When MEF meets Silverlight
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When MEF meets Silverlight
- 1. When MEF meets Silverlight AmrElsehemy amr.elsehemy@me.com 1
- 2. Speaker TA at Faculty of Information and Computer Science Ain Shams University Senior Software Engineer at ITWorx MCSD, MCPD + more. 2
- 3. 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 3
- 4. WhywasMEF built? 4 I need A Put the D Can I have C F E F B A App C G D Add B G Then get me E
- 5. Why MEF For customers For you and your team Always there, always ready In the framework! 5
- 6. MEF Basics… 6 An Application is built of parts
- 7. Demo Building our thing 7
- 8. 3 Magic steps Export it Import it Compose it 8
- 9. Export it 9 [Export(typeof(IThing))] publicclassThing { } IThing Export 9
- 10. Import it 10 publicclassMainPage { [Import(typeof(IThing))] publicIThing thing; } IThing Import 10
- 11. Compose it 11 publicclassMainPage { publicMainPage() { CompositionInitializer.SatisfyImports(this); } Compose 11
- 12. Demo Giving more 12
- 13. Import it - Metadata 13 [ImportMany] publicIEnumerable<Lazy<IThing, IThingMetadata>> somethings; IThing ImportMany
- 14. Export it - Metadata 14 [ExportMetadata("Position", ThingPosition.Left)] [Export(typeof(IThing))] publicpartialclassThing { } Put me in the left IThing Export
- 15. Customize it – Custom exports 15 [ThingExport(Position = ThingPosition.Left)] publicclassThing {} Put me in the left IThing Export 15
- 16. Demo Exploring the catalogs 16
- 17. TypeCatalog AssemblyCatalog AggregateCatalog Compose it – Catalogs 17
- 18. Demo Trim your apps break up your xaps 18
- 19. 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 19
- 20. MEF here, there, everywhere Samples 20
- 21. 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) 21
- 22. Resources silverlight.net mef.codeplex.com mefcontrib.codeplex.com blogs.msdn.com/gblock mtaulty.com – He is awesome! channel9.msdn.com/tags/learnMEFSL4 22
- 23. Questions? 23
Notas del editor
- Senior Software at ITWorxTeaching Assistant and pursing Masters at FCISHaving around 17 MS certsHave a blog at
- 1- Create the app (SL4)2- Create the UI3- Import a Widget4- Export a Widget5- Compose the container.
- 1- Add a second widget2- Introduce ImportingMany3- Show Lazy4- ExportMetadata5- Custom exports
- - Say about the choices (Import/Export combination)- How MEF decides to match Export:ContractNameSharedMetadataContractNameCardinalitySharedRecomposableMetadata
- Container , that has some catalogs which are places where MEF asks how to find matchesAdd an assembly catalog, built in catalog
- 1- Refactor Things.Extensions2- Make the Allow Recomposible
- Not just support features extensibilty, but also as a silverlight application everytimexaps are downloaded you try to cut off download size