Dictionary with integer array as a key

Question

I need a Dictionary whose key is an array of integers for example Dictionary or

Dictionary,string>.
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Answer 1

It isn't predefined because it is expensive. If you know your list is short then just implement the obvious overrides. If not, you'll have to come up with some kind of heuristic for at least GetHashCode. Say, GetHashCode of only the first couple of elements xor-ed together with the Length.