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copied!<p>IMO answers stating that you should launch a thread to handle this are misguided. What you need is to jump the window back to the main dispatcher thread.</p> <h3>In WPF</h3> <pre><code>public ShellViewModel( [NotNull] IWindowManager windows, [NotNull] IWindsorContainer container) { if (windows == null) throw new ArgumentNullException("windows"); if (container == null) throw new ArgumentNullException("container"); _windows = windows; _container = container; UIDispatcher = Dispatcher.CurrentDispatcher; // not for WinForms } public Dispatcher UIDispatcher { get; private set; } </code></pre> <p>and then, when some event occurs on another thread (thread pool thread in this case):</p> <pre><code>public void Consume(ImageFound message) { var model = _container.Resolve<ChoiceViewModel>(); model.ForImage(message); UIDispatcher.BeginInvoke(new Action(() => _windows.ShowWindow(model))); } </code></pre> <h3>WinForms equivalent</h3> <p>Don't set UIDispatcher to anything, then you can do have:</p> <pre><code>public void Consume(ImageFound message) { var model = _container.Resolve<ChoiceViewModel>(); model.ForImage(message); this.Invoke( () => _windows.ShowWindow(model) ); } </code></pre> <h3>DRYing it up for WPF:</h3> <p>Man, so much code...</p> <pre><code>public interface ThreadedViewModel : IConsumer { /// <summary> /// Gets the UI-thread dispatcher /// </summary> Dispatcher UIDispatcher { get; } } public static class ThreadedViewModelEx { public static void BeginInvoke([NotNull] this ThreadedViewModel viewModel, [NotNull] Action action) { if (viewModel == null) throw new ArgumentNullException("viewModel"); if (action == null) throw new ArgumentNullException("action"); if (viewModel.UIDispatcher.CheckAccess()) action(); else viewModel.UIDispatcher.BeginInvoke(action); } } </code></pre> <p>and in the view model:</p> <pre><code> public void Consume(ImageFound message) { var model = _container.Resolve<ChoiceViewModel>(); model.ForImage(message); this.BeginInvoke(() => _windows.ShowWindow(model)); } </code></pre> <p>Hope it helps.</p>

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