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    <p>You'll have to make sure that the update happens on the correct thread; the UI thread.</p> <p>In order to do this, you'll have to Invoke the event-handler instead of calling it directly.</p> <p>You can do this by raising your event like this:</p> <p>(The code is typed here out of my head, so I haven't checked for correct syntax, etc., but it should get you going.)</p> <pre><code>if( MyEvent != null ) { Delegate[] eventHandlers = MyEvent.GetInvocationList(); foreach( Delegate d in eventHandlers ) { // Check whether the target of the delegate implements // ISynchronizeInvoke (Winforms controls do), and see // if a context-switch is required. ISynchronizeInvoke target = d.Target as ISynchronizeInvoke; if( target != null &amp;&amp; target.InvokeRequired ) { target.Invoke (d, ... ); } else { d.DynamicInvoke ( ... ); } } } </code></pre> <p>Note that the code above will not work on WPF projects, since WPF controls do not implement the <code>ISynchronizeInvoke</code> interface.</p> <p>In order to make sure that the code above works with Windows Forms and WPF, and all other platforms, you can have a look at the <code>AsyncOperation</code>, <code>AsyncOperationManager</code> and <code>SynchronizationContext</code> classes.</p> <p>In order to easily raise events this way, I've created an extension method, which allows me to simplify raising an event by just calling:</p> <pre><code>MyEvent.Raise(this, EventArgs.Empty); </code></pre> <p>Of course, you can also make use of the BackGroundWorker class, which will abstract this matter for you.</p>
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    1. POHow do I update the GUI from another thread?
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    1. USFrederik Gheysels
    1. USFrederik Gheysels
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    1. COIndeed, but I don't like to 'clutter' my GUI code with this matter. My GUI shouldn't care whether it needs to Invoke or not. In other words: i don't think that it is the responsability of the GUI to perform the context-swithc.
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      1. USFrederik Gheysels
    2. COBreaking the delegate apart etc seems overkill - why not just: SynchronizationContext.Current.Send(delegate { MyEvent(...); }, null);
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      1. USMarc Gravell
    3. CODo you always have access to the SynchronizationContext ? Even if your class is in a class lib ?
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      1. USFrederik Gheysels
 

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