断点续传问题

Question

FtpWebRequest request =
                        (FtpWebRequest)WebRequest.Create(server);
                    request.Credentials = new NetworkCredential(username, password);
                    request.Method = WebRequestMethods.Ftp.ListDirectory;
                    response = (FtpWebResponse)request.GetResponse();
                    stream = response.GetResponseStream();                    //  获取文件列表;
                    StreamReader reader = new StreamReader(stream);
                    string content = reader.ReadToEnd();
                    string[] files = content.Split('\n');
                    int s = files.Length;
                    reader.Close();                    //下载列表文件
                    serverDirectory = null;
                    Uri baseUri = new Uri(server);                    for (int i = 0; i <= s - 2; i++)
                    {
                    
                            string filename = files[i].ToString().Trim();
                            string fullFilename = serverDirectory + @"/" + filename;
                            Uri uri = new Uri(baseUri, fullFilename);
                            request = (FtpWebRequest)WebRequest.Create(uri);
                            request.Credentials = new NetworkCredential(username, password);
                            request.Method = WebRequestMethods.Ftp.DownloadFile;
                            response = (FtpWebResponse)request.GetResponse();
                            inStream = response.GetResponseStream();
                            //  inStream.Length                                             File.Create(downaddress + filename);
                            outStream = File.OpenWrite(downaddress+ @"\" + filename);
                            byte[] buffer = new byte[1024];                            int size = 0;
                            while ((size = inStream.Read(buffer, 0, 1024)) > 0)
                            {
                            
                                outStream.Write(buffer, 0, size);
                            }
                            outStream.Flush();
                            outStream.Close();能在这个基础上实现吗？

Answer 1

断点续传关键是看你的服务端能不能提供断点的功能，如果支持的话，客户端只需要发送一个rang()就可以了。

Answer 2

to byktwc(博眼看天) 
ftp服务器可以提供断点续传吗？

Answer 3

应该是可以的，你下载文件的程序要实现连接服务器，然后在程序里向服务器传送addrang()请求，基本上就可以了。