IT.Wox, always

"The Managed Extensibility Framework (MEF) simplifies the creation of extensible applications. MEF offers discovery and composition abilities that you can leverage to load application extensions." - (mef.codeplex.com)

How to get them both working together, is as below.

NOTE: I am assuming that the reader is aware of Dependency Injection pattern & the Common Service Locator.

The Steps:

1. Download the CommonServiceLocator_MefAdapter.4.0.zip file & extract the MefServiceLocator class written by Glen Block
2. Create a new ASP.Net MVC 2.0 Web Application Project
3. Include the MefServiceLocator class into this project
4. Open the Global.asax.cs file
5. Make the following code change in the Application_Start event:
   protected void Application_Start(){
   RegisterDIContainer();
   AreaRegisteration.RegisterAllAreas();
   RegisterRoutes(RouteTable.Routes);
   }
6. Write the RegisterDIContainer method as:
   protected void RegisterDIContainer(){
   var catalog = new AggregateCatalog(
   new AssemblyCatalog(Assembly.GetExecutingAssembly()),
   new DirectoryCatalog(Server.MapPath("~/Plugins"))
   );
   var composition = new CompositionContainer(catalog);
   composition.ComposeParts(this);
   var mef = new MefServiceLocator(composition);
   ServiceLocator.SetLocatorProvider(() => mef);
   }
7. With this in place, you are now good to do:
   var controllers = ServiceLocator.Current.GetAllInstances<IController>();

Code on...