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Fun with ASP.NET MVC3, MEF and NuGet

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Fun with ASP.NET MVC3, MEF and NuGet

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So you have a team of developers… And a nice architecture to build on… How about making that architecture easy for everyone and getting developers up to speed quickly? Learn all about integrating the managed extensibility framework (MEF) and ASP.NET MVC with some NuGet sauce for creating loosely coupled, easy to use architectures that anyone can grasp.

So you have a team of developers… And a nice architecture to build on… How about making that architecture easy for everyone and getting developers up to speed quickly? Learn all about integrating the managed extensibility framework (MEF) and ASP.NET MVC with some NuGet sauce for creating loosely coupled, easy to use architectures that anyone can grasp.

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Fun with ASP.NET MVC3, MEF and NuGet

  1. 1. DECEMBER 12, 2011 | SLIDE 1
  2. 2. www.realdolmen.com FUN WITH ASP.NET MVC 3, MEF AND NUGET DECEMBER 12, 2011 | SLIDE 2
  3. 3. WHO AM I?  Maarten Balliauw  Antwerp, Belgium Me, looking  www.realdolmen.com intelligent with  Focus on web glasses  ASP.NET MVC, PHP, Azure, SignalR, …  MVP Windows Azure (formerly ASP.NET)  Co-founder of AZUG  http://blog.maartenballiauw.be  @maartenballiauw DECEMBER 12, 2011 | SLIDE 4
  4. 4. AGENDA  Technologies & techniques used  ASP.NET MVC 3  Managed Extensibility Framework (MEF)  NuGet  Creating application components  Building an application  Conclusion  Further information  Q&A DECEMBER 12, 2011 | SLIDE 5
  5. 5. ASP.NET MVC 3  All the new stuff:  Razor view engine  Global Action Filters  Unobtrusive Ajax & Client Validation  Better Visual Studio tooling  And a very interesting one for doing LEGO development:  Better support for Dependency Injection DECEMBER 12, 2011 | SLIDE 6
  6. 6. DEPENDENCY INJECTION? I need a var partA = “Part B” ! new PartA(new PartB()) Coming up! Me on a typical work day DECEMBER 12, 2011 | SLIDE 7
  7. 7. DEPENDENCY INJECTION? I need a Let me There “Part B” ! you go! see... Container DECEMBER 12, 2011 | SLIDE 8
  8. 8. WHAT ABOUT ASP.NET MVC 3?  ASP.NET MVC 3 uses DependencyResolver  : IDependencyResolver  GetService()  GetServices()  Register it on application start DECEMBER 12, 2011 | SLIDE 9
  9. 9. WHAT ABOUT ASP.NET MVC 3?  ASP.NET MVC will / can query the IDependencyResolver for  Controllers  Value providers  View engines & view pages  Model binders  Filters  Controller activator  Model validators  View page activator  Model metadata  Check Brad Wilson’s blog for examples on all of these  http://bradwilson.typepad.com/blog/2010/07/service- location-pt1-introduction.html DECEMBER 12, 2011 | SLIDE 10
  10. 10. in ASP.NET MVC 3 DEPENDENCY INJECTION DECEMBER 12, 2011 | SLIDE 11
  11. 11. MANAGED EXTENSIBILITY FRAMEWORK (MEF)  Cool as ICE: Import, Compose, Export [Import]IRule rule; MEF catalog [Export(typeof(IRule)] Let me There you go! see... DECEMBER 12, 2011 | SLIDE 12
  12. 12. MEF IN ASP.NET MVC 3  Build an IDependencyResolver  based on MEF container  Use  has a built-in IDependencyResolver  has a “Convention” model  is available on NuGet  mefcontrib.codeplex.com DECEMBER 12, 2011 | SLIDE 13
  13. 13. NUGET “NuGet is a Visual Studio extension that makes it easy to install and update open source libraries and tools in Visual Studio.” Publish your own packages + Create & use your own feed DECEMBER 12, 2011 | SLIDE 14
  14. 14. and finding it on NuGet USING MEFCONTRIB DECEMBER 12, 2011 | SLIDE 15
  15. 15. MEFCONTRIB.MVC3  Optional addition for  Adds some things to your application:  AppStart code that does the wiring  A CompositionDependencyResolver  Will check all assemblies in /bin  Will export everything : IController by convention DECEMBER 12, 2011 | SLIDE 16
  16. 16. CONVENTIONS BASED MODEL public class MvcApplicationRegistry : PartRegistry { public MvcApplicationRegistry() { Scan(x => { x.Assembly(Assembly.GetExecutingAssembly()); x.Directory(AppDomain.CurrentDomain.BaseDirectory + "bin"); }); Part() .ForTypesAssignableFrom<IController>() .MakeNonShared() .ExportTypeAs<IController>() .ExportType() .Imports( // ... ); } } DECEMBER 12, 2011 | SLIDE 17
  17. 17. THIS ALL MAKES ME THINK...  Package company components using NuGet?  Distribute them in a custom feed?  Use ASP.NET MVC 3?  Wire everything with MEF & MefContrib?  Pure application Lego! Me, thinking DECEMBER 12, 2011 | SLIDE 18
  18. 18. CREATING APPLICATION COMPONENTS DECEMBER 12, 2011 | SLIDE 19
  19. 19. WHAT’S NEXT?  Building it  MSBuild (or whatever! Nuget.exe is all that matters)  Hosting it Install-Package NuGet.Server  Create a NuGet server  Drop everything in a folder  Use a NaaS solution: www.myget.org  Using it  Reference the feed  Download & install components needed  Assemble using MEF (or another IoC) DECEMBER 12, 2011 | SLIDE 20
  20. 20. A QUICK COMMERCIAL PLUG  Create your own NuGet feed  Packages from official feed  Uploaded/pushed packages  No need to setup & maintain your own NuGet Server  Free! www.myget.org DECEMBER 12, 2011 | SLIDE 21
  21. 21. CREATING A PRIVATE NUGET FEED DECEMBER 12, 2011 | SLIDE 22
  22. 22. LET’S SEE IF WE CAN BUILD THIS... TPS Reports Cover Sheet Generator (ASP.NET MVC 3) Wired Domain layer Authentication Theme with MEF Domain.TpsReports AccountController Default theme Contracts Packaged as .nupkg And their implementations... DECEMBER 12, 2011 | SLIDE 23
  23. 23. Cover Sheet Generator BUILDING AN APPLICATION DECEMBER 12, 2011 | SLIDE 24
  24. 24. CONCLUSION  You can build an app like a Lego set  Requires “bricks” (NuGet packages)  Requires “glue” (MEF / MefContrib / IoC)  Requires you to think in terms of components  Structure is key!  Not a best-practice architecture  Just something we toyed with on a project  Proved to work (for the customer) DECEMBER 12, 2011 | SLIDE 25
  25. 25. FURTHER INFORMATION  On the Internet:  www.nuget.org  www.myget.org  mefcontrib.codeplex.com DECEMBER 12, 2011 | SLIDE 26
  26. 26. THANK YOU FOR JOINING Me, having a question DECEMBER 12, 2011 | SLIDE 27

