C#实现上传文件到FTP服务器：示例与代码

        #region 上传图片到FTP公共方法

        //调用方法
        string state = UploadFileByFtpWebRequest(fileName, "10.165.12.5", "/opt/ftpuser/image", "admin", "123456");


        private static string UploadFileByFtpWebRequest(string fileName, string ftpServerIP, string path, string userName, string password)
        {
            if (File.Exists(fileName))
            {
                FtpWebRequest reqFTP;
                FileInfo FileInf = new FileInfo(fileName);
                string FtpFullPath = "ftp://" + ftpServerIP + "/" + path + "/" + FileInf.Name;
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(FtpFullPath));
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(userName, password);//用户验证
                reqFTP.KeepAlive = false;
                reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
                reqFTP.ContentLength = FileInf.Length;

                int buffLength = 2048;
                byte[] buff = new byte[buffLength];
                int contentLen;
                // 打开一个文件流(System.IO.FileStream) 去读上传的文件
                FileStream fs = FileInf.OpenRead();
                try
                {
                    Stream strm = reqFTP.GetRequestStream();// 把上传的文件写入流
                    contentLen = fs.Read(buff, 0, buffLength);
                    while (contentLen != 0)// 流内容没有结束