> ICollection<A> acoll; > ICollection<B> bcoll; > A[] cat; > ICollection<A>.CopyTo(A[],int) > ICollection<B>.CopyTo(B[],int) - note the signature, the destination array > can't be an array of supertype. There's no chance to throw an exception > because the code doesn't pass type check at compile time.
To ease understanding: ICollection<Animal> acoll; ICollection<Cat> ccoll; Animal[] animals; ICollection<Animal>.CopyTo(Animal[],int) ICollection<Cat>.CopyTo(Cat[],int)
