I’m new to MEF. In Managed Exensibility Framework, what do you mean by events exportschanging and exportschanged. How one can visualize it?
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I’m new to MEF. In Managed Exensibility Framework, what do you mean by events exportschanging and exportschanged. How one can visualize it?
In the Managed Extensibility Framework, objects are wired together by matching imports with exports. I assume you already know about that. (If not, you should read through the MEF programming guide first and play with MEF a bit.)
In a typical scenario, exports are provided by a catalog of types. Some of these catalogs can be changed while the application is running, at which point the application might be recomposed.
Here are two examples of modifying a catalog:
DirectoryCatalog.Refresh()(this will rescan the directory and pick up new assemblies)AggregateCatalog.Catalogs.AddWhen this happens, the
CatalogExportProviderbased on the catalog will trigger theExportsChangingevent right before handling the change, andExportsChangedright after.Not all export providers have to be based on catalogs, but I hope you get the idea.