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Let’s assume I have two objects called K and M
if(K.Equals(M))
{
}
If that’s true, K and M always has the same HashCode ?
Or It depends on the programming language ?
The contract for
GetHashCode()requires it, but since anyone can make their own implementation it is never guaranteed.Many classes (especially hashtables) require it in order to behave correctly.
If you are implementing a class, you should always make sure that two equal objects have the same hashcode.
If you are implementing an utility method/class, you can assume that two equal objects have the same hashcode (if not, it is the other class, not yours, that is buggy).
If you are implementing something with security implications, you cannot assume it.