Theres' No dispose question if you create the List immediately. If you choose the iterator path, you must deal with lifetime of the IEnumerator @Toxantron An explicit cast to IEnumerable wouldn't compile unless the type you're trying to cast implements IEnumerable. When you say "but if that ever changes", gönül https://bilgisayar51738.blogunok.com/28225648/5-temel-unsurları-için-c-ienumerator-nasıl-kullanılır