In Canada, in our Criminal Code,if you order someone to leave the inside of your home, and they refuse / do not? They have committed assault against you. This

In Canada, in our Criminal Code,if you order someone to leave the inside of your home, and they refuse / do not? They have committed assault against you. This serves two purposes. The first is, a crime has been committed. The second is, you may now defend yourself. I'm sure there is something similar in common law for other buildings. EG control of a space. (I know nothing of this incident, just speaking generically.)