public static class Win32Api
{
    public const int CM_LOCATE_DEVNODE_NORMAL = 0x00000000;
    public const int CM_REENUMERATE_NORMAL = 0x00000000;
    public const int CR_SUCCESS = 0x00000000;

    [DllImport("CfgMgr32.dll", SetLastError=true)]
    public static extern int CM_Locate_DevNodeA(ref int pdnDevInst, string pDeviceID, int ulFlags);

    [DllImport("CfgMgr32.dll", SetLastError=true)]
    public static extern int CM_Reenumerate_DevNode(int dnDevInst, int ulFlags);
}

　　

调用方法：

int pdnDevInst = 0;
Win32Api.CM_Locate_DevNodeA(ref pdnDevInst, null, Win32Api.CM_LOCATE_DEVNODE_NORMAL);
Win32Api.CM_Reenumerate_DevNode(pdnDevInst, Win32Api.CM_REENUMERATE_NORMAL);

 

 

参考链接：

https://*.com/questions/2181525/is-there-an-api-call-to-start-a-scan-for-hardware-devices