问C#调用无效文件句柄

EN

    class Program
    {
    const uint GENERIC_READ = 0x80000000;
    const uint FILE_SHARE_READ = 0x00000001;
    const uint OPEN_EXISTING = 0x00000003;
    const uint FILE_FLAG_DELETE_ON_CLOSE = 0x04000000;

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern SafeFileHandle CreateFile(string Disk, uint Access, uint ShareMode, IntPtr SecurityAttributes, uint CreationDisposition, uint Flags, IntPtr TemplateFile);
    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern uint SetFilePointer([In] SafeFileHandle Handle, [In] int DistanceToMove, [Out] out int DistanceToMoveHigh, [In] int MoveMethod);
    [DllImport("kernel32.dll", SetLastError = true)]
    unsafe public static extern int ReadFile(SafeFileHandle Handle, [Out] byte[] Buffer, int NumberOfBytesToRead, out int NumberOfBytesRead, IntPtr Overlapped);



    unsafe public static void Main(string[] args)
    {
        string Drive = @"\\.\C";
        int SectorSize = 512;
        int Sector = 0;
        int BytesRead, DistanceToMoveHigh;
        byte[] Buffer = new byte[SectorSize];

        SafeFileHandle Handle = CreateFile(Drive, GENERIC_READ, FILE_SHARE_READ, IntPtr.Zero, OPEN_EXISTING, FILE_FLAG_DELETE_ON_CLOSE, IntPtr.Zero);
        SetFilePointer(Handle, Sector * SectorSize, out DistanceToMoveHigh, 0);
        ReadFile(Handle, Buffer, SectorSize, out BytesRead, IntPtr.Zero);

        Console.WriteLine(Marshal.GetLastWin32Error()); // It gives 6 which translates to an INVALID_FILE_HANDLE error
        Console.ReadKey();
    }
}