The last step performed by the control unit is equivalent to a jump to the interrupt or exception handler.

控制单元进行的最后一步等同于跳到中断或异常处理函数。

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By way of exception the test of the control-unit, the volume regulator can be adjusted.

例外的是控制元件测试。在此过程中仍可以操作音量调节器。

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Otherwise, the exception is caught by the class library (or worse, the host), and the user will be presented with a dialog box in the best case and a missing control in the worst case.

否则，异常将会被类库接收（或者更糟，被宿主机），最好的情况下用户仅看到一个对话框，最糟糕的情况下则显示缺失控件。

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