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thread requesting invalidate on ui thread c#

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Last Modified: 2015-07-23
hi experts,
I have a thread that is moving objects around in a canvas by changing their coordinates when events happen.  normally if I was doing all this on the ui thread, there's no problem to call invalidate whenever I want to redraw.  but of course this blows up from the thread if invalidate is called from it.

could someone show me a little snippet that would show how to use the synchronization context to call invalidate from my thread?  this worker was started with task.factory.startnew(MoveObjectsAround)

Thanks!
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