Question

Suppose that I have a registration screen, and when the user clicks the “Register” button an asynchronous operation takes place, at the end of which a delegate method is invoked. I want the button to be turned off when the user clicks it (that part is easy), and for the button to be re-enabled if the registration fails (server declined the registration). How do I access this button’s properties from the delegate function?

Answer 1

Assuming you’ve declared the Button’s name in XAML, in the delegate callback function, I’d do something like (The Dispatcher.BeginInvoke is necessary to execute the code on the UI thread):

Dispatcher.BeginInvoke(() =>
{
       MyRegisterButton.IsEnabled = true;
});