Question

我有一个FTP（Filezila服务器），我想使用c＃下载一个大文件。

 WebClient client = new WebClient();
 client.Credentials = new NetworkCredential(userName, password);
 client.DownloadFile(new Uri("ftp://XXX.XXX.XXX.XXX/" + fileName), destinationFileFullPath);

或

 FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://XXX.XXX.XXX.XXX/" + fileName);
 request.Method = WebRequestMethods.Ftp.DownloadFile;
 request.KeepAlive = true; // I tried both
 request.UseBinary = true; // I tried both
 request.UsePassive = true; 
 request.Credentials = new NetworkCredential(userName, password);
 FtpWebResponse response = (FtpWebResponse)request.GetResponse();
 Stream responseStream = response.GetResponseStream();

 // Writing bytes to local files
 using (var outputStream = File.OpenWrite(destinationFileFullPath))
 {
     byte[] chunk = new byte[2048];
     int bytesRead;
     do
     {
         bytesRead = responseStream.Read(chunk, 0, chunk.Length);
         outputStream.Write(chunk, 0, bytesRead);
     } while (bytesRead > 0);

     outputStream.Flush();
}

responseStream.Close();
response.Close();

对于小文件，它运行良好，但对于大文件（大的意思是大约300MB以上）它可以工作，但在传输结束时（我在filezilla服务器端看到传输成功）由于未知原因我的应用程序只是挂在行

 client.DownloadFile(new Uri("ftp://XXX.XXX.XXX.XXX/" + fileName), destinationFileFullPath);

或

bytesRead = responseStream.Read(chunk, 0, chunk.Length);

直到我收到超时异常。如果我强行休息（暂停），我可以看到它真的停留在这条线上。就像Filezilla关闭连接而C＃只是等待更多阅读... 你有没有遇到过这个问题？

感谢您的帮助。

从FTP下载C＃下载大文件

0 个答案: