用c#怎么获取显卡类型，是独立显卡还是集成显卡

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用c#怎么获取显卡类型，是独立显卡还是集成显卡

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public string GetVideoPNPID() { string st = ""; ManagementObjectSearcher mos = new ManagementObjectSearcher("Select * from Win32_VideoController"); foreach (ManagementObject mo in mos.Get()) { st = mo["PNPDeviceID"].ToString(); } return st; }