CODEWITHSUNDEEP
c#.netvb.netclr
Max
Max

Reputation: 180

Why does IEqualityComparer<T> Equals method take two arguments?

I don't understand why does the Equals method take (T x, T y). Don't you already have one instance to compare to when you invoke the method on an instance? Same for GetHashCode - why does it need an object instance as a parameter if I'm already invoking it on an existing instance?

What would happen if I invoke a.GetHashCode(b)? Which one is used?

Upvotes: 0

Views: 133

Answers (1)

Peter Duniho
Peter Duniho

Reputation: 70671

The IEqualityComparer<T> interface is for a comparer object. So, no...you would not already have one instance as part of the implementation.

You may be thinking of IEquatable<T>, where it's implemented by the type of object being compared.

Upvotes: 5

Related Questions