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Crystal MEF
Software is Hard 
• Components
• Extensibility
– IDTExtensibility2
– ASP.NET Providers
– System.AddIn
Managed Extensibility Framework
• Released under .NET 4.0
– System.ComponentModel.Composition
• Open source
– http://mef.codeplex.com
• DEMOS
4(½) Key Concepts
• Parts
– A component that does something
• Export
– Parts that are available to be consumed
• Import
– Parts that a program consumes
• Composition
– The process by which Imports and Exports are
mated together
1. Parts
• A type annotated with MEF metadata
2. Export
• [Export] on a class exposes it as a Part
[Export]
public class Logger()
…
• [Export(type)] can expose a specific type e.g.
an interface
[Export(typeof(ILogger)
public class Logger :Ilogger
• [Export(string)] can expose a named
contract
3. Import
• [Import(type)] on a property makes it
consume a Part
public class SomeClass
[Import(typeof(Ilogger))
private Ilogger MyLogger()
• [ImportMany()] allows a part to import a
collection (IEnumerable<T>) of parts
4. Composition
• Parts are loaded through Catalogs
– TypeCatalog
• IEnumerable<types>
• [types]
– AssemblyCatalog
– DirectoryCatalog
– Your custom implementation of a catalog e.g.
DatabaseCatalog, DownloadCatalog
½. Recomposition
• Dynamic composition in response to a change
in the number of available Parts
MEF Help
• No book 
• http://tinyurl.com/stackoverflowmef
• Twitter
– @gblock
– @kathleendollard
– #MEF

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Crystal MEF

  • 2. Software is Hard  • Components • Extensibility – IDTExtensibility2 – ASP.NET Providers – System.AddIn
  • 3. Managed Extensibility Framework • Released under .NET 4.0 – System.ComponentModel.Composition • Open source – http://mef.codeplex.com • DEMOS
  • 4. 4(½) Key Concepts • Parts – A component that does something • Export – Parts that are available to be consumed • Import – Parts that a program consumes • Composition – The process by which Imports and Exports are mated together
  • 5. 1. Parts • A type annotated with MEF metadata
  • 6. 2. Export • [Export] on a class exposes it as a Part [Export] public class Logger() … • [Export(type)] can expose a specific type e.g. an interface [Export(typeof(ILogger) public class Logger :Ilogger • [Export(string)] can expose a named contract
  • 7. 3. Import • [Import(type)] on a property makes it consume a Part public class SomeClass [Import(typeof(Ilogger)) private Ilogger MyLogger() • [ImportMany()] allows a part to import a collection (IEnumerable<T>) of parts
  • 8. 4. Composition • Parts are loaded through Catalogs – TypeCatalog • IEnumerable<types> • [types] – AssemblyCatalog – DirectoryCatalog – Your custom implementation of a catalog e.g. DatabaseCatalog, DownloadCatalog
  • 9. ½. Recomposition • Dynamic composition in response to a change in the number of available Parts
  • 10. MEF Help • No book  • http://tinyurl.com/stackoverflowmef • Twitter – @gblock – @kathleendollard – #MEF