Fun with ASP.NET MVC 3, 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 …

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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  • 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 = "Welcome, this text has been injected!";                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<object> GetServices(Type serviceType)        {            return new object[] { GetService(serviceType) };        }    } Register dependencyresolver in App_Start:DependencyResolver.SetResolver(new SimpleDependencyResolver());
  • 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 "Hello from HelloWorldService!";        }    } 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!
  • 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("TpsReportCoverSheet", 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 & InitechAuthenticationFormsShow the app: almost no code, we just combined some building blocks… 

Transcript

  • 1.
  • 2. OPN07
    Fun with ASP.NET MVC 3, MEF and NuGet
    Maarten Balliauw
    Technical Consultant
    RealDolmen
    @maartenballiauw
  • 3. Notes (hidden)
    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 what’s this talk about?
    Show you how you can build an app like Lego
    Show you how you can create Lego blocks for your team
    This is NOT a “general recommended approach”, just an idea that proved to work at one of our customers.
  • 4. Who am I?
    Maarten Balliauw
    Antwerp, Belgium
    www.realdolmen.com
    Focus on web
    ASP.NET, ASP.NET MVC, PHP, Azure, …
    MVP ASP.NET
    http://blog.maartenballiauw.be
    @maartenballiauw
    Me, looking intelligent with glasses
  • 5. Agenda
    Technologies & techniques used
    ASP.NET MVC 3
    Managed Extensibility Framework (MEF)
    NuGet
    Creating application components
    Building an application
    Conclusion
    Further information
    Q&A
  • 6. 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
  • 7. var partA =new PartA(new PartB())
    Sidenote: Dependency Injection?
    I need a “Part B” !
    Coming up!
    Part A
    Me, doing actual software development
  • 8. Container
    Sidenote: Dependency Injection?
    I need a “Part B” !
    Let me see...
    There you go!
    Part A
    Part B
  • 9. How does this fit into ASP.NET MVC 3?
    ASP.NET MVC 3 uses DependencyResolver
    : IDependencyResolver
    GetService()
    GetServices()
    Register it on application start
  • 10. How does this fit in ASP.NET MVC 3?
    ASP.NET MVC will / can query the IDependencyResolver for
    Controllers
    View engines & view pages
    Filters
    Model validators
    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
    Value providers
    Model binders
    Controller activator
    View page activator
  • 11. Dependency Injection in ASP.NET MVC 3
    demo
  • 12. Managed Extensibility Framework (MEF)
    Cool as ICE: Import, Compose, Export
    [Import]Ilogger logger;
    MEF catalog
    HomeController
    [Export(typeof(Ilogger)]
    Let me see...
    There you go!
    ConsoleLogger
    MEF container
  • 13. Options for MEF in ASP.NET MVC 3
    Build an IDependencyResolver
    based on MEF container
    Use MefContrib
    has a built-in IDependencyResolver
    has a “Convention” model
    is available on NuGet
    mefcontrib.codeplex.com
  • 14. A brief NuGet introduction...
    Package management system for .NET
    Simplifies incorporating 3rd party libraries
    Developer focused
    Free, open source
    Use packages from the official feed
    Publish your own packages
    Create & use your own feed
  • 15. Using MefContrib
    And finding it. On NuGet.
    demo
  • 16. MefContrib.MVC3
    Optional addition for MefContrib
    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
  • 17. Conventions in MefContrib-MVC3
    public class MvcApplicationRegistry : PartRegistry { public MvcApplicationRegistry() {
    Scan(x => {
    x.Assembly(Assembly.GetExecutingAssembly());x.Directory(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "bin"));
    });
    Part()
    .ForTypesAssignableFrom<IController>()
    .MakeNonShared()
    .ExportTypeAs<IController>()
    .ExportType()
    .Imports( // ... ); }
    }
  • 18. 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, actually thinking
  • 19. Creating application components
    Initech Default Theme
    demo
  • 20. What’s next?
    Building it
    MSBuild (or whatever! Nuget.exe is all that matters)
    Hosting it
    Create a NuGet server
    Or drop everything in a folder
    Using it
    Reference the feed
    Download & install components needed
    Assemble using MEF (or another IoC)
    Install-Package NuGet.Server
  • 21. Let’s see if we can build this...
    Wiredwith MEF
    Packagedas .nupkg
  • 22. Building an application
    TPS ReportsCover Sheet Generator
    demo
  • 23. Conclusion
    You can build an app like a Lego set
    Requires “bricks” (NuGet packages)
    Requires “glue” (MEF / MefContrib / other 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)
  • 24. Further information
    For time travelers:
    FRM06 – Deconstructing Orchard – Bradley Millington – Lagoon L (Tuesday)
    FRM13 – Scaffolding – Steve Sanderson – Breakers H (Wednesday)
    Upcoming:
    FRM09 – NuGetIn Depth – Scott Hanselman & Phil Haack –Lagoon H (now)
    On the Internet:
    www.nuget.org
    mefcontrib.codeplex.com
  • 25. Thank you for joining & filling out the evals!
    Q&A
    http://blog.maartenballiauw.be
    @maartenballiauw
    Me, having a question
  • 26. OPN07
    Fun with ASP.NET MVC 3, MEF and NuGet
    Maarten Balliauw
    Technical Consultant
    RealDolmen
    @maartenballiauw
  • 27. © 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
    The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.