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And what do I do if I need other dependencies injected to do the task? I need it to start when the Application comes up, so that when it's injected the result will already be there...

You just inject them to this provide method

Though it looks that it would be better to encapsulate it to a class instead of trying to work with scopes and deferred on level of DI

Yeah, in the case where I'd need dependencies, you're probably right...