MSDN原文如下：
When you debug a JavaScript solution that has a component DLL, you can set the debugger to enable either stepping through script, or stepping through native code in the component, but not both at the same time. To change the setting, select the JavaScript project node inSolution Explorer and then choose Properties, Debugging, Debugger Type.
大概的意思：你不能同时调试Metro Project和native code，可以通过选择Metro Project的项目【属性】->【调试】 ->底部的【调试类型】选择Native Only即可。