象WinForm编程一样，Silverlight中的UI对象，只能通过UI线程来更新。不同的是Silverlight提供了一个dispatcher对象，可以方便的将background线程对UI对象的操作marshal到UI线程上。而且，可以使用任意UI对象上的dispatcher来更新任意UI对象:
because Silverlight has a single UI thread,it has a single dispatcher object that holds a queue of work items for the UI. Using the dispatcher will allow you to update the UI from a non-UI thread.
from - http://msdn.microsoft.com/en-us/magazine/cc721609.aspx
You don't have to use the dispatcher property of the object you intend to update; you can use dispatcher on any UI object to marshal the call to the UI thread.
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