如何获取FTP服务器上文件的最后修改时间

Question

            FtpWebRequest req = (FtpWebRequest)FtpWebRequest.Create(strFtpAddr);

            req.Method = WebRequestMethods.Ftp.GetDateTimestamp;
          
   
            req.UseBinary = true;
            req.Credentials = new NetworkCredential(txtUserName.Text.Trim(), txtPassword.Text.Trim());

            FtpWebResponse ftpResponse =(FtpWebResponse) req.GetResponse();

            StreamReader reader = new StreamReader(ftpResponse.GetResponseStream());
            string str = reader.ReadLine();
str为空,我是想获取FTP服务器上文件的最后修改时间，怎么获取？
比如ftp://aab.com/text.txt
文件的最后修改日期，怎么获取

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Answer 1

还有
ListDirectory
ListDirectoryDetails
可不可以传参数，搜索指定的文件，比如*.rar

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Answer 2

Response的下面这个属性可以获取日期

LastModified

获取 FTP 服务器上的文件的上次修改日期和时间。

关于FtpWebRequest可以查看 http://msdn.microsoft.com/zh-cn/library/system.net.ftpwebrequest(VS.80).aspx

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Answer 3

req.Method = WebRequestMethods.Ftp.DownloadFile;
          
   
            req.UseBinary = true;
            req.Credentials = new NetworkCredential(txtUserName.Text.Trim(), txtPassword.Text.Trim());

            FtpWebResponse ftpResponse =(FtpWebResponse) req.GetResponse();
            txtResult.Text += ftpResponse.LastModified.ToString()+"\r\n";
            StreamReader reader = new StreamReader(ftpResponse.GetResponseStream());
            string str = "";
            try
            {
                do
                {
                    str = reader.ReadLine();
                    txtResult.Text += str + "\r\n";
                } while (!string.IsNullOrEmpty(str));

            }
            catch (Exception ex)
            {
            }

LastModify为：0001-1-1 0:00:00

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