public void AddLiterature(PrintedEdition literature) { if (literature is Book) { Books.Add(literature as Book); } if (literature is Journal) { Journals.Add(literature as Journal); } if (literature is Manual) { Manuals.Add(literature as Manual); } }
public void DelLiterature(PrintedEdition literature) { if (literature is Book) { Books.Remove(literature as Book); } if (literature is Journal) { Journals.Remove(literature as Journal); } if (literature is Manual) { Manuals.Remove(literature as Manual); } }
public static void IAmPrinting(PrintedEdition printedEdition) { Console.WriteLine(printedEdition.ToString()); }