Why do we need to define both == & !=

[Ethan Strauss]

I am just curious about this. I don't have any particular difficulty dealing with it.


When defining "==" for an object, you also need to define "!=". Why is this? Isn't "!=" always completely implied by "=="? (and for that matter by "Equals")? I have never defined != in any way other than

public static bool operator !=(object obj1, object obj2)
{
return !(obj1 == obj2);
}

And if there is some circumstance that you might want them to be different, wouldn't it make sense to have defining != be optional?

Thanks,

Ethan



Ethan Strauss

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