The calling thread cannot access this object because a different thread owns it

Question

namespace PizzaSoftware.UI
{
    /// 

    /// Interaction logic for LoginForm.xaml
    /// 
    public partial class LoginForm : Windo         


        

Answer 1

Well, the simplest approach is to use a DispatcherTimer - which will fire its Tick event in the dispatcher thread:

DispatcherTimer timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromMilliseconds(1000);
timer.IsEnabled = true;
timer.Tick += timer_Elapsed;

Alternatively, you can use Dispatcher.Invoke/BeginInvoke to execute a delegate in the dispatcher thread... but that will be more complicated. This would be a better approach if you needed to do significant work on each timer tick and then just update the UI with the result - but as you're not doing much work at all here, it's fine to just do it all in the UI thread.

Answer 2

Didn't realize this was a WPF app. You need to get a hold of the Dispatcher, which you can do in the Constructor:

    private Dispatcher _dispathcer;

    public LoginForm()
    {
        InitializeComponent();
        _dispathcer = Dispathcer.CurrentDispather;
    }



    void timer_Elapsed(object sender, ElapsedEventArgs e)
    {
        _dispathcer.Invoke(new Action( ()=> { lblCurrentTime.Content = DateTime.Now.ToShortTimeString();});
    }