C# (CSharp) Library Books.Add примеры использования

Пример #1

 public SmallBook(Author author, string title, int pages)
 {
     Id       = NextId;
     Type     = "small";
     AuthorId = author.Id;
     Title    = title;
     Pages    = pages;
     Books.Add(this);
     NextId++;
 }

Пример #2

 public MediumBook(Author author, string title, int pages)
 {
     Id       = NextId;
     Type     = "medium";
     AuthorId = author.Id;
     Title    = title;
     Pages    = pages;
     Books.Add(this);
     NextId++;
 }