Get the current user, within an ApiController action, without passing the userID as a parameter

Question

How do we get the current user, within an secure ApiController action, without passing the userName or userId as a parameter?

We assume that this is available, beca

Answer 1

You can also access the principal using the User property on ApiController.

So the following two statements are basically the same:

string id;
id = User.Identity.GetUserId();
id = RequestContext.Principal.Identity.GetUserId();