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Although we focus on media-related types, APIs, and techniques, we assume that you are already familiar with the fundamentals of the programming model, XAML-based UI design, data binding, control design, and networking Consequently, in explaining the code in the recipes in this chapter, we focus purely on the media-related aspects and rely on you to understand the aforementioned concepts wherever they are used If you have not covered these topics in this book or elsewhere, we advise you to read s 2, 3, 4, 5, and 7, which help you prepare for the recipes in this chapter..

using System.Linq; using System.Windows; using System.Windows.Controls; namespace Ch02_ProgrammingModel.Recipe2_4 { public partial class MainPage : UserControl { public MainPage()

{ InitializeComponent(); } private void ButtonSelectFiles_Click(object sender, RoutedEventArgs e) { //Create dialog OpenFileDialog fileDlg = new OpenFileDialog(); //Set file filter as desired fileDlg.Filter = "Tiff Files (*.tif)|*.tif|All Files (*.*)|*.*"; fileDlg.FilterIndex = 1; //Allow multiple files to be selected (false by default) fileDlg.Multiselect = true; //Show Open File Dialog if (true == fileDlg.ShowDialog()) { StatusLabel.Text = fileDlg.Files.Count() + " file(s) selected"; foreach (var file in fileDlg.Files) { FileList.Items.Add(file.Name); } } } } }

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t happens all the time. We get a resume that everyone thinks is really exciting. Terrific grades. All kinds of powerful-sounding jobs. Lots of experience. Speaks seventeen languages. And saved over 10,000 kittens! Look! Kittens! And then I call them up, and I can t stand talking to them. Within ten minutes, I realize they are not going to make it as programmers. I ve had people with great resumes tell me a pointer should fit in one byte. Sometimes they just can t answer the simplest questions, or you feel like you have to wrestle the answers out of them. Before moving on to a full-fledged in-person interview, we usually use a phone screen to make sure that we re not wasting time and money on someone who is just seriously not smart. A phone screen has distinct advantages over a normal in-person interview. First, it s cheap. It takes forty-five minutes to an hour and actually

You need to work with XML data in Silverlight using the XmlReader object as well as work with XML data in Silverlight using LINQ, because you would like to work with the XML data as a collection of objects.

catalogFacade.addItem(item) method shown in Listing 6-15.

Use the XmlReader object along with the necessary objects in the related System.Xml namespace to retrieve XML data. Use the language features first introduced in C# 3.0 and the System.Xml and System.Linq namespaces to query XML data.

There are two ways to parse XML data in Silverlight: the XmlReader class and LINQ to XML, which is one of the new technologies that became available in .NET Framework 3.5 and later that we cover below. The XmlReader class is a fast-forward only, noncaching XML parser. For processing large XML files, XmlReader is better suited than LINQ to XML for performance reasons. The Silverlight XmlReader works in a similar manner as the XmlReader in the full version of the .NET Framework. Visit this site for details on the differences between the .NET Framework and the .NET Framework for Silverlight versions of XmlReader: msdn.microsoft.com/enus/library/cc189053(VS.95).aspx What is great about Silverlight is that it is a rich subset of the full .NET Framework 3.5 and that it includes LINQ. There are many web sites, blogs, and books that cover LINQ, so we won t dive into all the details here.

Note A great resource on LINQ is Joseph C. Rattz Jr. s Pro LINQ: Language Integrated Query in C# 2008

(Apress, 2007).

SellerContactInfo contactInfo = new SellerContactInfo (firstName, lastName, email); Item item = new Item(productId,petName,description, pictureURL,thumbURL,price,addr,contactInfo,0,0); Long itemId = catalogFacade.addItem(item);

The goal of the second part of this recipe is to show how to retrieve XML data using an XmlResolver, in this case the XmlXapResolver, which extracts XML from the xap, and then load the XML data into an XDocument object. You call XDocument.Load(XmlReader) to load the contents into an XDocument so that it can be queried using LINQ. The XDocument class, located in the System.Xml.Linq namespace, is the key object in LINQ to XML functionality.

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