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Crystal MEF

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Phil Pursglove
Phil Pursglove

The document discusses the Managed Extensibility Framework (MEF), which allows applications to be extended through extensions called "parts." MEF allows parts to define what they export via attributes like [Export] and what they import via attributes like [Import]. It also describes how parts are composed together through catalogs that provide available parts to satisfy imports. The key concepts are parts, exports that make parts available, imports that parts require, and composition that matches imports and exports.

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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(遜) 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
遜. 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(遜) 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. 遜. 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