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Users can leverage the browser printing capabilities to print Silverlight applications in Silverlight 3 but there are many situations where LOB applications need to have customized printing. Silverlight 4 includes the new PrintDocument class to provide printing capabilities to Silverlight applications. After you add a PrintDocument object to the application, you can call the Print() method in a Button event handler. It is required that all dialog boxes in Silverlight must be user-initiated, otherwise a SecurityException will occur. To perform the print operation, you handle the PrintPage event for the PrintDocument object. In the PrintPage event handler, set the PrintPageEventArgs.PageVisual property to the root UIElement that you want to print. So, if you want to print a single object like a DataGrid, you can set it on the PageVisual property. If you want to print a whole set of controls configured on a Grid, you set the PageVisual property to the Grid and all of its child controls will be printed as well. To print multiple pages, you can set the PrintPageEventArgs.HasMorePages to true and the PrintPage event will fire again until HasMorePages is set to false. If you need to print a multi-page document, you can handle the BeginPrint event where you can page the data in a multipage document to the next page so that it is ready to be printed when PrintPage fires. You can perform post-printing clean up as well as check for errors in the EndPrint event.

To add printing support, you add a using clause for the System.Windows.Printing namespace. Next, declare an instance of the PrintDocument class and a few variables to keep track of current printing (currentpagePrinting) page and the page (savedPageNum) you should reset to after printing. You wire up the PrintPage event to your PrintDocument variable, which is where most of the action happens. In the PrintPage event handler, you set the PageVisual value to the CustomersDataGrid. Next, you have some logic to page through the data in order to print out all of the records. Listing 9-8 has the code. Listing 9-8. The Recipe 9-10 MainPage.Xaml.cs File using using using using System; System.Windows; System.Windows.Controls; System.Windows.Printing;

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//pet info Listbox lbx = (Listbox)getFellow("products"); Product product = (Product) getProducts().get(lbx.getSelectedIndex()); String productId = product.getProductID(); String petName = ((Textbox)getFellow("petName")).getValue(); String description = ((FCKeditor)getFellow("description")).getValue(); BigDecimal price =((Decimalbox)getFellow("price")).getValue() .setScale(2, BigDecimal.ROUND_HALF_UP); String tags = ((Textbox)getFellow("tags")).getValue(); //contact info String firstName = ((Textbox)getFellow("firstName")).getValue(); String lastName = ((Textbox)getFellow("lastName")).getValue(); Chen

namespace Ch09_LOBApplications.Recipe9_10 {

public partial class MainPage : UserControl { PrintDocument pd = new PrintDocument(); int currentpagePrinting = 1; int savedPageNum = 0; public MainPage() { InitializeComponent(); CustomerDataForm.CommandButtonsVisibility = DataFormCommandButtonsVisibility.All; pd = new PrintDocument(); pd.PrintPage += new EventHandler<PrintPageEventArgs>(pd_PrintPage); } void pd_PrintPage(object sender, PrintPageEventArgs e) { e.PageVisual = CustomersDataGrid; if (currentpagePrinting <= CustomerPager.PageCount) { e.HasMorePages = true; currentpagePrinting++; CustomerPager.PageIndex = currentpagePrinting; } else { e.HasMorePages = false; CustomerPager.PageIndex = savedPageNum; } CustomersDataGrid.UpdateLayout(); } private void ButtonCommitToServer_Click(object sender, RoutedEventArgs e) { if (CustomersDomainDataSource.HasChanges && !CustomersDomainDataSource.IsBusy) CustomersDomainDataSource.SubmitChanges(); } private void PrintButton_Click(object sender, RoutedEventArgs e) { pd.Print("Customer List");

currentpagePrinting = 1; savedPageNum = CustomerPager.PageIndex; CustomerPager.PageIndex = 1; CustomersDataGrid.UpdateLayout(); } } } For more information on multi-page printing, go to the Multipage printing lab at channel9.msdn.com/learn/courses/Silverlight4/SL4BusinessModule6/SL4LOB_06_Printing_the_Sched ule/

If you are a developer or a digital content producer of any kind, you probably have already built or are thinking of building applications that integrate video, audio, or other kinds of digital media with the resulting end-user experience The ability to integrate rich media into web applications is one of the strongest and most publicized features of Silverlight, and it is the focus of the recipes in this chapter Silverlight supports playing Windows Media Video (WMV) version 7 through version 9, including the Windows Media implementation of the Society of Motion Picture and Television Engineers (SMPTE) VC1 high-definition video standard, as well as H264 encoded media contained in an MP4 container structure, extending video format support to MP4 video as well as other MP4-derived containers such as H264 encoded QuickTime video.

String email = ((Textbox)getFellow("email")).getValue(); //seller's address String street1 = ((Textbox)getFellow("street")).getValue(); String city = ((Textbox)getFellow("city")).getValue(); String state = ((Textbox)getFellow("state")).getValue(); String zip = ((Textbox)getFellow("zipCode")).getValue();

Silverlight also supports MPEG Layer-3 (or MP3) audio and audio encoded in the Advanced Audio Coding (AAC) format, but it is currently limited to the AAC LC variant for two-channel stereo sound only Silverlight supports playing both client-side and server-side playlists Silverlight supports media acquisition over the HTTP and HTTPS protocols You can use the Microsoft Media Server (MMS) protocol, Real Time Streaming Protocol (RTSP), or RTSP using TCP (RTSPT) for media access, but Silverlight falls back to using HTTP when it encounters these protocol schemes Silverlight also supports accessing media through either progressive download or streaming mechanisms In this chapter, we discuss recipes that showcase the various media capabilities of Silverlight, especially those of a type named MediaElement that is central to Silverlight-based media integration Along the way, you will build a video player that evolves incrementally over the recipes to highlight specific features.

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