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In the Loaded event handler of the PhotoItem control, you query the Items property on the selected WIADevice, acquire only the JPEG images, wrap the filtered collection into a PagedCollectionView, and set it as the PhotoPager source You also set the PageSize on the PhotoPager to one, ensuring that the user pages forward or backward for each image You then call ShowPhoto() In ShowPhoto(), you invoke the Transfer() COM method on the current WIAItem on the bound PagedCollectionView, which transfers the physical image as a WIAImageFile instance to the computer from the device You then bind the WIAImageFileFileData property to the Photo Image control shown in Listing 8-13 You call ShowPhoto() once every time a user pages through the DataPager to transfer and display other images.

As you can also see in the XAML in Listing 8-13, a value converter named WIAImageFileToBitmapConverter is used in the image binding to convert the raw image data to a Silverlight bitmap We do not list that code here, but you can find the converter in the PhotoItemsxamlcs file in the sample project for this recipe..

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Listing 8-15 shows the code to save an image to the disk. Listing 8-15. Saving an image to the disk private void btnSave_Click(object sender, RoutedEventArgs e) { //get the current WIAItem WIAItem itm = ((PhotoPager.Source as PagedCollectionView). CurrentItem as WIAItem); //get the raw data byte[] FileData = Photo.DataContext as byte[]; //get the filename from the Item Properties collection string filename = itm.Properties.ToList().Where((wiaprop) => wiaprop.Name == "Item Name").Select((wiaprop) => (string)wiaprop.Value).FirstOrDefault(); //create a file FileStream fs = File.Create( System.IO.Path.Combine( Environment.GetFolderPath(Environment.SpecialFolder.MyPictures), filename + ".jpeg")); //write fs.Write(FileData, 0, FileData.Length); //close file fs.Close(); } As you can see in the code shown in bold, you first obtain a target path for the file by combining the path to the MyPicture special folder with the file name obtained from the Item Name WIA property on the current WIAItem. You then use the well-known FileStream API to write the data to the file on the file system, just as you would in a regular desktop .Net application.

If you refer back to the code in Listing 8-13, you will note that when you handle a device connection event, you optionally display a notification window if the main application window is minimized. Figure 8-13 shows this notification window in action.

Note For more information on FCKeditor, visit the project s web site: http://www.fckeditor.net/

Figure 8-13. Notification window showing a device connected event Silverlight 4 introduces the NotificationWindow type that enables this scenario. The NotificationWindow type exposes a Content property that you can set to any content in your application, and it exposes a Show() method that can be invoked with a timeout parameter in milliseconds so that the notification remains displayed for the specified timeout. As you can see in Listing 8-13, you create your NotificationWindow instance, set it to some content that displays the device connection notification, and then show it for 30 seconds.

Many of the public Silverlight sites are media-focused as a result of Silverlight s strong client-side media capabilities, such as HD video coupled with a Windows Media Services or a smooth streaming back end. Many other sites also publish interactive content beyond video; but for corporate development support of traditional Create, Read, Update, and Delete (CRUD) applications as well as data-driven rich Internet applications, you need a strong control set with rich data support.

Silverlight 3 introduced additional controls for line-of-business (LOB) application development. In addition, Silverlight 3 introduced the new Silverlight Navigation Application project template, which provides a great starter application for a LOB application. We covered the Silverlight Navigation Application basics in 6 because it also provides great integration with the browser history and support for direct page links. Silverlight 4 builds on these capabilities with improved data-oriented controls as well as new controls such as the RichTextBox control to display, enter, and edit rich text and the WebBrowser control for hosting HTML within an out-of-browser (OOB) application. Speaking of which, Silverlight 4 greatly improves OOB functionality to enhance LOB development. We cover the details of OOB development in 8 but here are some highlights related to LOB development: HTML hosting in the WebBrowser control Pop-up alerts with the NotificationWindow class Support for elevated trust to the underlying platform

Other LOB-related enhancements in Silverlight 4 are drag-and-drop, clipboard access, right-click mouse events, and printing. A major step forward is much better support for Commanding, which allows developers to more easily implement Model-View-ViewModel applications when building datadriven applications.

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