How do you call the GUI thread in Silverlight from the BackgroundWorker method?

I am using a BackgroundWorker thread to do some work outside of the GUI thread in Silverlight 4. I would like to update widgets in the GUI context from the background thread, but have read warnings about doing so from Microsoft documentation. I understand that communicating from one thread to another throws an exception as only the GUI thread can update widgets, but isn't BeginInvoke provided for this:

// BackgroundWorker thread code...

Widget.Dispatcher.BeginInvoke(() => Status.Text = "Hello");

However, I am getting some unpredictable results in my worker code.

What is the proper way to cross communicate with the GUI thread ? Is it by passing a results collection out of the开发者_如何学运维 RunWorkerCompleted method ?

Thanks,

Scott

You don't call the GUI code directly.

You must fire and event to which the UI thread subscribes. It then does the marshalling necessary to update the UI safely.

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