In the previous step, you added a resource file and started adding code to your application. In this step, you'll add the rest of your application code.

1. First, you'll add the event handlers for the Printing_Loaded, Printing_Unloaded, and btnPrint_Click events within and event handler region:

   C#	Copy Code
   #region event handlers void Printing_Unloaded(object sender, RoutedEventArgs e) { UnregisterForPrinting(); } void Printing_Loaded(object sender, RoutedEventArgs e) { // init printing RegisterForPrinting(); } private async void btnPrint_Click(object sender, RoutedEventArgs e) { await Windows.Graphics.Printing.PrintManager.ShowPrintUIAsync(); } #endregion

   
   
2. Create another region for the printing implementation:

   C#	Copy Code
   #region implemention #endregion

   
   
3. Within the implementation region, add the PrintTaskRequested event handler:

   C#

   Copy Code

   /// <summary> /// This is the event handler for PrintManager.PrintTaskRequested. /// </summary> /// <param name="sender">PrintManager</param> /// <param name="e">PrintTaskRequestedEventArgs </param> protected void PrintTaskRequested(PrintManager sender, PrintTaskRequestedEventArgs e) { PrintTask printTask = null; printTask = e.Request.CreatePrintTask("SamplePDF", sourceRequested => { // Print Task event handler is invoked when the print job is completed. printTask.Completed += async (s, args) => { // Notify the user when the print operation fails. if (args.Completion == PrintTaskCompletion.Failed) { await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () => { MessageDialog dialog = new MessageDialog("Failed to print."); dialog.ShowAsync(); }); } };

   
   
4. Directly below the PrintTaskRequested event handler, set some options like the paper size and orientation:

   C#	Copy Code
   // set print options like paper size and orientation Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () => { var layout = rtb.ViewManager.PresenterInfo as C1PageLayout; if (layout != null && layout.Width > layout.Height) { printTask.Options.Orientation = PrintOrientation.Landscape; } }); sourceRequested.SetSource(printDocumentSource); }); }

   
   
5. The method you'll add next registers the app for printing with Windows and sets up the event handlers for the print process:

   C#

   Copy Code

   /// <summary> /// This method registers the app for printing with Windows and sets up the necessary event handlers for the print process. /// </summary> protected void RegisterForPrinting() { // Create the PrintDocument. printDocument = new PrintDocument(); // Save the DocumentSource. printDocumentSource = printDocument.DocumentSource; // Add an event handler which sets up print preview. printDocument.Paginate += Paginate; // Add an event handler which provides a specified preview page. printDocument.GetPreviewPage += GetPrintPreviewPage; // Add an event handler which provides all final print pages. printDocument.AddPages += AddPrintPages; // Create a PrintManager and add a handler for printing initialization. PrintManager printMan = PrintManager.GetForCurrentView(); printMan.PrintTaskRequested += PrintTaskRequested; }

   
   
6. Add the method that un-registers the app for printing:

   C#

   Copy Code

   /// <summary> /// This method unregisters the app for printing with Windows. /// </summary> protected void UnregisterForPrinting() { if (printDocument == null) return; printDocument.Paginate -= Paginate; printDocument.GetPreviewPage -= GetPrintPreviewPage; printDocument.AddPages -= AddPrintPages; // Remove the handler for printing initialization. PrintManager printMan = PrintManager.GetForCurrentView(); printMan.PrintTaskRequested -= PrintTaskRequested; }

   
   
7. The last code you'll add within the implementation region contains three event handlers:

   C#

   Copy Code

   /// <summary> /// This is the event handler for PrintDocument.Paginate. /// It fires when the PrintManager requests print preview /// </summary> /// <param name="sender">PrintDocument</param> /// <param name="e">Paginate Event Arguments</param> protected void Paginate(object sender, PaginateEventArgs e) { pages.Clear(); viewManager = new C1RichTextViewManager { Document = rtb.Document, PresenterInfo = rtb.ViewManager.PresenterInfo }; PrintDocument printDoc = (PrintDocument)sender; // Report the number of preview pages printDoc.SetPreviewPageCount(rtb.ViewManager.Presenters.Count, PreviewPageCountType.Intermediate); } /// <summary> /// This is the event handler for PrintDocument.GetPrintPreviewPage. It provides a specific print preview page, /// in the form of an UIElement, to an instance of PrintDocument. PrintDocument subsequently converts the UIElement /// into a page that the Windows print system can deal with. /// </summary> /// <param name="sender">PrintDocument</param> /// <param name="e">Arguments containing the preview requested page</param> protected void GetPrintPreviewPage(object sender, GetPreviewPageEventArgs e) { // Add the first page if (e.PageNumber == 1) AddOnePrintPreviewPage(0); PrintDocument printDoc = (PrintDocument)sender; printDoc.SetPreviewPage(e.PageNumber, pages[e.PageNumber - 1]); // Add the other pages if (e.PageNumber == 1) for (int i = 1; i < viewManager.Presenters.Count; i++) AddOnePrintPreviewPage(i); } /// <summary> /// This is the event handler for PrintDocument.AddPages. It provides all pages to be printed, in the form of /// UIElements, to an instance of PrintDocument. PrintDocument subsequently converts the UIElements /// into a pages that the Windows print system can deal with. /// </summary> /// <param name="sender">PrintDocument</param> /// <param name="e">Add page event arguments containing a print task options reference</param> protected void AddPrintPages(object sender, AddPagesEventArgs e) { // Loop over all of the pages and add each one to be printed foreach (FrameworkElement page in pages) { printDocument.AddPage(page); } PrintDocument printDoc = (PrintDocument)sender; // Indicate that all of the print pages have been provided printDoc.AddPagesComplete(); } void AddOnePrintPreviewPage(int index) { var page = (FrameworkElement)printTemplate.LoadContent(); page.DataContext = viewManager.Presenters[index]; if (!pages.Contains(page)) pages.Add(page); }

   
   

In this step, you added application code. In the next step, you'll run the application.