public Book(string bookName, string authorFirstName, string authorLastName)
{
if (string.IsNullOrEmpty(bookName))
{
throw new SoftlyMiCakeException("书名不能为空");
}
Id = Guid.NewGuid();
BookName = bookName;
Author = new BookAuthor(authorFirstName, authorLastName);
}
public void ChangeAuthor(string firstName, string lastName)
{
Author = new BookAuthor(firstName, lastName);
}