public void AddBook(Books book) { var index = _item.FindIndex(item => item.Id == book.Id); if (index >= 0) { _item[index].Amount++; } else { book.Amount = 1; _item.Add(book); } }
public BookStoreLibrary() { Potter1 = new Books { Id = 1, BookName = "哈利波特第一集", Price = 100, Amount = 0 }; Potter2 = new Books { Id = 2, BookName = "哈利波特第二集", Price = 100, Amount = 0 }; Potter3 = new Books { Id = 3, BookName = "哈利波特第三集", Price = 100, Amount = 0 }; Potter4 = new Books { Id = 4, BookName = "哈利波特第四集", Price = 100, Amount = 0 }; Potter5 = new Books { Id = 5, BookName = "哈利波特第五集", Price = 100, Amount = 0 }; }