Best way to convert IList or IEnumerable to Array

IEnumerable query = ...;
MyEntityType[] array = query.Cast<MyEntityType>().ToArray();

public static void T[] PerformQuery<T>()
{
    IEnumerable query = ...;
    T[] array = query.Cast<T>().ToArray();
    return array;
}

using System.Linq;

IEnumerable<object> query = ...;
object[] bob = query.ToArray();