Should I return an array or a collection from a function?

Question

What's the preferred container type when returning multiple objects of the same type from a function?

Is it against good practice to return a simple array (like MyType[]), or should you wrap it in some generic container (like ICollection<MyType>)?

Thanks!

Answer 1

Eric Lippert has a good article on this. In case you can't be bothered to read the entire article, the answer is: return the interface.

Answer 2

Return an IEnumerable<T> using a yield return.