在C#中使用FtpWebRequest时设置端口号 [英] Set Port number when using FtpWebRequest in C#

问题描述

当我尝试使用VS2008作为调试器从C#代码通过FTP传输到Win 2008 Server时，总是出现异常.

I keep getting a exception when I try to FTP to my Win 2008 Server from C# code using VS2008 as debugger.

我的测试类如下:

public class FTP
{
    private string ftpServerIP = "192.168.10.35:21";
    private string ftpUserID = "Administrator";
    private string ftpPassword = "XXXXXXXX";
    private string uploadToFolder = "uploadtest";

    public void Upload(string filename)
    {
        FileInfo fileInf = new FileInfo(filename);
        string uri = "ftp://" + ftpServerIP + "/" + uploadToFolder + "/" + fileInf.Name;
        FtpWebRequest reqFTP;

        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
        reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
        reqFTP.KeepAlive = false;
        reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
        reqFTP.UseBinary = true;
        reqFTP.ContentLength = fileInf.Length;

        int buffLength = 2048;
        byte[] buff = new byte[buffLength];
        int contentLen;

        FileStream fs = fileInf.OpenRead();
        try
        {
            Stream strm = reqFTP.GetRequestStream();
            contentLen = fs.Read(buff, 0, buffLength);

            while (contentLen != 0)
            {
                strm.Write(buff, 0, contentLen);
                contentLen = fs.Read(buff, 0, buffLength);
            }

            strm.Close();
            fs.Close();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
    }
}

当我执行代码时，在GetRequestStream()调用中收到FTP错误227的连接失败.在例外情况下，我可以看到连接失败:192.168.10.35:52184

When I execute the code I get a Connection Failed with FTP error 227 in the GetRequestStream() call. In the exception I can see the connection fails to: 192.168.10.35:52184

我不知道端口52184是如何产生的.我在ftpServerIP中指定应为端口21.

I have no idea how it comes up with port 52184. I specify in the ftpServerIP that it should be port 21.

我在Google上发现了一些存在相同问题的人，但是我没有找到解决该问题的好例子，我仍然不明白为什么会发生这种情况.

I have found a few persons with the same issues on google but I haven't found a good example on how this is solved and I still don't understand why it happens.

任何人都知道如何处理此问题?

Anyone know how to handle this issue??

更新:

我尝试连接到其他FTP帐户，并且一切正常.因此，我测试了我的192.168.10.35:21 FTP，但在CuteFTP Pro之类的系统中工作正常.这只会使它更加奇怪..

I have tried to connect to a different FTP account and there it all works fine. Therefore I tested my 192.168.10.35:21 FTP but it works fine in CuteFTP Pro and the likes. This just makes it even more strange..

推荐答案

我的猜测是Windows防火墙问题，FTP使用的端口不只是端口21，有时将FTP模式从主动模式更改为被动模式有助于使工作正常./p>

My guess would be Windows firewall issues, FTP uses other ports than just port 21 - sometimes changing the FTP mode from active to passive helps to get things working.

reqFTP.UsePassive = false;

请参阅有关FTP的这篇好文章:主动FTP与被动FTP的明确解释

Look at this good article on FTP: Active FTP vs. Passive FTP, a Definitive Explanation

这篇关于在C#中使用FtpWebRequest时设置端口号的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！