的FtpWebRequest下载文件 [英] FtpWebRequest Download File

问题描述

以下code是为了获取通过FTP的文件。不过，我得到一个错误吧。

The following code is intended to retrieve a file via FTP. However, I'm getting an error with it.

serverPath = "ftp://x.x.x.x/tmp/myfile.txt";

FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverPath);

request.KeepAlive = true;
request.UsePassive = true;
request.UseBinary = true;

request.Method = WebRequestMethods.Ftp.DownloadFile;                
request.Credentials = new NetworkCredential(username, password);

// Read the file from the server & write to destination                
using (FtpWebResponse response = (FtpWebResponse)request.GetResponse()) // Error here
using (Stream responseStream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(responseStream))            
using (StreamWriter destination = new StreamWriter(destinationFile))
{
    destination.Write(reader.ReadToEnd());
    destination.Flush();
}

该错误是：

The remote server returned an error: (550) File unavailable (e.g., file not found, no access)

该文件肯定不会在远程机器上存在，我可以手动执行此FTP（即我有权限）。谁能告诉我为什么我可能会得到这个错误？

The file definately does exist on the remote machine and I am able to perform this ftp manually (i.e. I have permissions). Can anyone tell me why I might be getting this error?

推荐答案

这一段距离的 FptWebRequest类引用可能是你的兴趣：

This paragraph from the FptWebRequest class reference might be of interest to you:

的URI可能是相对或绝对的。
  如果URI是形式
  ftp://contoso.com/%2fpath（％2F是
  转义'/'），那么URI是
  绝对的，当前目录是
  /路径。然而，如果URI是的
  形成ftp://contoso.com/path，第一
  在.NET Framework登录到FTP
  服务器（使用的用户名和
  密码由证书设置
  属性），则当前目录
  设置为/路径

The URI may be relative or absolute. If the URI is of the form "ftp://contoso.com/%2fpath" (%2f is an escaped '/'), then the URI is absolute, and the current directory is /path. If, however, the URI is of the form "ftp://contoso.com/path", first the .NET Framework logs into the FTP server (using the user name and password set by the Credentials property), then the current directory is set to /path.

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