public void RemoveEntry(BookStorage.Book book, Person person)
 {
     if (_libraryInfo.ContainsKey(person))
     {
         var entry = _libraryInfo.Where(i => i.Key == person && i.Value.Contains(book)).ToArray()[0];
         _libraryInfo.Remove(entry.Key);
     }
 }
 public void AddEntry(BookStorage.Book book, Person person)
 {
     if (_libraryInfo.ContainsKey(person))
     {
         var books = _libraryInfo.Where(i => i.Key == person).Distinct().Select(i => i.Value).ToArray()[0];
         books.Add(book);
     }
     else
     {
         _libraryInfo.Add(person, new List <BookStorage.Book> {
             book
         });
     }
 }