How do I load related entities of type IEnumerable

Question

I\'m trying to load related entities of a SingleOrDefault entity, but I am getting the following exception:

The navigation property of type IEnumerable is not a sing

Answer 1

IEnumerable<T> is not supported as a type for a navigation collection. You must use ICollection<T> or another interface derived from it (for example IList<T>) or a concrete implementation of ICollection<T> - like List<T>, HashSet<T>, etc.

Answer 2

That's because you need ICollection instead of IEnumerable.