提供一个对FTP文件各种操作的类

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Net;

namespace BaseInfo
{
    public enum Ftpud
    {
        up = 0,
        down = 1,
    };
    /// <summary>
    ///
    /// </summary>
    public class ftpOperater
    {
        private string ftpServerIP;
        private string ftpUser;
        private string ftpPwd;

        FtpWebRequest reqFTP;
        public ftpOperater(Ftpud ftpud)
        {
            if (ftpud == Ftpud.up)
            {
                this.ftpServerIP = G_INI.ReadValue("ftp", "FTP_Up");
            }
            else if (ftpud == Ftpud.down)
            {
                this.ftpServerIP = G_INI.ReadValue("ftp", "FTP_Down");
            }
            this.ftpUser = G_INI.ReadValue("ftp", "FTP_USER");
            this.ftpPwd = G_INI.ReadValue("ftp", "FTP_PWD");
        }

        /// <summary>
        /// 连接ftp 上传文件使用
        /// </summary>
        /// <param name="filename">文件名</param>
        private void Connect(string filename)
        {
            // 根据uri创建FtpWebRequest对象
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpServerIP + filename));
            // 指定数据传输类型
            reqFTP.UseBinary = true;
            // ftp用户名和密码
            reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPwd);
        }
        /// <summary>
        /// 获取ftp服务器上的文件信息
        /// </summary>
        /// <returns>存储了所有文件信息的字符串数组</returns>
        public string[] GetFileList()
        {
            string[] downloadFiles;
            StringBuilder result = new StringBuilder();
            try
            {

                // 根据uri创建FtpWebRequest对象
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpServerIP));
                // 指定数据传输类型
                reqFTP.UseBinary = true;
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPwd);
                reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream());

                string line = reader.ReadLine();
                while (line != null)
                {
                    result.Append(line);
                    result.Append("\n");
                    line = reader.ReadLine();
                }
                result.Remove(result.ToString().LastIndexOf(‘\n‘), 1);
                reader.Close();
                response.Close();

                return result.ToString().Split(‘\n‘);
            }
            catch (Exception ex)
            {
                downloadFiles = null;
                return downloadFiles;
            }
        }

        /// <summary>
        /// 获取FTP上指定文件的大小
        /// </summary>
        /// <param name="filename">文件名</param>
        /// <returns>文件大小</returns>
        public long GetFileSize(string filename)
        {
            long fileSize = 0;
            try
            {

                // 根据uri创建FtpWebRequest对象
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpServerIP + filename));
                // 指定数据传输类型
                reqFTP.UseBinary = true;
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPwd);
                reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                fileSize = response.ContentLength;

                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
            }
            return fileSize;
        }

        /// <summary>
        /// 实现ftp下载操作
        /// </summary>
        /// <param name="filePath">保存到本地的文件名</param>
        /// <param name="fileName">远程文件名</param>
        public bool Download(string filePath, string fileName, out string Errortstr)
        {
            Errortstr = "";
            try
            {
                //filePath = <<The full path where the file is to be created.>>,
                //fileName = <<Name of the file to be created(Need not be the name of the file on FTP server).>>
                FileStream outputStream = new FileStream(filePath + fileName, FileMode.Create);
                // 根据uri创建FtpWebRequest对象
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpServerIP + fileName));
                // 指定数据传输类型
                reqFTP.UseBinary = true;
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPwd);
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];

                readCount = ftpStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }

                ftpStream.Close();
                outputStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {

                Errortstr = ex.Message;
                return false;
            }
            return true;
        }
        /// <summary>
        /// 从ftp服务器上载文件的功能
        /// </summary>
        /// <param name="filename">本地文件目录</param>
        public bool Upload(string filename, out string Errortstr)
        {
            Errortstr = "";
            FileInfo fileInf = new FileInfo(filename);
            Connect(fileInf.Name);//连接
            // 默认为true，连接不会被关闭
            // 在一个命令之后被执行
            reqFTP.KeepAlive = false;
            // 指定执行什么命令
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
            // 上传文件时通知服务器文件的大小
            reqFTP.ContentLength = fileInf.Length;
            // 缓冲大小设置为kb
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            // 打开一个文件流(System.IO.FileStream) 去读上传的文件
            FileStream fs = fileInf.OpenRead();
            try
            {

                // 把上传的文件写入流
                Stream strm = reqFTP.GetRequestStream();
                // 每次读文件流的kb
                contentLen = fs.Read(buff, 0, buffLength);
                // 流内容没有结束
                while (contentLen != 0)
                {
                    // 把内容从file stream 写入upload stream
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
                // 关闭两个流
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                Errortstr = ex.Message;
                return false;
            }
            return true;
        }
        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="fileName">文件名称</param>
        public void DeleteFileName(string fileName)
        {
            try
            {
                // 根据uri创建FtpWebRequest对象
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpServerIP + fileName));
                // 指定数据传输类型
                reqFTP.UseBinary = true;
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPwd);
                // 默认为true，连接不会被关闭
                // 在一个命令之后被执行
                reqFTP.KeepAlive = false;
                // 指定执行什么命令
                reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
            }
        }
        /// <summary>
        /// 创建目录
        /// </summary>
        /// <param name="dirName"></param>
        public void MakeDir(string dirName)
        {
            try
            {
                // 根据uri创建FtpWebRequest对象
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(dirName));
                // 指定数据传输类型
                reqFTP.UseBinary = true;
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPwd);
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
            }
        }
        /// <summary>
        /// 删除目录
        /// </summary>
        /// <param name="dirName"></param>
        public void delDir(string dirName)
        {
            try
            {
                // 根据uri创建FtpWebRequest对象
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(dirName));
                // 指定数据传输类型
                reqFTP.UseBinary = true;
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPwd);
                reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
            }
        }
        /// <summary>
        /// 文件改名
        /// </summary>
        /// <param name="currentFilename"></param>
        /// <param name="newFilename"></param>
        public void Rename(string currentFilename, string newFilename)
        {
            try
            {
                FileInfo fileInf = new FileInfo(currentFilename);

                // 根据uri创建FtpWebRequest对象
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpServerIP));
                // 指定数据传输类型
                reqFTP.UseBinary = true;
                // ftp用户名和密码
                reqFTP.Credentials = new NetworkCredential(ftpUser, ftpPwd);
                reqFTP.Method = WebRequestMethods.Ftp.Rename;
                reqFTP.RenameTo = newFilename;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                //Stream ftpStream = response.GetResponseStream();
                //ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
            }
        }
    }

}