Managed Extensibility Framework (MEF)

1. Managed Extensibility Framework (MEF) Mohamed Meligy Code: 02F01

2. Extensibility Extensions

5. Web App Stock Quotes Authenticator Error Handler Logger Database This example was created by Jim Weirich in Ruby on his blog. See his original article http ://onestepback.org/index.cgi/Tech/Ruby/DependencyInjectionInRuby.rdoc

15. DIContainer container = new DIContainer(); container.Register<ILogger, Logger>(); container.Register<IDatabase, Database>(); container.Register<IErrorHandler, ErrorHandler>(); container.Register<IQuotes, StockQuotes>(); container.Register<IAuthenticator, Authenticator>(); container.Register<IWebApp, WebApp>();

23. Application ToolWindow A ToolWindow B Contacts Call Support Help File Edit View Tools Help

24. Application Extension A Extension B Need a Toolwindow Got a Toolwindow Need Menus Got a Menu Need a MenuService Got a MenuService

26. Windows And Menus With MEF public interface IToolWindow { } public interface IMenuService { } public interface IMenu { } public class Application { [ Import ] public IEnumerable < IToolWindow > ToolWindows { get ; set ; } [ Import ] public IEnumerable < IMenu > Menus { get ; set ; } } [ Export ( typeof ( IMenuService ))] public class MenuService : IMenuService { }

27. Windows And Menus With MEF [ Export ( typeof ( IToolWindow ))] public class SomeToolWindow : IToolWindow { [ Import ] public IMenuService MenuService { get ; set ; } } [ Export ( typeof ( IMenu ))] public class SomeMenu : IMenu {}

28. First, The Composable Part Part A

29. Parts Relate Through Contracts Part B Part A

30. Imports Are Contracts A Part Needs Part B Import Import

31. Exports Are Contracts A Part Offers Export Export Part B

32. The Container Is The Matchmaker Container

33. Container Queries Catalogs Catalog Container

34. Parts Can Load Lazily Part B Part A Export <A>

35. Parts Can Have Different Lifetimes Container Container Part A Singleton Part A Part A Part A Factory