Autofac: How to use construction injection on class with dependency to another object function output?

As given, this class structure looks perfectly fine. You are properly using Constructor Injection and using the static structure of the classes to communicate invariants and relationships . On the level of information provided here, I think the only thing missing is a Guard Clause in the C constructor :).

Given your reply to the accepted answer, there might be another technique to use in Autofac. If the set of plugins is available during registration, you could register them as a collection.

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