C# - FtpWebRequest - 通过同一连接/登录的多个请求

问题描述

我想循环访问 FTP 文件夹以检查文件是否到达

I want to loop on a FTP folder for check if a file has arrived

我愿意:

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://localhost:8080");
request.Credentials = new NetworkCredential("anonymous", "");
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;

while(true)
{
    using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
    using (Stream responseStream = response.GetResponseStream())
    using (StreamReader reader = new StreamReader(responseStream))
    {
        Console.WriteLine(reader.ReadToEnd());

        reader.Close();
        response.Close();
    }
}

但是在第二次迭代中我得到了一个异常:

But at the second iteration I get an exception:

无法读取流

推荐答案

对不起，我错过了，您只发出一个请求并尝试多次获得响应.试试下面的代码:

Sorry, I missed it, you're only issuing one request and trying to get a response multiple times. Try the code below:

while(true)
{
    FtpWebRequest request =     (FtpWebRequest)WebRequest.Create("ftp://localhost:8080");
    request.Credentials = new NetworkCredential("anonymous", "");
    request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;

    using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
    using (Stream responseStream = response.GetResponseStream())
    using (StreamReader reader = new StreamReader(responseStream))
    {
        Console.WriteLine(reader.ReadToEnd());

        reader.Close();
        response.Close();
    }
}

您应该在每个循环结束时添加某种暂停.你不想轰炸服务器.

You should add a pause of some sort at the end of each loop though. You don't want to bombard the server.

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