解决方法
UnhandledException event page解释了为什么你的例外没有被处理(强调我的)：
This event is only used with exceptions encountered by the XAML
framework. Exceptions encountered by other Windows Runtime components
or parts of the application that are not connected to the XAML
framework will not result in this event being raised.
它继续解释你应该在最特定的时间捕获异常.据我所知,Windows 8风格的应用程序中没有全局事件处理程序.
