.Net FtpWebRequest有时会失败 [英] .Net FtpWebRequest fails sometimes

问题描述

我尝试使用列表中的FtpWebRequest文件的细节，但很频繁失败并引发WebException并显示错误没有登录530用户。

I try to list file details using FtpWebRequest but very frequently it fails with a WebException and shows error 530 User not logged in.

这怎么可能，这一些时间使用相同的凭据？

How is this possible, that it works some of the time using the same credentials?

摘自代码：

        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpuri));
        reqFTP.UseBinary = true;
        reqFTP.Credentials = new NetworkCredential(userName, password);
        string[] downloadFiles = new string[0];
            reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
            WebResponse response = reqFTP.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream());
            downloadFiles = reader.ReadToEnd().Replace("\r\n", "¤").Split('¤');
            reader.Close();
            response.Close();

推荐答案

尝试设置

reqFTP.KeepAlive = false;

并且可能如果上述不起作用

and possibly if the above does not work

reqFTP.UsePassive = false;

我发现将这些设置为false减少了此错误的发生（这是由FTP服务器）很大。

I found that setting these to false reduced the occurrences of this error (which is generated by the FTP server) considerably.

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