Question

Suppose I define an export in AssemblyA:

[Export(typeof(Foo))]
public class Foo
{
    ...
}

Is there a way to determine the export of Foo is from AssemblyA in the CompositionContainer?

What I am trying to do, is for any given assembly that provides MEF exports, it must also include one MEF export of a specific interface. And I want to be able to flag any assemblies that do not satisfy this rule.

Answer 1

There’s no way to do this from in a CompositionContainer. I would suggest creating an AssemblyCatalog for each assembly and checking whether any of its Parts have an ExportDefinition matching the interface you want.