private void AddISBN(NewBook obj)
{
if (obj != null && ISBNs.LastOrDefault() != obj)
{
return;
}
var isbn = new NewBook(_isbns);
isbn.PropertyChanged += (sender, args) =>
{
if (args.PropertyName != nameof(IsValid))
{
return;
}
OnPropertyChanged(nameof(IsValid));
};
ISBNs.Add(isbn);
}
public NewBookDialog()
{
InitializeComponent();
DataContext = new NewBook();
}