asp.net操作ftp通用代码

using System;
using System.Net;

namespace FTPExample
{
    public class FTPHelper
    {
        private string ftpServerUrl;
        private string ftpUserName;
        private string ftpPassword;

        public FTPHelper(string serverUrl, string userName, string password)
        {
            ftpServerUrl = serverUrl;
            ftpUserName = userName;
            ftpPassword = password;
        }

        public void UploadFile(string localFilePath, string remoteFileName)
        {
            string ftpUrl = ftpServerUrl + "/" + remoteFileName;
            using (WebClient client = new WebClient())
            {
                client.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
                client.UploadFile(ftpUrl, "STOR", localFilePath);
            }
        }

        public void DownloadFile(string remoteFilePath, string localFileName)
        {
            string ftpUrl = ftpServerUrl + "/" + remoteFilePath;
            using (WebClient client = new WebClient())
            {
                client.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
                client.DownloadFile(ftpUrl, localFileName);
            }
        }

        public void DeleteFile(string remoteFilePath)
        {
            string ftpUrl = ftpServerUrl + "/" + remoteFilePath;
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpUrl);
            request.Method = WebRequestMethods.Ftp.DeleteFile;
            request.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
            FtpWebResponse response = (FtpWebResponse)request.GetResponse();
            response.Close();
        }
    }
}

FTPHelper ftp = new FTPHelper("ftp://example.com", "username", "password");

// 上传文件
ftp.UploadFile("localfile.txt", "remotefile.txt");

// 下载文件
ftp.DownloadFile("remotefile.txt", "localfile.txt");

// 删除文件
ftp.DeleteFile("remotefile.txt");