Dependency Injection with MEF and Unity Pavel Yosifovich Hi-Tech College pavely@hi-tech.co.il http://blogs.microsoft.co.il/blogs/pavely

Agenda Why MEF? MEF Features Why Unity? Unity Features Q & A Summary

MEF Basics DEMO

MEF Basics Parts Catalog Container Export and Import A list of parts The matchmaker Composition MEF Part Export Import MEF Part Export Import

MEF Basics - Catalogs AggregateCatalog DirectoryCatalog AssemblyCatalog TypeCatalog

MEF Features DEMO

More MEF Features [ImportingConstructor] [ImportMany] Creation Policy AllowDefault=true Re-composition Metadata

MEF - Summary MEF is about extensibility through composition Dependency Injection capabilities Not a true IoC container Part of .NET 4 MEF for Silverlight 4 Mostly similar, some Silverlight specific features( e.g. DeploymentCatalog)

Basic Unity DEMO

Unity Basics A true IoC container Registering types Resolving and injecting dependencies Configuration

More Unity Features DEMO

More Unity Features Lifetime management Hierarchical containers Aspect Oriented Programming (AOP) Interception

Questions?

Summary MEF is an extensibility framework Unity is an IoC container Exports & Imports Metadata and Re-composition Unity is an IoC container Type resolution Interception (AOP) Both provide Dependency Injection

Resources MEF on CodePlex Unity on CodePlex http://mef.codeplex.com/ Unity on CodePlex http://unity.codeplex.com/ Microsoft Patterns & Practices http://msdn.microsoft.com/en-us/practices/

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