Autofac: Resolving variant types with both in and out type arguments?

I think this is a limitation we're unlikely to overcome in Autofac, but it is interesting to explore.

You're correct in observing that the ContravariantRegistrationSource only recognizes types with one generic parameter. Looking at the source (currently at approx. Line 166) you'll see that limitation right there.

Looking at how the registration source is required to provide possible candidates I can understand that lifting the limitation will require more complexity in the implementation.

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