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Use the Dispatcher.CheckAccess() method. Note; it doesn't appear in intellisense. e.g. if(!Dispatcher.CheckAccess()) {        // Invoke. } else {        // Normal code }

This shows an example of adding a custom WPF event to a control, called ImagingControl. public delegate void CameraConnectedEventHandler(object sender, CameraConnectedRoutedEventArgs e); public static readonly RoutedEvent CameraConnectedEvent = System.Windows.EventManager.RegisterRoutedEvent( "CameraConnected", RoutingStrategy.Bubble, typeof(CameraConnectedEventHandler), typeof(ImagingControl)); public event CameraConnectedEventHandler CameraConnected { add { this.AddHandler(CameraConnectedEvent, value); } remove { this.RemoveHandler(CameraConnectedEvent, value); } } public class CameraConnectedRoutedEventArgs : RoutedEventArgs { public CameraConnectedRoutedEventArgs(RoutedEvent routedEvent, bool bIsConnected) { RoutedEvent = routedEvent; IsConnected = bIsConnected; } public bool IsConnected { get; set; } } The event is raised in this lin...