C#实现FTP文件下载：步骤与示例

#region 下载FTP文件方法―公用方法

//调用方法
Download("ftpuser", "bjxh6Yz+", string.Format(@"ftp://10.124.14.25//opt/ftpuser/image/"), string.Format(@"D:\FTPDownLoad\"), "1.jpg");//下载ftp图片到本地

        public string Download(string userId, string pwd, string ftpPath, string filePath, string fileName)//用户名 密码 ftp文件路径 下载到本地路径 文件名
        {
            string sRet = "下载成功！";
            FtpWebRequest reqFTP;
            try
            {
                FileStream outputStream = new FileStream(filePath + fileName, FileMode.Create);
                // 根据uri创建FtpWebRequest对象     
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpPath + fileName));
                // 指定执行什么命令    
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                // 指定数据传输类型    
                reqFTP.UseBinary = true;
                reqFTP.UsePassive = false;
                // ftp用户名和密码    
                reqFTP.Credentials = new NetworkCredential(userId, pwd);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                // 把下载的文件写入流  
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                // 缓冲大小设置为2kb    
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                // 每次读文件流的2kb