public static void AddBook(Book book)
{
using (var context = new DbContext()) {
context.Books.Add(book);
context.SaveChanges();
}
BookAddedOrDeleted?.Invoke(EventArgs.Empty);
}
public static void DeleteBook(string catalogueNumber)
{
using (var context = new DbContext()) {
var book = context.Books.Find(catalogueNumber);
if (book == null)
{
throw new NullReferenceException("Nie znaleziono ksiazki w bazie danych");
}
context.Books.Remove(book);
context.SaveChanges();
}
BookAddedOrDeleted?.Invoke(EventArgs.Empty);
}