How do I override the equals operator == for an Interface in C#?

Question

I have defined the following interface

public interface IHaveAProblem
{
    string Issue { get; set; }
}

And here is the implementation of

Answer 1

Have you tried implementing IComparable?

Like this:

public interface IHaveAProblem : IComparable
{
    string Issue { get; set; }
}

And then in the implementation of the class:

public class SomeProblem : IHaveAProblem
{
    public string Issue { get; set; }

    ...

    public int CompareTo(object obj)
    {
        return Issue.CompareTo(((SomeProblem)obj).Issue);
    }
}

Note that, this works only when you compare two instances of SomeProblem, but not any other implementations of the IHaveAProblem interface.

Not sure if there could occur a NullReferenceException.