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copied!<p>+1 to Nenad and Bastiaan for pointing me in the <code>Control.Invoke</code> direction.</p> <p>In order to fully reap the benefits of the «passive view» pattern, I don't want any knowledge of the <code>Control</code> type of WinForms in the «<a href="http://martinfowler.com/eaaDev/SupervisingPresenter.html" rel="nofollow noreferrer">supervising controller</a>» (that type should only be known by the implementer of the view interface, i.e. the one derived from <code>Form</code>).</p> <p>Here's how I solved the issue satisfactory:</p> <ul> <li>The controller creates a new <code>Thread</code> instance with the <code>ForEach</code> loop a an argument, and then starts the created instance.</li> </ul> <p>Before:</p> <pre><code>View.DateSpan.Workdays.ForEach(d => { // do stuff... } ); </code></pre> <p>After:</p> <pre><code>new Thread( () => View.DateSpan.Workdays.ForEach( d => { // do stuff... } ) ).Start(); </code></pre> <ul> <li>The view's widget update methods use a helper method that checks if the request comes from another thread, and if so uses <code>Invoke</code>. See the code below.</li> </ul> <p>Before: </p> <pre><code>public string Status { set { _statusLabel.Text = value ); } } </code></pre> <p>After:</p> <pre><code>public string Status { set { ExecuteOnUIThread( _statusLabel, () => _statusLabel.Text = value ); } } </code></pre> <p>The helper method:</p> <pre><code>private static void ExecuteOnUIThread( Control control, Action action ) { if ( control.InvokeRequired ) { control.Invoke( action ); } else { action(); } } </code></pre> <p>The production WinForm view works like a charm, and with the addition of a while loop that spins the thread while the background thread does its work in my BDD stories, so do they with my old view «<a href="http://xunitpatterns.com/Test%20Spy.html" rel="nofollow noreferrer">test spy</a>».</p>

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