c# - C#递归上传到FTP服务器

Question

我需要通过 C# 代码将文件夹(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 实现这一点。但是有了它，我只能移动文件而不是整个文件夹。在这里的任何帮助表示赞赏。

Answer 1

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

• 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背景，请参阅:
How to check if an FTP directory exists

使用如下函数:

string sourcePath = @"C:\source\local\path";
// 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，如果你不需要递归上传:
Upload directory of files to FTP server using WebClient

---

或者使用可以自行递归的FTP库。

例如 WinSCP .NET assembly您可以通过一次调用 Session.PutFilesToDirectory 来上传整个目录:

// 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:\source\local\path", "/target/remote/path").Check();
}

Session.PutFilesToDirectory method默认是递归的。

(我是 WinSCP 的作者)