Editor's Notes

  • Demo01_MVC_DependencyResolverAdd a property to the HomeController for specifying the welcome messageAdd a class “SimpleDependencyResolver.cs”Implement IdependencyResolver (use snippets for some parts)    public class SimpleDependencyResolver        : IDependencyResolver    {        public object GetService(Type serviceType)        {            if (serviceType == typeof(Controllers.HomeController))            {                var controller = Activator.CreateInstance(serviceType) as Controllers.HomeController;                controller.MessageText = &quot;Welcome, this text has been injected!&quot;;                return controller;            }            if (serviceType.IsInterface)            {                if (serviceType == typeof(IControllerFactory)) return new DefaultControllerFactory();                if (serviceType == typeof(IControllerActivator)) return null;                if (serviceType == typeof(IFilterProvider)) return GlobalFilters.Filters;                if (serviceType == typeof(IViewEngine)) return new RazorViewEngine();                if (serviceType == typeof(IViewPageActivator)) return null;            }            return Activator.CreateInstance(serviceType);        }        public IEnumerable&lt;object&gt; GetServices(Type serviceType)        {            return new object[] { GetService(serviceType) };        }    } Register dependencyresolver in App_Start:DependencyResolver.SetResolver(new SimpleDependencyResolver());
  • Maarten
  • Demo02_MefContribCreate a new MVC application (application template)Add an IHelloWorldService    public interface IHelloWorldService    {        string Hello();    } Add a HelloWorldService    [Export(typeof(IHelloWorldService))]    public class HelloWorldService        : IHelloWorldService    {        public string Hello()        {            return &quot;Hello from HelloWorldService!&quot;;        }    } Change HomeController     public class HomeController : Controller    {        private IHelloWorldService service;         [ImportingConstructor]        public HomeController(IHelloWorldService helloWorldService)        {            this.service = helloWorldService;        }         public ActionResult Index()        {            ViewBag.Message = this.service.Hello();             return View();        }         public ActionResult About()        {            return View();        }    } Run and fail…NuGet the MefContrib.MVC packageExplain the fact that it uses the /bin folder for part discoveryExplain the use of conventions
  • Initech.Components.Theming.DefaultThemeOpen solutionShow it’s nothing but a “plain old” MVC applicationRun the projectDemonstrate it does nothing, it’s just a template…Show the NuGet folder in Windows ExplorerOpen package.nuspec using NuGet Package ExplorerShow people around:Show the “Content” folder, this is where package contents will go. In this case, it will contain the Views, CSS and scripts.Show “lib”: it will contain assemblies (if appropriate for the package)Package.proj is the MSBUILD script that does the packagingOpen itSpecify some settings about what to copy and packageUpdate version number in nuspec fileRun nuget.exe on the nuspec fileAwesomeness!
  • Tonen aparte directoryTonen NuGet.ServerTonen MyGet.org
  • IniTech.TpsCoverSheetGeneratorCreate an empty MVC applicationAdd a library package reference to InitechThemeDefaultThemeUpdate _ViewStart.cshtml to use _InitechLayout.cshtmlAdd a HomeControllerAdd a viewRun the application to show off the templateRemove the view: we’ll generate that later onAdd library package reference (from command line?) to InitechDomainTpsReportsModify Index() action method:        public ActionResult Index()        {            return View(new TpsReportCoverSheet());        } Add POST action        [HttpPost]        public ActionResult Index(TpsReportCoverSheet model)        {            if (ModelState.IsValid)            {                return View(&quot;TpsReportCoverSheet&quot;, model);            }             return View(model);        } Add [Authorize] attributeAdd library package reference to InitechWebMvcAuthenticationDemonstrate it adds dependencies from NuGet as well as from Initech package repositoryWe need an implementation for the contracts… InitechAuthenticationMembershipDummy &amp; InitechAuthenticationFormsShow the app: almost no code, we just combined some building blocks… 
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