.NET FTP上载文件并保留原始日期时间

We have a Windows 2008 R2 web server with FTP over SSL. This app uses .NET 4.5 and when I upload files, the date/time on the file changes to the current date/time on the server. Is there a way to have the uploaded file preserve the original (last modified) date?

我们有一台带有FTP over SSL的Windows 2008 R2 Web服务器。此应用程序使用.NET 4.5，当我上传文件时，文件上的日期/时间将更改为服务器上的当前日期/时间。有没有办法让上传的文件保留原始（最后修改）日期？

Here is what I have:

这是我有的：

FtpWebRequest clsRequest = (FtpWebRequest)WebRequest.Create(FTPFilePath);
clsRequest.EnableSsl = true;
clsRequest.UsePassive = true;
clsRequest.Credentials = new NetworkCredential(swwwFTPUser, swwwFTPPassword);
clsRequest.Method = WebRequestMethods.Ftp.UploadFile;
Byte[] bFile = File.ReadAllBytes(LocalFilePath);
Stream clsStream = clsRequest.GetRequestStream();
clsStream.Write(bFile, 0, bFile.Length);
clsStream.Close();
clsStream.Dispose();
clsRequest = null;

2 个解决方案

#1

There's really no standard way to update timestamp of a remote file over an FTP protocol. That's probably why the FtpWebRequest does not support it.

实际上没有标准方法来通过FTP协议更新远程文件的时间戳。这可能就是FtpWebRequest不支持它的原因。

There are two non-standard ways to update the timestamp. Either a non-standard MFMT command:

有两种非标准方法可以更新时间戳。非标准MFMT命令：

MFMT yyyymmddhhmmss path

or a non-standard use of (otherwise standard) MDTM command:

或非标准使用（否则为标准）MDTM命令：

MDTM yyyymmddhhmmss path

But the FtpWebRequest does not allow you to send a custom command either.

但是FtpWebRequest也不允许您发送自定义命令。

See for example How to send arbitrary FTP commands in C#.

请参阅例如如何在C＃中发送任意FTP命令。

So you have to use a 3rd party FTP library.

所以你必须使用第三方FTP库。

For example WinSCP .NET assembly preserves a timestamp of an uploaded file by default.

例如，WinSCP .NET程序集默认保留上载文件的时间戳。

// Setup session options
SessionOptions sessionOptions = new SessionOptions
{
    Protocol = Protocol.Ftp,
    HostName = "example.com",
    UserName = "user",
    Password = "mypassword",
};

using (Session session = new Session())
{
    // Connect
    session.Open(sessionOptions);

    // Upload
    session.PutFiles(@"c:\toupload\file.txt*", "/home/user/").Check();
}

See a full example.

查看完整示例。

Note that WinSCP .NET assembly is not a native .NET assembly. It's rather a thin .NET wrapper around a console application.

请注意，WinSCP .NET程序集不是本机.NET程序集。它是一个围绕控制台应用程序的瘦.NET包装器。

(I'm the author of WinSCP)

（我是WinSCP的作者）

#2

I know that we can assign file attributes:-

我知道我们可以分配文件属性： -

//Change the file created time.
File.SetCreationTime(path, dtCreation);
//Change the file modified time.
File.SetLastWriteTime(path, dtModified);

If you can extract the original date before you save it to the server, then you can change file attributes....something like this:-

如果您可以在将原始日期保存到服务器之前提取原始日期，则可以更改文件属性....如下所示： -

Sftp sftp = new Sftp();
sftp.Connect(...);
sftp.Login(...);

// upload the file
sftp.PutFile(localFile, remoteFile);

// assign creation and modification time attributes
SftpAttributes attributes = new SftpAttributes();
System.IO.FileInfo info = new System.IO.FileInfo(localFile);
attributes.Created = info.CreationTime;
attributes.Modified = info.LastWriteTime;

// set attributes of the uploaded file
sftp.SetAttributes(remoteFile, attributes);

I hope this points you in the right direction.

我希望这能指出你正确的方向。

#1