The document discusses the Managed Extensibility Framework (MEF) and how it can be used to create extensible applications in .NET. MEF allows third parties to extend applications through imports and exports. It decouples internal application components and allows overriding built-in defaults. MEF is part of .NET 4.0 but can be used on .NET 3.5 through a Codeplex project. The document provides an agenda on MEF basics, extensibility in .NET 2.0 versus MEF, demos of MEF functionality, and resources for additional information.

1. Creating extensible
application using MEF
@Ben_Hall
Ben@BenHall.me.uk
Blog.BenHall.me.uk

2. Agenda
• MEF ABCs
• Extensibility in .Net 2.0
• Extensibility with MEF
• MEF Internally

3. Managed Extensibility
Framework

4. http://www.flickr.com/photos/leon_homan/2856628778/

5. http://www.flickr.com/photos/zen/2273186263/

6. External and Internal

7. Sadly some companies don’t see
this as important!

8. Internal is about making your life
easier

10. http://www.flickr.com/photos/mag3737/1914076277/

11. MS-PL
http://www.flickr.com/photos/25501212@N05/2934269081/

13. http://www.flickr.com/photos/dunechaser/2918021174/

14. [Export]
I have something to offer

15. [Import]
I need something

16. Catalog
I know about some exports

17. Container
I know about everything

18. HELLO WORLD
DEMO

19. MEFUNIT
DEMO

21. FROM 2.0 TO MEF
DEMO

22. BEYOND 3RD PARTY ADDINS
DEMO

24. In summary...
http://www.flickr.com/photos/m0php/530526644/

25. Summary
• Extensibility
• Allows 3rd parties to hook-in
• Allows internals to be decoupled
• Override your built in defaults
• Part of .Net 4.0 but built on 3.5
• Available today from Codeplex

26. Thank you!
Twitter - @Ben_Hall
Blog.BenHall.me.uk
Ben@BenHall.me.uk

27. Resources
• http://blog.BenHall.me.uk
• http://www.codeplex.com/mef
• http://blogs.msdn.com/gblock