THE MICROSOFT JOURNAL FOR DEVELOPERS JANUARY 2014 VOL 29 NO 1 magazine Error-Handling Techniques in WinJS...........22 Create mobile apps with HTML5, JavaScript and Visual Studio DevExtreme Mobile is a single page application (SPA) framework for your next Windows Phone, iOS and Android application, ready for online publication or packaged as a store-ready native app using Apache Cordova (PhoneGap). With DevExtreme, you can target today’s most popular mobile devices with a single codebase and create interactive solutions that will amaze. Get started today… ・ Leverage your existing Visual Studio expertise. ・ Build a real app, not just a web page. ・ Deliver a native UI and experience on all supported devices. ・ Use over 30 built-in touch optimized widgets. Learn more and download your free trial devexpress.com/mobile All trademarks or registered trademarks are property of their respective owners. 0114msdn_CoverTip.indd 1 12/12/13 10:11 AM 0114msdn_CoverTip.indd 2 12/12/13 10:12 AM THE MICROSOFT JOURNAL FOR DEVELOPERS JANUARY 2014 VOL 29 NO 1 magazine Error-Handling Techniques in WinJS...........22 Build More Effi cient Windows Store Apps COLUMNS Using JavaScript: Error Handling WINDOWS WITH C++ Eric Schmidt ....................................................................22 Using Regular Expressions with Modern C++ Introducing Visual Studio Online Kenny Kerr 6 Ed Blankenship ................................................................32 DATA POINTS Code First Goodies Build Fault-Tolerant Composite Applications in Entity Framework 6 Ivan Krivyakov.................................................................40 Julie Lerman 12 TEST RUN Create Modern Microfi che Frequent Item-Sets for with the Chronicling America API Association Rule Learning James McCaffrey 70 Tim Kulp .........................................................................50 THE WORKING Troubleshooting Applications with IIS Logs PROGRAMMER Eduardo Sanabria .............................................................60 Getting Started with Oak: Database Interaction Unit Testing SQL Server OLAP Ted Neward 76 Cubes Using C# DON’T GET ME STARTED The Steam Drill Mark Nadelson ................................................................64 David Platt 80 Untitled-7 2 12/10/13 1:08 PM Untitled-7 3 12/10/13 1:07 PM ® JANUARY 2014 VOLUME 29 NUMBER 1 magazine Instantly Search MOHAMMAD AL-SABT Editorial Director/[email protected] KENT SHARKEY Site Manager Terabytes of Text MICHAEL DESMOND Editor in Chief/[email protected] DAVID RAMEL Technical Editor 25+ fielded and full-text search types SHARON TERDEMAN Features Editor WENDY HERNANDEZ Group Managing Editor dtSearch’s own document filters SCOTT SHULTZ Creative Director support “Office,” PDF, HTML, XML, ZIP, JOSHUA GOULD Art Director SENIOR CONTRIBUTING EDITOR Dr. James McCaffrey emails (with nested attachments), and CONTRIBUTING EDITORS Rachel Appel, Dino Esposito, Kenny Kerr, Julie Lerman, Ted Neward, Charles Petzold, David S. 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Ask about fully-functional evaluations The Smart Choice for Text Retrieval ® since 1991 www.dtSearch.com 1-800-IT-FINDS Printed in the USA Untitled-1 1 11/26/12 3:02 PM EDITOR’S NOTE MICHAEL DESMOND WinJS Takes the Next Step We recently surveyed MSDN Magazine readers and found that, Visual Studio 2013, which delivers key tooling improvements, with the exception of C#, more companies report working with including the ability to track down errors within chains of JavaScript than any other programming language—more than Java, asynchronous calls—an important capability given that WinJS apps more than C/C++, more than Visual Basic. So it should come as frequently chain promises to each other. no surprise that this month’s issue focuses on JavaScript develop- “When one of those promises errors out, you either need to ment for Windows Runtime. have an onError parameter for each promise in the chain, or you In his lead feature, “Build More Effi cient Windows Store Apps need to track down the error starting from the last promise in the Using JavaScript: Error Handling,” Eric Schmidt dives into some chain,” explains Schmidt, who says both approaches are time con- fundamental concepts of the Windows Library for JavaScript suming. “Th e Tasks pane, which has been extended to encompass (WinJS), including promises, asynchronous debugging, and error JavaScript code in Visual Studio 2013, really helps developers track handling. As Schmidt notes in an interview, the tooling and capa- down those errors in their code,” he notes. bilities of WinJS diff er from JavaScript in that the environment is Th e latest version of WinJS and its attendant tooling deliver what tailored for full-fl edged app development, rather than for Web sites. Schmidt describes as “ready to go” templates and controls that help And these diff erences are important to understand when ensuring streamline development. Th e updates also deliver signifi cant per- that fl aws in code and logic are properly handled. formance improvements and streamlined WinJS app development. “We provided new tools in Visual Studio 2013 for measuring HTML UI responsiveness, JavaScript memory usage, JavaScript Schmidt describes the JavaScript function timing and asynchronous debugging,” Schmidt says. “In the platform, we improved the performance of some of our existing window.onerror event as controls—for example, ListView—with APIs like the Dispose pattern and the Scheduler, as well as provided new controls that are “the catchall for error handling” better suited for specifi c tasks—for example, the Repeater control.” Speaking of performance improvements, next month Schmidt for Web apps. will publish a follow-on article focused