“算术运算中的溢出或欠流”WPF特定问题

My WPF test app (very simple, just one window) is using a 3rd party managed dll (say X.dll). This managed dll uses some unmanaged dll's . So lets say I write a small wpf app which just references X.dll. And in the window's constructor I access something inside X.dll (ie. in some namespace in X.dll). On doing this i dont catch any exception and it seems like things are going on as expected. But upon returning the control to .NET runtime, I get an exception in Application class's 'DispatcherUnhandledException' handler :My WPF test app (very simple, just one window)