c# - Dictionary TryGetValue without using value returned -

i'm implementing simple dictionary<string, int> keeps track of picture files download, , renaming of files.

string - original filename

int - new filename

i read on trygetvalue vs containskey , came across this:

trygetvalue approach faster containskey approach when want check key in collection , want value associated it. if want check key present or not use containskey only.

from here

as such, wondering other people's views on following:

should use trygetvalue if not plan use returned value, assuming dictonary size grow 1000 entries, , duplicate checks everytime download ie. frequently?

in theory, follow documentation. if don't want value use containskey because there's no code go , grab value out of memory.

now, in practice, doesn't matter because you're micro-optimizing on dictionary that's small in grand scheme of things. so, in practice, best , readability of code.

and idea, would grow 1000 entries really small isn't going matter in practice.