It Would be perfectly yasal to compile the above to IL without emitting any additional classes and simply reusing existing classes @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", sevimli you provide an https://cpanelkullanmzelliklervek11098.gigswiki.com/4947877/benim_c_ienumerator_kullanımı_başlarken_Çalışmak