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I'm building an MVC 3 application where MEF is used. The main idea is to have plug-in mechanism where models, controllers and views are loaded dynamically during runtime from mef container. Each plugin/module consists of two assemblies: Module1.Data.dll (contains definitions of models) Module1.Web.dll (contains controllers and views) and are put in the Plugins directory inside web application bin: WebApp/Bin/Plugins/Module1.Data.dll WebApp/Bin/Plugins/Module1.Web.dll WebApp/Bin/Plugins/Module2.Data.dll WebApp/Bin/Plugins/Module2.Web.dll WebApp/Bin/Plugins/ModuleCore.Data.dll WebApp/Bin/Plugins/ModuleCore.Web.dll etc... There is also core module that is referenced by all other modules: ModuleCore.Data.dll and respectively ModuleCore.Web.dll. Then, in Global.asax, container is build in the following way: AggregateCatalog catalog = new AggregateCatalog(); var binCatalog = new DirectoryCatalog(HttpRuntime.BinDirectory, "Module*.dll"); var pluginsCatalot = new DirectoryCatalog(Path.Combine(HttpRuntime.BinDirectory, "Plugins"), "Module*.dll"); catalog.Catalogs.Add(binCatalog); catalog.Catalogs.Add(pluginsCatalot); CompositionContainer container = new CompositionContainer(catalog); container.ComposeParts(this); AppDomain.CurrentDomain.AppendPrivatePath(Path.Combine(HttpRuntime.BinDirectory, "Plugins")); CustomViewEngine is created and registered and used for finding views in module assembly: ViewEngines.Engines.Clear(); ViewEngines.Engines.Add(new CustomViewEngine()); controller factory for loading controllers from container: ControllerBuilder.Current.SetControllerFactory(new MefControllerFactory(_container)); <p

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