你好 AndyLiu，
我看了下例子：https://code.msdn.microsoft.com/windowsapps/Projection-sample-526b3c1d/
这个例子可以把某一个自定义的页面投影到外接投影设备上，这样我们是否可以通过获取那个页面的长宽来判断投影屏幕的大小？
--James
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Thanks
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