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C#或Asp.Net实现Ftp各种操作类：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

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

/// <summary>
/// FtpUpDown 的摘要说明
/// </summary>
public class FtpUpDown
{
    public FtpUpDown()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    string ftpServerIP;//服务器ip地址

    string ftpUserID;//用户名

    string ftpPassword;//密码

    FtpWebRequest reqFTP;

    private void Connect(String path)//连接ftp
    {

        // 根据uri创建FtpWebRequest对象

        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));

        // 指定数据传输类型

        reqFTP.UseBinary = true;

        // ftp用户名和密码

        reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

    }

    public FtpUpDown(string ftpServerIP, string ftpUserID, string ftpPassword)
    {
        this.ftpServerIP = ftpServerIP;

        this.ftpUserID = ftpUserID;

        this.ftpPassword = ftpPassword;
    }

    //都调用这个

    private string[] GetFileList(string path, string WRMethods)//上面的代码示例了如何从ftp服务器上获得文件列表
    {
        string[] downloadFiles=null;
        StringBuilder result = new StringBuilder();
        try
        {
            Connect(path);

            reqFTP.Method = WRMethods;

            WebResponse response = reqFTP.GetResponse();

            StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.Default);//中文文件名

            string line = reader.ReadLine();

            while (line != null)
            {

                result.Append(line);

                result.Append("\n");

                line = reader.ReadLine();

            }

            // to remove the trailing '\n'

            result.Remove(result.ToString().LastIndexOf('\n'), 1);

            reader.Close();

            response.Close();

            return result.ToString().Split('\n');

        }

        catch (Exception ex)
        {
            return downloadFiles;
        }
    }

    public string[] GetFileList(string path)//上面的代码示例了如何从ftp服务器上获得文件列表
    {
        return GetFileList("ftp://" + ftpServerIP + "/" + path, WebRequestMethods.Ftp.ListDirectory);
    }
    public string[] GetFileList()//上面的代码示例了如何从ftp服务器上获得文件列表
    {
        return GetFileList("ftp://" + ftpServerIP + "/", WebRequestMethods.Ftp.ListDirectory);
    }

    public void Upload(string filename) //上面的代码实现了从ftp服务器上载文件的功能
    {
        FileInfo fileInf = new FileInfo(filename);

        string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;

        Connect(uri);//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)
        {

        }

    }

    public bool Download(string filePath, string fileName, string fileNewName, out string errorinfo)////上面的代码实现了从ftp服务器下载文件的功能
    {
        try
        {
            //String onlyFileName = Path.GetFileName(fileName);

            string newFileName = filePath + "\\" + fileNewName;

            if (Directory.Exists(filePath) == false)
            {
                Directory.CreateDirectory(filePath);
            }

            if (File.Exists(newFileName) == true)
            {
                File.Delete(newFileName); //删除已经存在的合同文件
            }

            string url = "ftp://" + ftpServerIP + "/" + fileName;
            Connect(url);//连接
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            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);

            FileStream outputStream = new FileStream(newFileName, FileMode.Create);
            while (readCount > 0)
            {
                outputStream.Write(buffer, 0, readCount);
                readCount = ftpStream.Read(buffer, 0, bufferSize);
            }
            ftpStream.Close();
            outputStream.Close();
            response.Close();

            errorinfo = "";

            return true;

        }

        catch (Exception ex)
        {
            errorinfo = string.Format("因{0},无法下载", ex.Message);

            return false;

        }

    }

    //删除文件

    public void DeleteFileName(string fileName)
    {
        try
        {
            FileInfo fileInf = new FileInfo(fileName);

            string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;

            Connect(uri);//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.DeleteFile;

            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
            response.Close();

        }

        catch (Exception ex)
        {

        }

    }

    //创建目录

    public void MakeDir(string dirName)
    {
        try
        {
            string uri = "ftp://" + ftpServerIP + "/" + dirName;

            Connect(uri);//连接     

            reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;

            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

            response.Close();

        }

        catch (Exception ex)
        {

        }

    }

    //删除目录

    public void delDir(string dirName)
    {
        try
        {
            string uri = "ftp://" + ftpServerIP + "/" + dirName;

            Connect(uri);//连接     

            reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;

            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

            response.Close();

        }

        catch (Exception ex)
        {

        }

    }

    //获得文件大小

    public long GetFileSize(string filename)
    {

        long fileSize = 0;

        try
        {

            FileInfo fileInf = new FileInfo(filename);

            string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;

            Connect(uri);//连接     

            reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;

            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

            fileSize = response.ContentLength;

            response.Close();

        }

        catch (Exception ex)
        {

        }

        return fileSize;

    }

    //文件改名

    public void Rename(string currentFilename, string newFilename)
    {
        try
        {
            FileInfo fileInf = new FileInfo(currentFilename);

            string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;

            Connect(uri);//连接

            reqFTP.Method = WebRequestMethods.Ftp.Rename;

            reqFTP.RenameTo = newFilename;

            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

            //Stream ftpStream = response.GetResponseStream();

            //ftpStream.Close();

            response.Close();

        }

        catch (Exception ex)
        {

        }

    }

    //获得文件明晰

    public string[] GetFilesDetailList()
    {

        return GetFileList("ftp://" + ftpServerIP + "/", WebRequestMethods.Ftp.ListDirectoryDetails);

    }

    //获得文件明晰

    public string[] GetFilesDetailList(string path)
    {

        return GetFileList("ftp://" + ftpServerIP + "/" + path, WebRequestMethods.Ftp.ListDirectoryDetails);

    }
}

下载实例：

FtpUpDown ftpUpDown = new FtpUpDown("ftpIp地址", "ftp账号", "ftp密码");

string fileName = "ftp上的文件名（去掉ftp地址的路径）";

string errInfo = "";

string fileNewName = DateTime.Now.ToString("yyyyMMddHHmmssffff") + System.IO.Path.GetExtension(fileName);
bool isDown = ftpUpDown.Download(Server.MapPath("../filePth"), fileName, fileNewName, out errInfo);
if (isDown)
{
      MessageBox.ResponseScript(this, "alert('下载成功！');");
}
else
{
     MessageBox.ResponseScript(this, "alert('下载失败！');");
}