OemMinus    The OEM minus key on any country/region keyboard (Windows 2000 or later). 
Oemplus     The OEM plus key on any country/region keyboard (Windows 2000 or later).@H_403_9@ 
 
你可以有这样的东西：
 
  
 
if (keyData == (Keys.Control | Keys.OemMinus) ) ZoomOutOrSomething();//@H_403_9@