如何检查FTP连接？

Question

是否有一种简单,快速的方法来检查FTP连接(包括主机,端口,用户名和密码)是否有效且有效？我正在使用C#.谢谢.

Answer 1

尝试这样的事情:

        FtpWebRequest requestDir = (FtpWebRequest)FtpWebRequest.Create("ftp://ftp.google.com");
        requestDir.Credentials = new NetworkCredential("username", "password");
        try
        {
            WebResponse response = requestDir.GetResponse();
            //set your flag
        }
        catch
        {
        }

Answer 2

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private bool isValidConnection(string url, string user, string password)
        {
            try
            {
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create(url);
                request.Method = WebRequestMethods.Ftp.ListDirectory;
                request.Credentials = new NetworkCredential(user, password);
                request.GetResponse();
            }
            catch(WebException ex)
            {
                return false;
            }
            return true;
        }