public IList <Book> SearchByAuthor(string author)
{
if (SortedByAuthor.ContainsKey(author))
{
return(SortedByAuthor[author]);
}
throw new KeyNotFoundException($"Book from the following Author {author} was not found ");
}
public void AddBook(Book book)
{
SortedByTitle.TryAdd(book.Title, new List <Book>());
SortedByTitle[book.Title].Add(book);
SortedByAuthor.TryAdd(book.Author, new List <Book>());
SortedByAuthor[book.Author].Add(book);
SortedBySubject.TryAdd(book.Subject, new List <Book>());
SortedBySubject[book.Subject].Add(book);
SortedByPublishDate.TryAdd(book.PublishDate, new List <Book>());
SortedByPublishDate[book.PublishDate].Add(book);
}
