C#监听ftp文件传输完成

在C#中监听FTP文件传输完成通常涉及到使用FTP客户端库，如`System.Net.FtpClient`。下面是一个简单的示例，展示了如何在FTP上传文件后设置一个事件处理程序来检测传输是否已完成：

using System;
using System.IO;
using System.Net;

public class FtpMonitor
{
    private readonly FtpClient _ftpClient;
    private bool _isUploadFinished = false;
    public event EventHandler<FileTransferCompletedEventArgs> FileTransferCompleted;

    public FtpMonitor(string ftpServer, int port, string username, string password)
    {
        _ftpClient = new FtpClient();
        _ftpClient.Server = ftpServer;
        _ftpClient.Port = port;
        _ftpClient.Credentials = new NetworkCredential(username, password);
    }

    public void UploadFileAsync(string localFilePath, string remoteFilePath)
    {
        var transferCompletedHandler = (sender, e) =>
        {
            if (_ftpClient.LastError == null && _ftpClient.LastException == null)
            {
                _isUploadFinished = true;
                OnFileTransferCompleted(new FileTransferCompletedEventArgs { LocalPath = localFilePath, RemotePath = remoteFilePath });
            }
        };

        _ftpClient.UseBinary = true; // 如果需要二进制模式上传
        _ftpClient.UploadAsync(localFilePath, remoteFilePath, uploadProgressCallback: null, completed: transferCompletedHandler);
    }

    protected virtual void OnFileTransferCompleted(FileTransferCompletedEventArgs e)
    {
        if (FileTransferCompleted != null)
        {
            FileTransferCompleted(this, e);
        }
    }

    public void WaitForUploadCompletion()
    {
        while (!_isUploadFinished)
        {
            System.Threading.Thread.Sleep(100); // 等待一段时间检查状态
        }
    }
}

class Program
{
    static void Main(string[] args)
    {
        FtpMonitor ftp = new FtpMonitor("your_ftp_server", 21, "username", "password");
        ftp.FileTransferCompleted += (sender, e) => Console.WriteLine($"Upload of {e.LocalPath} to {e.RemotePath} has completed.");
        
        ftp.UploadFileAsync(@"C:\path\to\local\file.txt", "/remote/path/file.txt");
        ftp.WaitForUploadCompletion();
    }
}

在这个示例中，当你调用`UploadFileAsync`方法开始上传文件后，它会注册一个回调`transferCompletedHandler`，当文件上传完成后，这个事件会被触发，并设置 `_isUploadFinished`为true。`WaitForUploadCompletion`方法则会在后台持续检查直到上传完成。