviewPageEventArgs e) { ((PrintDocument)sender).SetPreviewPage(e.PageNumber, printPreviewElements[e.PageNumber - 1]); } protected void AddPrintPages(object sender, AddPagesEventArgs e) { foreach (UIElement element in printPreviewElements) { printDocument.AddPage(element); } ((PrintDocument)sender).AddPagesComplete(); } protected void AddOnePrintPreviewPage(PrintPageDescription printPageDescription) { TextBlock block = new TextBlock(); block.Text = "This is an example."; block.Width = printPageDescription.PageSize.Width; block.Height = printPageDescription.PageSize.Height; printPreviewElements.Add(block); } protected override void OnNavigatedTo(NavigationEventArgs e) { RegisterForPrinting(); } protected override void OnNavigatedFrom(NavigationEventArgs e) { UnregisterForPrinting(); } </code></pre> <p>This works fine and dandy in the PrintSample, displaying a print preview page with the TextBox's text, "This is an example." But, when I throw this code into my own app, trying to invoke printing from a button displays a blank page. So what am I missing here? What is the PrintSample doing that I forgot to do?</p>
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