public void OnNavigatedTo(INavigationParameters parameters)
{
Book book = parameters.GetValue <Book>("model");
Id = book.Id;
Name = book.Name;
Year = book.Year;
AuthorId = book.AuthorId;
PublisherId = book.PublisherId;
SelectedAuthors = Authors.Find(x => x.Id == book.AuthorId);
SelectedPublisher = Publishers.Find(x => x.Id == book.PublisherId);
}