MSDN Magazine

102 Pages·2011·21.63 MB·English

THE MICROSOFT JOURNAL FOR DEVELOPERS APRIL 2011 VOL 26 NO 4
WINDOWS AZURE COLUMNS
TOOLBOX
F# Tools and Resources
Introducing the Windows Azure
Terrence Dorsey page 8
AppFabric Caching Service
CUTTING EDGE
Karandeep Anand and Wade Wegner ........................................ 26 Give Your Classes
a Software Contract
CQRS on Windows Azure
Dino Esposito page 12
Mark Seemann ......................................................................... 36
DATA POINTS
Parsing Log Files with F#, MapReduce Composing WPF DataGrid
Column Templates for a
and Windows Azure Better User Experience
Noah Gift ................................................................................ 44 Julie Lerman page 20
MOBILE MATTERS
PLUS:
Windows Phone Navigation,
Visual Studio TFS Team Project Part 2: Advanced Recipes
Yochay Kiriaty and
and Collection Guidance Jaime Rodriguez page 82
Willy-Peter Schaub and Mike Schimmel ..................................... 50 UI FRONTIERS
Lissajous Animations in Silverlight
Use Bee Colony Algorithms to
Charles Petzold page 88
Solve Impossible Problems
DON’T GET ME STARTED
James McCaffrey ...................................................................... 56 The Cat Butt Factor
David Platt page 96
Introduction to WebMatrix
Clark Sell ................................................................................. 72
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Untitled-7 2 11/10/10 10:59 AM
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Untitled-7 3 11/10/10 10:59 AM
Untitled-2 2 3/8/11 10:21 AM
Untitled-2 3 3/8/11 10:21 AM
magazine
APRIL 2011 VOLUME 26 NUMBER 4
LUCINDA ROWLEY Director
KIT GEORGE Editorial Director/[email protected]
KERI GRASSL Site Manager
KEITH WARD Editor in Chief/[email protected]
TERRENCE DORSEY Technical Editor
DAVID RAMEL Features Editor
WENDY GONCHAR Managing Editor
KATRINA CARRASCO Associate Managing Editor
SCOTT SHULTZ Creative Director
JOSHUA GOULD Art Director
CONTRIBUTING EDITORS K. Scott Allen, Dino Esposito, Julie Lerman, Juval
Lowy, Dr. James McCaffrey, Ted Neward, Charles Petzold, David S. Platt
Henry Allain President, Redmond Media Group
Matt Morollo Vice President, Publishing
Doug Barney Vice President, Editorial Director
Michele Imgrund Director, Marketing
Tracy Cook Online Marketing Director
ADVERTISING SALES: 508-532-1418/[email protected]
Matt Morollo VP, Publishing
Chris Kourtoglou Regional Sales Manager
William Smith National Accounts Director
Danna Vedder Microsoft Account Manager
Jenny Hernandez-Asandas Director Print Production
Serena Barnes Production Coordinator/[email protected]
Neal Vitale President & Chief Executive Offi cer
Richard Vitale Senior Vice President & Chief Financial Offi cer
Michael J. Valenti Executive Vice President
Abraham M. Langer Senior Vice President, Audience Development & Digital Media
Christopher M. Coates Vice President, Finance & Administration
Erik A. Lindgren Vice President, Information Technology & Application Development
Carmel McDonagh Vice President, Attendee Marketing
David F. Myers Vice President, Event Operations
Jeffrey S. Klein Chairman of the Board
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EDITOR’S NOTE
KEITH WARD
Cancel This!
Do you develop Web sites that actively push users away? “Of course if I missed something on the Web site—was there a way to cancel
not!” you respond. “What kind of addlepated fool would do that?” my subscription online that I didn’t see? Was I just dumb (always
Maybe, uh, you—if you do one or more of these things, either at the a possibility with me)?
behest of your boss(es), or because you think it will help drive sales. “No,” said the friendly voice on the other side. “Th ere’s no way to
Th e thing that drove me away from a sports-related Web site last cancel your subscription on the Web site.”
week was the simple act of trying to cancel my “premium content” I thought I must have misheard. So, you can sign up on the site—
subscription. So I logged in to my account and looked up Settings. in fact, signing up and providing a credit-card number is as easy as
I looked under my Subscriptions. I found my subscription. taking a bite of cheesecake—but you can’t cancel in the same way?
