FtpWebRequest getDateTimestamp和DateTime的问题

Question

我正在编写一个正在编写程序的麻烦。该程序检查远程ftp站点上的文件创建日期，如果它匹配今天的日期，它将下载文件，将其上传到另一个ftp站点。运行程序时出现以下错误：

未处理的异常system.formatexception字符串未被识别为有效的日期时间

以下是我用来将ftp文件创建日期转换为日期时间

的代码

/* Get the Date/Time a File was Created */
string fileDateTime = DownloadftpClient.getFileCreatedDateTime("test.txt");
Console.WriteLine(fileDateTime);
DateTime dateFromString = DateTime.Parse(fileDateTime, System.Globalization.CultureInfo.InvariantCulture.DateTimeFormat);
Console.WriteLine(dateFromString);

关于我在这里做错了什么想法？

Answer 1

如果从服务器返回的字符串是20121128194042，那么您的代码必须是：

DateTime dateFromString = DateTime.ParseExact(fileDateTime, 
   "yyyyMMddHHmmss", // Specify the exact date/time format received
   System.Globalization.CultureInfo.InvariantCulture.DateTimeFormat);

修改

getFileCreatedDateTime方法的正确代码应为：

public DateTime getFileCreatedDateTime(string fileName)
{
    try
    {
        ftpRequest = (FtpWebRequest)FtpWebRequest.Create(host + "/" + fileName);
        ftpRequest.Credentials = new NetworkCredential(user, pass);

        ftpRequest.UseBinary = true;
        ftpRequest.UsePassive = true;
        ftpRequest.KeepAlive = true;

        ftpRequest.Method = WebRequestMethods.Ftp.GetDateTimestamp;
        ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();

        return ftpResponse.LastModified;
    }
    catch (Exception ex) 
    {
        // Don't like doing this, but I'll leave it here
        // to maintain compatability with the existing code:
        Console.WriteLine(ex.ToString());
    }

    return DateTime.MinValue;
}

（在this answer的帮助下。）

然后调用代码变为：

DateTime lastModified = DownloadftpClient.getFileCreatedDateTime("test.txt");