ImmutableHashSet<T>.ICollection<T>.CopyTo Method (T, Int32)
Copies the elements of the set to an array, starting at a particular index.
Assembly: System.Collections.Immutable (in System.Collections.Immutable.dll)
The one-dimensional array that is the destination of the elements copied from the set. The array must have zero-based indexing.
The zero-based index in array at which copying begins.