IComparable and Equals()

Question

From MSDN

Types that implement IComparable must override Equals.Types that override Equals must also override GetHashCode; otherwise, Hashtable migh

Answer 1

IComparable is used for comparing two objects - if these are considered equal then Compare will return 0. It would be very unexpected if IComparable.Compare returned zero for two objects, yet obj1.Equals(obj2) returned false since this would imply two different meanings of equality for the objects.

When a class overrides Equals, it should also override GetHashCode since two equal objects should hash to the same value, and this hash should be based on the fields/properties used in the implementation of equality.