using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;
using?System.IO;
using?System.Net;
using?System.Diagnostics;
using?System.Text.Regularexpressions;
using?System.Web;

///?

///FtpManager?的摘要說明
///?

public?class?FtpManager
{
????///?

????///?委托，用于標識當前文件下載百分比
????///?

????///?當前文件下載百分比
????//public??delegate?void?DelegateDldPercentage（double?dldPercentage）;

????///?

????///?當前下載文件百分比
????///?

????//public?static?event?DelegateDldPercentage?EDldPercentage;

????///?

????///?下載文件
????///?

????///?下載到本地的路徑
????///?要下載
????///?
????///?
????///?
????public?static?bool?DownloadFile（string?saveFilePath?string?filePath?string?ftpServerIP?string?ftpUserName?string?ftpPwd）
????{
????????if?（!Directory.Exists（saveFilePath）?&&?saveFilePath?!=?““?&&?saveFilePath?!=?null）
????????{
????????????Directory.CreateDirectory（saveFilePath）;
????????}
????????FileInfo?info?=?new?FileInfo（filePath）;
????????using?（FileStream?OutputStream?=?new?FileStream（saveFilePath?+?“/“?+?info.Name?FileMode.Create））????????
????????{
????????????try
????????????{
????????????????FtpWebRequest?ReqFTP?=?（FtpWebRequest）FtpWebRequest.Create（“ftp://“?+?ftpServerIP?+?“/“?+?filePath）;
????????????????ReqFTP.Method?=?WebRequestMethods.Ftp.DownloadFile;
????????????????ReqFTP.UseBinary?=?true;
????????????????ReqFTP.Credentials?=?new?NetworkCredential（ftpUserName?ftpPwd）;

????????????????using?（FtpWebResponse?response?=?（FtpWebResponse）ReqFTP.GetResponse（））
????????????????{
????????????????????////當前已下載文件百分比
????????????????????//double?currentPercentage?=?0;
????????????????????////當前已下載文件大小
????????????????????//long?currentDldBytes?=?0;
????????????????????//文件大小
????????????????????string?FtpFilePath?=?“ftp://“?+?ftpServerIP?+?“/“?+?filePath;
????????????????????long?fileLength?=?GetFileLength（FtpFilePath?ftpServerIP?ftpUserName?ftpPwd）;
????????????????????using?（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）
????????????????????????{
????????????????????????????//EDldPercentage（currentPercentage）;
????????????????????????????OutputStream.Write（buffer?0?readCount）;
????????????????????????????readCount?=?FtpStream.Read（buffer?0?bufferSize）;
????????????????????????????//currentDldBytes?+=?readCount;
????????????????????????????//currentPercentage?=?（