// Use interop to call the CreateFile function.

        // For more information about CreateFile, see the unmanaged MSDN reference library.

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

        private static extern IntPtr CreateFile(string lpFileName, uint dwDesiredAccess,

          uint dwShareMode, IntPtr lpSecurityAttributes, uint dwCreationDisposition,

          uint dwFlagsAndAttributes, IntPtr hTemplateFile);

 

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

        private static extern bool ReadFile(

            IntPtr hFile,                        // handle to file

            byte[] lpBuffer,                // data buffer

            int nNumberOfBytesToRead,        // number of bytes to read

            ref int lpNumberOfBytesRead,    // number of bytes read

            IntPtr lpOverlapped

            //

            // ref OVERLAPPED lpOverlapped        // overlapped buffer

            );

........

 

Использование:

 

            // Try to open the file.

            IntPtr ptr = CreateFile(Path, GENERIC_READ, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);

            Console.WriteLine($"Path: {Path}; descriptor: {ptr:X8}h");

 

            handleValue = new SafeFileHandle(ptr, true);

            _fs = new FileStream(handleValue, FileAccess.Read);