MSDN Magazine - February 2009 - (Page 27)

Also note that users can ultimately clear the storage at any time since they have full control over their settings. This means that data stored in isolated storage should not be considered guaranteed persistent storage. Another good example is storing a list of U.S. states in isolated storage so a Web request (and database hit) does not have to be made every time a combobox needs to be filled with a list of U.S. states. Figure 8 Reading Serialized Data from an Isolated Storage File private List GetFeedsFromStorage_UsingFile() { byte[] feedBytes; var ms = new MemoryStream(); using (var isoStore = solatedStorageFile.GetUserStoreForApplication()) { if (!isoStore.FileExists(FEED_FILENAME)) return null; using (var stream = isoStore.OpenFile(FEED_FILENAME, FileMode.Open, FileAccess.Read)) { while (true) { byte[] tempBytes = new byte[1024]; int read = stream.Read(tempBytes, 0, tempBytes.Length); if (read <= 0) { //feedBytes = ms.ToArray(); break; } ms.Write(tempBytes, 0, read); } } feedBytes = ms.ToArray(); List feedList = Deserialize(typeof(List ), feedBytes) as List ; return feedList; } } private void LoadFeedsFromStorage_UsingFile() { var feedList = GetFeedsFromStorage_UsingFile(); foreach (var address in feedList) { Uri feedUri; Uri.TryCreate(address, UriKind.Absolute, out feedUri); if (feedUri != null) LoadFeed(feedUri); } } Wrap-Up The sample application demonstrates how easy it is to load RSS and AtomPub feeds into a Silverlight application. Silverlight makes it possible to make a Web request, accept its results, handle crossdomain policy calls, load feed data into SyndicationFeed classes, query them with LINQ, bind them to UI elements, and store feed data in isolated storage. Both last month and this month, Hanu Kommalapati covered building a line-of-business application with Silverlight, which you can read about in his articles “Silverlight: Build Line-Of-Business Enterprise Apps with Silverlight, Part 1” (msdn.microsoft.com/magazine/ dd315415) and Part 2 (msdn.microsoft.com/magazine/dd349332). JOHN PAPA (johnpapa.net) is a Senior Consultant with ASPSOFT (aspsoft.com) and a baseball fan who spends summer nights rooting for the Yankees with his family. John, a C# MVP and INETA speaker, has authored several books and is now working on his latest, titled Data-Driven Services with Silverlight 2. He often speaks at conferences such as DevConnections and VSLive. BEST MINDS. BEST INFORMATION. BEST ATTENDED. BEST BE THERE. Hilton La Jolla Torrey Pines, San Diego, CA February 2-4, 2009 30 of the top Microsoft MVPs, Product Team Members, and SharePoint experts in one place. Renowned keynote speaker Joel Oleson. Insights and advice from the likes of Bill English, Ben Curry, Todd Bleeker, Todd Klindt, Mike Watson and more. Six tracks of invaluable “insider know-how” you can’t get anywhere else, for SharePoint pros at every level: developers and designers, information workers, architects and taxonomists, IT pros, project managers, CIOs. Space is limited and demand is high, so don’t wait: register today for the one SharePoint conference you cannot miss. Register today: www.sharepointbestpractices.com February 2009 27 msdnmagazine.com http://msdn.microsoft.com/magazine/dd315415 http://msdn.microsoft.com/magazine/dd315415 http://msdn.microsoft.com/en-us/magazine/dd434653.aspx http://www.johnpapa.net http://www.aspsoft.com http://www.sharepointbestpractices.com http://www.msdnmagazine.com

Table of Contents Feed for the Digital Edition of MSDN Magazine - February 2009

MSDN Magazine - February 2009 Contents Toolbox CLR Inside Out Data Points Cutting Edge Patterns In Practice Best Practices .Net Interop "Oslo" Basics Patterns Silverlight Under The Table Foundations Windows With C++ .NET Matters Going Places { End Bracket }

MSDN Magazine - February 2009

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