在 C# 中递归上传到 FTP 服务器

问题描述

我需要通过 C# 代码将一个文件夹(包含子文件夹和文件)从一台服务器上传到另一台服务器.我做了一些研究，发现我们可以使用 FTP 来实现这一点.但是这样我就只能移动文件而不是整个文件夹.任何帮助在这里表示赞赏.

I would need to upload a folder (which contains sub folders and files) from one server to another from C# code. I have done few research and found that we can achieve this using FTP. But with that I am able to move only files and not the entire folder. Any help here is appreciated.

推荐答案

FtpWebRequest(也不是 .NET 框架中的任何其他 FTP 客户端)确实没有任何明确支持递归文件操作(包括上传).您必须自己实现递归:

The FtpWebRequest (nor any other FTP client in .NET framework) indeed does not have any explicit support for recursive file operations (including uploads). You have to implement the recursion yourself:

• 列出本地目录
• 迭代条目、上传文件并递归到子目录(再次列出它们等)

void UploadFtpDirectory(string sourcePath, string url, NetworkCredential credentials)
{
    IEnumerable<string> files = Directory.EnumerateFiles(sourcePath);
    foreach (string file in files)
    {
        using (WebClient client = new WebClient())
        {
            Console.WriteLine($"Uploading {file}");
            client.Credentials = credentials;
            client.UploadFile(url + Path.GetFileName(file), file);
        }
    }

    IEnumerable<string> directories = Directory.EnumerateDirectories(sourcePath);
    foreach (string directory in directories)
    {
        string name = Path.GetFileName(directory);
        string directoryUrl = url + name;

        try
        {
            Console.WriteLine($"Creating {name}");
            FtpWebRequest requestDir = (FtpWebRequest)WebRequest.Create(directoryUrl);
            requestDir.Method = WebRequestMethods.Ftp.MakeDirectory;
            requestDir.Credentials = credentials;
            requestDir.GetResponse().Close();
        }
        catch (WebException ex)
        {
            FtpWebResponse response = (FtpWebResponse)ex.Response;
            if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
            {
                // probably exists already
            }
            else
            {
                throw;
            }
        }

        UploadFtpDirectory(directory, directoryUrl + "/", credentials);
    }
}

有关创建文件夹的复杂代码的背景，请参阅:
如何检查FTP目录是否存在

使用如下函数:

string sourcePath = @"C:sourcelocalpath";
// root path must exist
string url = "ftp://ftp.example.com/target/remote/path/";
NetworkCredential credentials = new NetworkCredential("username", "password");

UploadFtpDirectory(sourcePath, url, credentials);

一个更简单的变体，如果您不需要递归上传:
使用WebClient将文件目录上传到FTP服务器

A simpler variant, if you do not need a recursive upload:
Upload directory of files to FTP server using WebClient

或者使用可以自行进行递归的 FTP 库.

Or use FTP library that can do the recursion on its own.

例如，使用 WinSCP .NET 程序集，您只需调用一次即可上传整个目录Session.PutFilesToDirectory:

For example with WinSCP .NET assembly you can upload whole directory with a single call to the Session.PutFilesToDirectory:

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

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

    // Download files
    session.PutFilesToDirectory(@"C:sourcelocalpath", "/target/remote/path").Check();
}

Session.PutFilesToDirectory 方法默认是递归的.

The Session.PutFilesToDirectory method is recursive by default.

(我是 WinSCP 的作者)

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