定义FileStream类的操作类:操作类名: FtpUpDown

上传文件

/// 
         /// 上传文件         /// 
         /// 上传文件的全路径 例@"D:\123.txt"         ///          /// 
              public bool Upload(string localpath, string ftppath)         {             bool bol = false;             try             {                 FileInfo fileInf = new FileInfo(localpath);                 //替换符号                 ftppath = ftppath.Replace("\\", "/");                 //组合ftp上传文件路径                 string uri = "ftp://" + ftppath + "/" + fileInf.Name;                   // 根据uri创建FtpWebRequest对象                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));                 // 指定数据传输类型                 reqFTP.UseBinary = true;                 // ftp用户名和密码                 reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);                 // 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                 {                     // 把上传的文件写入流                     Stream strm = reqFTP.GetRequestStream();                     // 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);                         bol = true;                     }                     // 关闭两个流                     strm.Close();                     fs.Close();                 }                 catch (Exception ex)                 {                     MessageBox.Show("上传文件失败，失败原因；" + ex.Message);                 }             }             catch (Exception ex)             {                 MessageBox.Show("上传文件失败，失败原因；" + ex.Message);             }             return bol;         }     下载文件: /// 
         /// 下载文件         /// 
         ///          ///          ///          /// 
              public bool Download(string localpath, string fileName, out string errorinfo)         {             try             {                 String onlyFileName = Path.GetFileName(fileName);                 string newFileName = localpath + "\\" + onlyFileName;                   if (File.Exists(newFileName))                 {                     errorinfo = string.Format("本地文件{0}已存在,无法下载", newFileName);                     return false;                 }                 string url = "ftp://" + ftpServerIP + "/FileInfo/" + fileName;                 // 根据uri创建FtpWebRequest对象                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));                 // 指定数据传输类型                 reqFTP.UseBinary = true;                 // ftp用户名和密码                 reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();                 Stream ftpStream = response.GetResponseStream();                 long cl = response.ContentLength;                 int bufferSize = 2048;                 int readCount;                 byte[] buffer = new byte[bufferSize];                 readCount = ftpStream.Read(buffer, 0, bufferSize);                   FileStream outputStream = new FileStream(newFileName, FileMode.Create, FileAccess.Write);                 while (readCount > 0)                 {                     outputStream.Write(buffer, 0, readCount);                     readCount = ftpStream.Read(buffer, 0, bufferSize);                 }                 ftpStream.Close();                 outputStream.Close();                 response.Close();                 errorinfo = "";                 return true;             }             catch (Exception ex)             {                 errorinfo = string.Format("因{0},无法下载", ex.Message);                 return false;             }         }     调用方法： /// 
         /// 上传         /// 
         ///          ///          private void Button_Click_1(object sender, RoutedEventArgs e)         {             FtpUpDown ftp = new FtpUpDown(ftpServerIP, ftpUserID, ftpPassword);             string localpath = @"D:\123.txt";             string ftppath =  ftpServerIP + @"\FileInfo";             bool bol = ftp.Upload(localpath, ftppath);             if (bol == true)                 MessageBox.Show("上传成功");             else                 MessageBox.Show("上传失败");         }           /// 
         /// 下载         /// 
         ///          ///          private void Button_Click_2(object sender, RoutedEventArgs e)         {             string errorinfo;             string localpath = @"E:\qzq\FileInfo";               if (!Directory.Exists(localpath))             {                 Directory.CreateDirectory(localpath);             }             string filename = "123.txt";             if (!File.Exists(localpath + "\\" + filename))             {                   FtpUpDown ftp = new FtpUpDown(ftpServerIP, ftpUserID, ftpPassword);                 bool bol = ftp.Download(localpath, filename, out errorinfo);                 if (bol == true)                     MessageBox.Show("下载成功");                 else                     MessageBox.Show("下载失败：" + errorinfo + "");             }             else             {                 MessageBox.Show("下载文件已存在!");             }         }

其中: ftpServerIP:上传服务的IP地址。

      ftpUserID: 上传服务的登录名。

ftpPassword: 上传服务的密码。