Why generic IList<> does not inherit non-generic IList

Question

IList does not inherit IList where IEnumerable inherits IEnumerable.

If out mo

Answer 1

Note that since 2012, in .NET 4.5 and later, there exists a covariant (out modifier) interface,

public interface IReadOnlyList

see its documentation.

Usual collection types like List, Collection and YourClass[] do implement IReadOnlyList and because of the covariance can also be used as IReadOnlyList and ultimately IReadOnlyList