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Cairo Code Camp 2010
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Speaker
• TA at Faculty of Information and Computer Science Ain Shams University
• Senior Software Engineer at ITWorx
• MCSD, MCPD + more.
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What's MEF?
• The Managed Extensibility Framework– “The Managed Extensibility Framework (MEF)
is a new library in .NET 4 / Silverlight 4 for building applications that can be incrementally extended” – mef team
– “An extensible framework for composing applications from a set of loosely-couple parts discovered and evolving at run-time” – mtaulty
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Why was MEF built?
App
Add B
Put the D
Can I have C
I need A
Then get me E
F
G
A
C
B
GD
EF
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Why MEF
• For customers• For you and your team • Always there, always ready
– In the framework!
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MEF Basics…
An Application is built of parts
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DemoBuilding our thing
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3 Magic steps
• Export it
• Import it
• Compose it
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Export it
[Export(typeof(IThing))]public class Thing{}
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ExportIThing
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Import it
public class MainPage{ [Import(typeof(IThing))] public IThing thing;}
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IThing
Import
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Compose it
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public class MainPage{public MainPage(){
CompositionInitializer.SatisfyImports(this);}
Compose
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DemoGiving more
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Import it - Metadata
ImportMany
[ImportMany]public IEnumerable<Lazy<IThing,
IThingMetadata>> somethings;
IThing
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Export it - Metadata
Put me in the
left
Export
[ExportMetadata("Position", ThingPosition.Left)][Export(typeof(IThing))]public partial class Thing{}
IThing
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Customize it – Custom exports
[ThingExport(Position = ThingPosition.Left)] public class Thing{}
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Put me in the
left
ExportIThing
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DemoExploring the catalogs
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AggregateCatalog
AssemblyCatalog
TypeCatalog
Compose it – Catalogs
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DemoTrim your apps break up your xaps
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Recomopose - DeploymentCatalog
• Recomposition is key in Silverlight apps– Initial download, small in size.– Download more functionality.
• A special Silverlight catalog DeploymentCatalog.
• Trace changes with IPartImportsSatisfiedNotification
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MEF versions
• .NET Framework shipping with Silverlight4• .NET Framework 4 shipping with VS 2010• Silverlight 3 & .NET Framework V3.5 SP1
– Source on Codeplex (MSPL)
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Resources
• silverlight.net• mef.codeplex.com• mefcontrib.codeplex.com• blogs.msdn.com/gblock• mtaulty.com – He is awesome!
– channel9.msdn.com/tags/learnMEFSL4
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Questions?
