调用：

FtpOption ftp = new FtpOption("10.128.3.90", "21", "uid", "pwd");

下载文件：

bool success = ftp.DownLoadNotReName("ST/mylyb/grapes/03/11041112.003", "E:/");bool success = ftp.DownLoadReName("ST/myl-yb/grapes/03/11041112.003", "E:/rename.003");

上传文件：

bool success=ftp.UploadFile("G:/Ftp.txt","temp"); 

类：

using System;

using System.IO;

using System.Net;

namespace WindowsFormsApplication1

{

    public class FtpOption

    {

        #region

        string serverIP;

        string serverPort;

        string userId;

        string passWord;

        public FtpOption(string serverIP, string serverPort, string userId, string passWord)

        {

            this.serverIP = serverIP;

            this.serverPort = serverPort ?? "21";

            this.userId = userId;

            this.passWord = passWord;

        }

        private FtpWebRequest OpenRequest(Uri uri, string ftpMethord)

        {

            try

            {

                FtpWebRequest ftpRequest = (FtpWebRequest)FtpWebRequest.Create(uri);

                ftpRequest.Credentials = new NetworkCredential(userId, passWord);

                ftpRequest.Method = ftpMethord;

                ftpRequest.UseBinary = true;

                return ftpRequest;

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

        private FtpWebResponse OpenResponse(Uri uri, string ftpMethord)

        {

            try

            {

                return this.OpenRequest(uri, ftpMethord).GetResponse() as FtpWebResponse;

            }

            catch

            {

                throw new Exception("登录到Ftp服务器失败！");

            }

        }

        #endregion

        /// <summary>

        /// 下载（重命名）

        /// </summary>

        /// <param name="sourceFullPath">下载文件全路径</param>

        /// <param name="targetFullPath">下载到本机全路径(包含文件名)</param>

        /// <returns></returns>

        public bool DownLoadReName(string sourceFullPath, string targetFullPath)

        {

            try

            {

                Uri uri = new Uri(string.Format("ftp://{0}/{1}", serverIP, sourceFullPath));

                FtpWebResponse downloadResponse = OpenResponse(uri, WebRequestMethods.Ftp.DownloadFile);

                Stream responseStream = downloadResponse.GetResponseStream();

                FileStream fileStream = File.Create(targetFullPath);

                byte[] buffer = new byte[1024];

                int bytesRead = 0;

                while (true)

                {

                    bytesRead = responseStream.Read(buffer, 0, buffer.Length);

                    if (bytesRead == 0)

                        break;

                    fileStream.Write(buffer, 0, bytesRead);

                }

                fileStream.Close();

                responseStream.Close();

                return true;

            }

            catch

            {

                throw new Exception("获取下载文件失败！");

            }

        }

        /// <summary>

        /// 下载（按原名直接）

        /// </summary>

        /// <param name="loadFullPath">下载文件的全路径</param>

        /// <param name="targePath">下载到指定的地址(E:/)</param>

        /// <returns></returns>

        public bool DownLoadNotReName(string sourceFullPath, string targePath)

        {

            try

            {

                string fileName = sourceFullPath.Substring(sourceFullPath.LastIndexOf("/"));

                return DownLoadReName(sourceFullPath, targePath + fileName);

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

        /// <summary>

        /// 文件上传

        /// </summary>

        /// <param name="sourceFullPath">要上传文件的地址(G:/Ftp.txt)</param>

        /// <param name="targetPath">服务器端地址(temp)</param>

        /// <returns></returns>

        public bool UploadFile(string sourceFullPath, string targetPath)

        {

            try

            {

                string fileName = sourceFullPath.Substring(sourceFullPath.LastIndexOf("/") + 1);

                //检查路径

                Uri uri = new Uri(string.Format("ftp://{0}:{1}/{2}/{3}", serverIP, serverPort, targetPath, fileName));

                FtpWebRequest request = this.OpenRequest(uri, WebRequestMethods.Ftp.UploadFile);

                Stream requestStream = request.GetRequestStream();

                FileStream fileStream = new System.IO.FileStream(sourceFullPath, FileMode.Open);

                byte[] buffer = new byte[1024];

                int bytesRead;

                while (true)

                {

                    bytesRead = fileStream.Read(buffer, 0, buffer.Length);

                    if (bytesRead == 0)

                        break;

                    requestStream.Write(buffer, 0, bytesRead);

                }

                requestStream.Close();

                request.GetResponse();

                return true;

            }

            catch (Exception)

            {

                return false;

            }

        }

    }

}