FTP操作類

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

namespace System.Net.Ftp
{
    /// <summary>
    /// FTP處理操作類
    /// 功能：
    /// 下載文件
    /// 上傳文件
    /// 上傳文件的進度信息
    /// 下載文件的進度信息
    /// 刪除文件
    /// 列出文件
    /// 列出目錄
    /// 進入子目錄
    /// 退出當前目錄返回上一層目錄
    /// 判斷遠程文件是否存在
    /// 判斷遠程文件是否存在
    /// 刪除遠程文件   
    /// 建立目錄
    /// 刪除目錄
    /// 文件（目錄）改名
    /// </summary>
  
    #region 文件信息結構
    public struct FileStruct
    {
        public string Flags;
        public string Owner;
        public string Group;
        public bool IsDirectory;
        public DateTime CreateTime;
        public string Name;
    }
    public enum FileListStyle
    {
        UnixStyle,
        WindowsStyle,
        Unknown
    }
    #endregion
    public class clsFTP
    {
        #region 屬性信息
        /// <summary>
        /// FTP請求對象
        /// </summary>
        FtpWebRequest Request = null;
        /// <summary>
        /// FTP響應對象
        /// </summary>
        FtpWebResponse Response = null;
        /// <summary>
        /// FTP服務器地址
        /// </summary>
        private Uri _Uri;
        /// <summary>
        /// FTP服務器地址
        /// </summary>
        public Uri Uri
        {
            get
            {
                if (_DirectoryPath == "/")
                {
                    return _Uri;
                }
                else
                {
                    string strUri = _Uri.ToString();
                    if (strUri.EndsWith("/"))
                    {
                        strUri = strUri.Substring(0, strUri.Length - 1);
                    }
                    return new Uri(strUri + this.DirectoryPath);
                }
            }
            set
            {
                if (value.Scheme != Uri.UriSchemeFtp)
                {
                    throw new Exception("Ftp 地址格式錯誤!");
                }
                _Uri = new Uri(value.GetLeftPart(UriPartial.Authority));
                _DirectoryPath = value.AbsolutePath;
                if (!_DirectoryPath.EndsWith("/"))
                {
                    _DirectoryPath += "/";
                }
            }
        }

        /// <summary>
        /// 當前工作目錄
        /// </summary>
        private string _DirectoryPath;

        /// <summary>
        /// 當前工作目錄
        /// </summary>
        public string DirectoryPath
        {
            get { return _DirectoryPath; }
            set { _DirectoryPath = value; }
        }

        /// <summary>
        /// FTP登錄用戶
        /// </summary>
 &n