Container hierarchy in MEF from Microsoft.Composition

Question

In MEF, from the System.ComponentModel.Composition assembly, it is possible to create a hierarchy of containers and use parent exports for child containers.

 // родительский контейнер var parentContainer = new CompositionContainer(new TypeCatalog(typeof(ParentService))); // дочерний контейнер var childContainer = new CompositionContainer(new TypeCatalog(typeof(Service)), parentContainer); // использование дочерних и родительских экспортов через дочерний контейнер childContainer.GetExportedValue<IService>().DoWork(); childContainer.GetExportedValue<IParentService>().DoParentWork();

I am using MEF 2 from the Microsoft.Composition NuGet package. There was a need to create a hierarchy of containers. Is there the same opportunity here? I do the following:

 var parentContainer = new ContainerConfiguration() .WithPart<ParentService>() .CreateContainer(); // Как передать сюда родительский контейнер? var childContainer = new ContainerConfiguration() .WithPart<Service>() .CreateContainer(); childContainer.GetExport<IService>().DoWork(); childContainer.GetExport<IParentService>().DoParentWork(); // Исключение. Экспорт не найден

Vlad Vlad 2,769 1 golden mark 10 silver marks 28 bronze marks · Accepted Answer · 2016-11-14T08:25:52

As it turned out, MEF 2 does not support container hierarchy. Codeplex Documentation :

There is no catalog concept, nor any “container hierarchy” or composition scoping APIs.

Container hierarchy in MEF from Microsoft.Composition

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