Generics with inheritance and interfaces - why doesn't this work?

As Sasha says, you're looking for generic covariance . This may or may not be appropriate depending on what your interface members look like. If you only ever take values "out" of the interface, you can make your code compile by making T covariant.

No, it doesn't work that way with generics. A may be a subclass of B, but G is not a subclass of G. The same goes for interfaces.

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