Modify List.Contains behavior

Question

I have a List with the class MyObj : IComparable. I wrote the method CompareTo in the MyObj class per the

Answer 1

According to the documentation for List<T>.Contains, it uses either your implementation of IEquatable interface or object.Equals, that you can override as well.

Answer 2

Did you try overriding the Equals method?

List<T>, according to reflector, uses EqualityComparer<T> to check for containment, and the default implementation (ObjectEqualityComparer) uses Equals for most normal objects.

Answer 3

The absolute easiest way to find out whether your CompareTo method is called is to set a breakpoint in it and hit F5 to run your program. But I believe that List<T>.Contains looks for the IEquatable<T> interface for making the comparison.