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I made a Matrix implementation which has an overloaded operator *. If there’re 2 matricies of incompatible sizes I’d like to throw either ArgumentException or InvalidOperationException. Which one should I use? Or maybe it’s move convenient to declare my own?
Definitely create your own
MismatchingDimensionsException.Your users won’t be confused by such an exception, they’ll know what the problem is right away. It’s the kind of problem that can happen a lot when dealing with matrices.
Now, do you derive it from ArgumentException or InvalidOperationException? I would say the former, but the latter makes just as much sense. If you use your own exception class, it matters less.