如何捕获调试时不会发生的异常？

I have some image processing code that runs on a background thread and updates an Image control on the UI thread when it's done processing using Dispatcher.BeginInvoke(). When I'm running my application outside of the debugger, it crashes quite often. As soon as I run it in the debugger, I can't get it to happen at all. Apparently the timing difference is enough to make my life miserable right now ;-)I have some image processing code that runs on