C# Pinvoke判断是UEFI模式还是BIOS模式

[DllImport("kernel32.dll", SetLastError = true)]

        public static extern UInt32 GetFirmwareEnvironmentVariableA([MarshalAs(UnmanagedType.LPWStr)] string lpName, [MarshalAs(UnmanagedType.LPWStr)] string lpGuid, IntPtr pBuffer, UInt32 nSize);

public static bool IsUefi()

        {

            //ERROR_INVALID_FUNCTION 1(0x1)

            //ERROR_NOACCESS 998(0x3E6)

             GetFirmwareEnvironmentVariableA("", "{00000000-0000-0000-0000-000000000000}", IntPtr.Zero, 0);

            if (Marshal.GetLastWin32Error() == 0x1)

            {

                return false;

            }

            else

            {

                return true;

            }

        }