public Book(string bookName, DateTime publicationDate, BookCategory category, IList <Author> authors, string description = null)
{
ValidateInput(bookName, publicationDate, category, description, authors);
foreach (var author in authors)
{
var authorToBook = new AuthorToBook(this, author);
Authors.Add(authorToBook);
}
Category = category;
Name = bookName;
PublicationDate = publicationDate;
}
private void ValidateInput(string bookName, DateTime publicationDate, BookCategory category, string description, IList <Author> authors = null)
{
if (string.IsNullOrWhiteSpace(bookName))
{
throw new ArgumentNullException($"Next field named: {nameof(bookName)} is null or empty");
}
if (publicationDate == null)
{
throw new ArgumentNullException($"{nameof(publicationDate)} is requared");
}
if (authors == null)
{
throw new ArgumentNullException($"{nameof(authors)} is requared");
}
if (category == null)
{
throw new ArgumentNullException($"{nameof(category)} is requared");
}
Description = description ?? "Without description";
}