Set DocumentViewer.Document from another thread?

Question

I have a class with a method (CreateDocument) that fires an event at the end. The event args contain a FixedDocument. In my MainWindow code I try to set a DocumentViewer's Document like:

void lpage_DocCreated(object sender, LabelDocumentEventArgs e) { this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new DispatcherOperationCallback(delegate { FixedDocument fd = e.doc; documentViewer1.Document = fd; documentViewer1.FitToWidth(); return null; }), null); }

I receive "The calling thread cannot access this object because a different thread owns it." on line documentViewer1.Document = fd;

I am able to update a progress bar in another event handler that the same method fires while it is working:

 Int32 progress = Int32.Parse(sender.ToString()); progBar.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, new DispatcherOperationCallback(delegate { progBar.Value = progress; return null; }), null);

I can't figure out why I can't set the document when I'm essentially doing the same type of thing when I set the progress bar value.

CodeNaked · Accepted Answer · 2011-06-21 15:03:41Z

The FixedDocument element also has thread-affinity. So if you are creating it in a separate thread than the documentViewer1, then you would get that exception.

Basically, anything that derives from DispatcherObject has a thread-affinity. FixedDocument derives from DispatcherObject, just like the viewer controls.

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