Th en I looked around for how to cancel it. Nada. Th ere was a veri-
table buff et of tabs: Profi les, Messages, Groups, Blogs and more. I
Feeling a bit like Theseus,
decided to click on Edit Profi le. Sensible enough, right? My Profi le
should include information about my subscription, and a way to cancel.
I wandered further into the labyrinth.
El zippo—nothing useful there.
OK, where to next? Hmm, let’s try Member Services. Surprise—
more links! Th ey included yet another Profi le section, among other
goodies. I didn’t have any luck in the previous Profi le section, so Th at’s right, I was told. Th en she tried to sell me on an even cheaper
maybe this one had some deeper level of information, including version of my subscription. How thoughtful of her.
how to cancel my account. To her credit, the lady was very professional and polite. So I
Nope. Disappointed yet again. responded, just as politely (I hope), to pass along my complaint
Aha! Account Information. Th at had to be it, especially as one about this sneaky, money-grubbing Web site and the company
of the categories was Payment Methods. It did have lots of account that produces it. She said she would.
information, including Payment Methods, which listed some old And maybe she even did. Of course, I’m sure my complaint was
credit cards and a new one. Yikes—I didn’t know that old informa- placed in the “round fi le” equivalent of their e-mail system.
tion was still there, so I deactivated all my old cards. So, aft er a long while of clicking around in a vain eff ort to fi nd
I fi gured if I deactivated all my cards, my subscription would be a way to delete my subscription, I called a hard-to-locate phone
automatically cancelled. But no: I couldn’t deactivate the current number, hoping that there might be a way to cancel. I lucked into
credit card. Because, of course, I needed some way to pay for the the right number, and canceled. But, again, nowhere on the Web site
subscription I no longer wanted. was I told how to cancel my subscription. Nary a word.
So, feeling a bit like Th eseus, I wandered further into the labyrinth. Although I’m certain this company would give some long-winded
I did searches on “cancel my subscription” and other phrases. rationale for this Web site design, there is, of course, just one reason
If you’re guessing that I didn’t fi nd what I’m looking for, give for it: Th ey hope you get tired of looking, and give up the idea of
yourself a one-handed clap. canceling because it’s not worth it. Th row up enough barriers, and
Finally, I located a customer service number. Note that I didn’t fi nd any hope the poor schlub gets tired of scaling or going around them.
number, link or written description of any kind that mentioned cancel- Word of advice: Don’t do this to your users. Don’t treat them like
ing a subscription or account; I just stumbled across a phone number. suckers. Don’t try to bleed them in this cynical manner. All you’ll
I called. Aft er a bit of shuffl ing around, I talked to someone who do is lose a customer forever.
cancelled my subscription. Th inking that this was ridiculous, I asked Th e Golden Rule comes to mind.
Visit us at msdn.microsoft.com/magazine. Questions, comments or suggestions for MSDN Magazine? Send them to the editor: [email protected].
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6 msdn magazine
Untitled-11 1 3/4/11 2:53 PM
TOOLBOX
TERRENCE DORSEY
F# Tools and Resources
F# is a new functional, type-safe programming language for the
Microsoft .NET Framework. Developed at Microsoft Research, it’s
based on Objective Caml, or OCaml, which is in turn based on ML.
The creator of F#, Don Syme, calls it “a synthesis between type-safe,
scalable, math-oriented scripting and programming for .NET.”
It may be a relatively young language, but F# has quickly developed
a cult following within the programming community. Perhaps that’s
because F# lets you build on familiarity with the .NET Framework and
Visual Studio. Perhaps it’s because F# combines functional, imperative
and object-oriented programming techniques in a single language.
