问题与FtpWebRequest getDateTimestamp和DateTime [英] Issue with FtpWebRequest getDateTimestamp and DateTime

问题描述

我正在写一个程序，我有点麻烦。程序检查在远程ftp站点上创建的文件的日期，然后如果匹配今天的日期，它将下载文件上传到另一个ftp站点。我运行程序时收到以下错误：

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

这是我用于将ftp文件创建日期转换为日期时间的代码

  / *获取创建文件的日期/时间* / 
 string fileDateTime = DownloadftpClient.getFileCreatedDateTime（test.txt）; 
 Console.WriteLine（fileDateTime）; 
 DateTime dateFromString = DateTime.Parse（fileDateTime，System.Globalization.CultureInfo.InvariantCulture.DateTimeFormat）; 
 Console.WriteLine（dateFromString）; 
  

任何关于我在这里做错的想法？​​

解决方案

如果从服务器返回的字符串是 20121128194042 ，那么你的代码需要是：

  DateTime dateFromString = DateTime.ParseExact（fileDateTime，
yyyyMMddHHmmss，//指定收到的确切日期/时间格式
 System.Globalization.CultureInfo.InvariantCulture.DateTimeFormat）; 
  

编辑

getFileCreatedDateTime 方法的正确代码应该是：

  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（）; 
 
返回ftpResponse.LastModified; 
} 
 catch（Exception ex）
 {
 //不喜欢这样做，但我会在这里留下
 //来保持与现有代码：
 Console.WriteLine（ex.ToString（））; 
} 
 
返回DateTime.MinValue; 
} 
  

（从这个答案。）

然后调用代码变成：

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

I'm having a bit of trouble with a program that I'm writing. The program checks the date created of a file on a remote ftp site, then if it matched today's date it will download the file the upload it to another ftp site. I get the following error when I run the program:

unhandled exception system.formatexception string was not recognized as a valid datetime

Here is the code I'm using to convert the ftp file created date to a datetime

/* 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);

Any ideas on what I'm doing wrong here?

解决方案

If the string returned from the sever is 20121128194042, then your code needs to be:

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

EDIT

The correct code for the getFileCreatedDateTime method should be:

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;
}

(With help from this answer.)

The calling code then becomes:

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

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