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using System.Windows; using System.Windows.Controls; using System.Xml; namespace Ch02_ProgrammingModel.Recipe2_5 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private void ButtonReadXML_Click(object sender, RoutedEventArgs e) { XmlReaderSettings XmlRdrSettings = new XmlReaderSettings(); XmlRdrSettings.XmlResolver = new XmlXapResolver(); XmlReader reader = XmlReader.Create("ApressBooks.xml", XmlRdrSettings); // Moves the reader to the root element. reader.MoveToContent(); while (!reader.EOF) { reader.ReadToFollowing("ApressBook"); // Note that ReadInnerXml only returns the markup of the node's children // so the book's attributes are not returned. XmlData.Items.Add(reader.ReadInnerXml()); } reader.Close(); } } } For the second part of this recipe, you access XML data with LINQ to XML to avoid working with XmlDocument objects and walking the XML tree. Instead, you create a list of objects containing information on a few Apress books and display the data in a ListBox using a simple data template. We cover data templates in detail in chapter 4.

The relevant LINQ to XML functionality is located in the ApressBooks.cs class file. It contains an ApressBooks class that populates a List collection with another custom class called ApressBook, using the ApressBooks.RetrieveData method. The code in Listing 2-12 above is a bit more involved so let s go through it line by line. The private member variable backing the public ApressBookList property is declared like this: private List<ApressBook> _apressBookList; This section of code is the actual LINQ query: from b in xDoc.Descendants("ApressBook") select . The b variable is simply an anonymous type for retrieving a collection of objects from the XML file that are returned by the call to xDoc.Descendants("ApressBook"). The select keyword in the sample code creates an instance of the ApressBook class, but if you wanted to simply return a collection of strings containing the ISBN, you could use this code: from b in xDoc.Descendants("ApressBook") select b.Element("ISBN").Value Instead, you take advantage of LINQ functionality to streamline creating a collection of ApressBook objects by using this code: select new ApressBook() { Author = b.Element("Author").Value, Title = b.Element("Title").Value, ISBN = b.Element("ISBN").Value, Description = b.Element("Description").Value, PublishedDate = Convert.ToDateTime(b.Element("DatePublished").Value), NumberOfPages = b.Element("NumPages").Value, Price = b.Element("Price").Value, ID = b.Element("ID").Value } The select new code is simply creating an instance of a collection containing ApressBook objects using C# 3.0 object initializer functionality. The value used to set each property for the ApressBook objects is data retrieved from the XML document, such as b.Element("Author").Value. Figure 2-14 shows the test application for this recipe. Unlike in Recipe 2-1, where you demonstrated how to add a class reference to an application but did not specify a data template, you do implement a simple data template for the ListBox control here to show that the XML data is read in properly.

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Use the Application.UnhandledException event and the private ReportErrorToDom member function Error! Bookmark not defined for your application.

public MediaButtonsPanel() { this.DefaultStyleKey = typeof(MediaButtonsPanel); } public override void OnApplyTemplate() { btnPlay = GetTemplateChild("btnPlay") as ButtonBase; btnPause = GetTemplateChild("btnPause") as ButtonBase; btnStop = GetTemplateChild("btnStop") as ButtonBase; btnForward = GetTemplateChild("btnForward") as ButtonBase; btnRewind = GetTemplateChild("btnRewind") as ButtonBase; Root = Helper.FindRoot(this); MediaSource = Root.FindName(SourceName) as MediaElement; WireButtonEvents(); } private void WireButtonEvents() { if (btnPlay != null) btnPlay.Click += new RoutedEventHandler(btnPlay_Click); if (btnPause != null) btnPause.Click += new RoutedEventHandler(btnPause_Click); if (btnStop != null) btnStop.Click += new RoutedEventHandler(btnStop_Click); if (btnForward != null) btnForward.Click += new RoutedEventHandler(btnForward_Click); if (btnRewind != null) btnRewind.Click += new RoutedEventHandler(btnRewind_Click); } void btnRewind_Click(object sender, RoutedEventArgs e) { if (MediaSource != null && MediaSource.Position > TimeSpan.Zero) { MediaSource.Pause(); //5th of a second MediaSource.Position -= new TimeSpan(0, 0, 0, 0,200); MediaSource.Play(); } } void btnForward_Click(object sender, RoutedEventArgs e) {

Listing 6-21 defines the two sets of arrows: one pointing to the right and the other pointing to the left.

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