c# ftp 上传文件 与 下载文件

//连接ftp
        private void Connect(String path)
        {
            // 根据uri创建FtpWebRequest对象
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));
            // 指定数据传输类型
            reqFTP.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
            reqFTP.UseBinary = true;
            reqFTP.UsePassive = false;
            // ftp用户名和密码
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
        }

public void Upload(string filename) //上面的代码实现了从ftp服务器上载文件的功能
        {
            FileInfo fileInf = new FileInfo(filename);
            string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
            Connect(uri);//连接          
            // 默认为true，连接不会被关闭
            // 在一个命令之后被执行
            reqFTP.KeepAlive = false;
            // 指定执行什么命令
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
            // 上传文件时通知服务器文件的大小
            reqFTP.ContentLength = fileInf.Length;
            // 缓冲大小设置为kb 
            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
            {
                int allbye = (int)fileInf.Length;
                int startbye = 0;// 把上传的文件写入流
                Stream strm = reqFTP.GetRequestStream();//根据服务器的FTP配置不同，要使用不同的模式，否则会报错
                // 每次读文件流的kb 
                contentLen = fs.Read(buff, 0, buffLength);// 流内容没有结束
                while (contentLen != 0)
                {
                    // 把内容从file stream 写入upload stream 
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                    startbye += buffLength;
                }// 关闭两个流
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                this.WriteLog("上传失败,原因: " + ex.Message);

                fs.Close();
            }

        }

/// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public Byte[] Download(string fileName)/**/////上面的代码实现了从ftp服务器下载文件的功能
        {
            Byte[] rtn = null;
            try
            {
                long allbye = (long)GetFileSize(fileName);
                string url = "ftp://" + ftpServerIP + "/" + fileName;
                Connect(url);//连接  
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.KeepAlive = false;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount = 0;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read(buffer, 0, bufferSize);
                MemoryStream mstream = new MemoryStream();
                int startbye = 0;
                while (readCount > 0)
                {
                    mstream.Write(buffer, 0, readCount);

                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                    startbye += readCount;
                }
                rtn = mstream.ToArray();
                ftpStream.Close();
                response.Close();
                mstream.Close();
                return rtn;
            }
            catch (Exception ex)
            {
                //errorinfo = string.Format("因{0},无法下载", ex.Message);
                throw new Exception("下载失败，原因: " + ex.Message);
            }
        }

转载地址: https://www.cnblogs.com/big-lll/p/9225003.html