- Check MVC services once at startup
- Make action selector sync
We've never really had a scenario for the action selector being async, it
just ended up that way. None of our extensibility here lets you do
anything async without replacing it wholesale, which we don't
recommend.
This change fixes call sites on the main request path for a simple site
(model binding, validation, views) that allocate boxed list enumerators.
Some cases aren't addressed by this change because the fix is too invasive
or requires changing an important contract to take IList instead of
IEnumerable. Will follow up on those case by case in order of importance.
Abstractions - Core MVC extensibility
Controllers - MVC implementations of .Abstractions and supporting
contracts
Infrastructure - General purpose support APIs. Metadata APIs that don't
fit clearly with a feature or with .Abstraction