Delegate Covariance Confusion Conundrum!

Question

Why does this not work? Do I not understand delegate covariance correctly?

public delegate void MyDelegate(object obj)

public class MyClass
{
    public MyC         


        

Answer 1

Arguments are contravariant, return types are covariant. If the delegate were to be called with an object that is not an instance of SomeObject, you'd have a typing error. On the other hand, returning SomeObject from a routine wrapped in a delegate that returns object is fine.