FtpWebRequest reqFTP;
            FileStream outputStream = null;
            FtpWebResponse response = null;
            Stream ftpStream = null;
            try
            {
                outputStream = new FileStream(a_LocalPath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(a_FTPPath));
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(a_UserName, a_UserPwd);
                response = (FtpWebResponse)reqFTP.GetResponse();
                ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }
                ftpStream.Close();
                outputStream.Close();
                response.Close();
            }我确认路径和用户名和密码是正确的。