Or perhaps it’s because F# is a strongly typed language that also
supports the fl exibility of compile-time typing.
Whichever aspects of the language appeal to you, here’s a guide
to the tools and resources that will help you get the most out of F#.
VSLab Math Visualizations in Visual Studio
Getting Started
If you’re using Visual Studio 2010 and the .NET Framework 4, you’ve And if you’re a die-hard Emacs user, don’t despair: Laurent Le
already installed all the tools you need to start playing with F# 2.0. Brun is working on F# IntelliSense in Emacs (bit.ly/f3pd8b). Watch his
You can also download a standalone installer for the F# 2.0 tools blog for details.
(bit.ly/fGVQvl) if you want to use F# in a previous version of Visual
Studio or in other development environments. Tools, Templates and Libraries
Your next stop for learning about F# should be the Microsoft F# There are a variety of tools available to make F# easier and more
Developer Center (msdn.microsoft.com/fsharp). Here you’ll fi nd docu- powerful. Your fi rst download should probably be the F# PowerPack
mentation, links to examples, blog posts from F# experts and more. (fsharppowerpack.codeplex.com) from the F# development team. The
Your core resource is going to be the F# Language Reference PowerPack includes source for the F# compiler and code library, plus
(msdn.microsoft.com/library/dd233181) in the MSDN Library. This has all a number of additional tools and libraries. Among them are a
the language details, along with sample code. Matrix library, tools for lexing and parsing, LINQ-based data access
and tools for documenting F# libraries.
Development Environments FAKE (github.com/forki/FAKE) is a build-automation system for F#
As mentioned earlier, Visual Studio 2010 has deep support for F# designed with inspiration from tools like make and rake. FAKE lets you
right out of the box. But if you want to experiment with the language leverage both functional programming techniques and direct access
on other machines, or even other OSes, head over to the Try F# to .NET assemblies while also integrating directly with the editing and
Web site (tryfs.net), where you can interactively code using F# in a debugging features of F#-aware IDEs like Visual Studio and SharpDevelop.
browser-based interpreter. Head over to CodePlex to fi nd a couple of handy testing tools:
Those without Visual Studio can grab a trial download as a standalone TickSpec (tickspec.codeplex.com) is a Behavior-Driven Development
app or virtual machine from Microsoft (msdn.microsoft.com/vstudio/bb984878). framework that lets you describe behaviors in Gherkin (given, when,
Aside from Visual Studio, there are a number of other free and then), and then execute the behaviors against C# and F# methods.
commercial IDEs that directly support F# development. These FsUnit (fsunit.codeplex.com) is a unit-testing library. Simply drop the
include SharpDevelop (sharpdevelop.net/OpenSource/SD), xacc.ide FsUnit.fs fi le into your project, then start writing test fi xtures and tests.
(xacc.wordpress.com) and MonoDevelop (monodevelop.com). And FsCheck (fscheck.codeplex.com) is a randomized testing
A unique aspect of MonoDevelop is that it enables you to set up framework based on the Haskell QuickCheck project that lets you
your development environment on Windows, Mac OS X or Linux and write your test specifi cations in F#, C# or Visual Basic.
target .NET Framework-based applications to those platforms in If you’re interested in Windows Phone 7 development, go to the
addition to Android, iOS and Windows Phone 7. Functional Variations Visual Studio Gallery and grab the F# Library for Windows Phone
has details on getting the F# features running; see “Installing and using (XNA) template (bit.ly/h5sg9h) and F# and C# Win Phone App
F# in MonoDevelop” (functional-variations.net/monodevelop). Robert (Silverlight) template (bit.ly/fraF4S) for Visual Studio.
Pickering also has a guide to using F# on Mac OS X and Linux with Speaking of Visual Studio again, here are two great projects that
Mono (strangelights.com/fsharp/MonoLinux.aspx) on his F# Resources blog. will make working with F# much easier: F# Project Extender
8 msdn magazine