一个FTP客户端的C#代码

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

namespace zhangyuk.net.csdn.blog.ftpclient
{
 /// <summary>
 /// FTP Client
 /// </summary>
 public class FTPClient
 {
  #region 构造函数
  /// <summary>
  /// 缺省构造函数
  /// </summary>
  public FTPClient()
  {
   strRemoteHost  = "";
   strRemotePath  = "";
   strRemoteUser  = "";
   strRemotePass  = "";
   strRemotePort  = 21;
   bConnected     = false;
  }

  /// <summary>
  /// 构造函数
  /// </summary>
  /// <param name="remoteHost"></param>
  /// <param name="remotePath"></param>
  /// <param name="remoteUser"></param>
  /// <param name="remotePass"></param>
  /// <param name="remotePort"></param>
  public FTPClient( string remoteHost, string remotePath, string remoteUser, string remotePass, int remotePort )
  {
   strRemoteHost  = remoteHost;
   strRemotePath  = remotePath;
   strRemoteUser  = remoteUser;
   strRemotePass  = remotePass;
   strRemotePort  = remotePort;
   Connect();
  }
  #endregion

  #region 登陆
  /// <summary>
  /// FTP服务器IP地址
  /// </summary>
  private string strRemoteHost;
  public string RemoteHost
  {
   get
   {
    return strRemoteHost;
   }
   set
   {
    strRemoteHost = value;
   }
  }
  /// <summary>
  /// FTP服务器端口
  /// </summary>
  private int strRemotePort;
  public int RemotePort
  {
   get
   {
    return strRemotePort;
   }
   set
   {
    strRemotePort = value;
   }
  }
  /// <summary>
  /// 当前服务器目录
  /// </summary>
  private string strRemotePath;
  public string RemotePath
  {
   get
   {
    return strRemotePath;
   }
   set
   {
    strRemotePath = value;
   }
  }
  /// <summary>
  /// 登录用户账号
  /// </summary>
  private string strRemoteUser;
  public string RemoteUser
  {
   set
   {
    strRemoteUser = value;
   }
  }
  /// <summary>
  /// 用户登录密码
  /// </summary>
  private string strRemotePass;
  public string RemotePass
  {
   set
   {
    strRemotePass = value;
   }
  }

  /// <summary>
  /// 是否登录
  /// </summary>
  private Boolean bConnected;
  public bool Connected
  {
   get
   {
    return bConnected;
   }
  }
  #endregion

  #region 链接
  /// <summary>
  /// 建立连接 
  /// </summary>
  public void Connect()
  {
   socketControl = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
   IPEndPoint ep = new IPEndPoint(IPAddress.Parse(RemoteHost), strRemotePort);
   // 链接
   try
   {
    socketControl.Connect(ep);
   }
   catch(Exception)
   {
    throw new IOException("Couldnt connect to remote server");
   }

   // 获取应答码
   ReadReply();
   if(iReplyCode != 220)
   {
    DisConnect();
    throw new IOException(strReply.Substring(4));
   }

   // 登陆
   SendCommand("USER "+strRemoteUser);
   if( !(iReplyCode == 331 || iReplyCode == 230) )
   {
    CloseSocketConnect();//关闭连接
    throw new IOException(strReply.Substring(4));
   }
   if( iReplyCode != 230 )
   {
    SendCommand("PASS "+strRemotePass);
    if( !(iReplyCode == 230 || iReplyCode == 202) )
    {
     CloseSocketConnect();//关闭连接
     throw new IOException(strReply.Substring(4));
    }
   }
   bConnected = true;

   // 切换到目录
   ChDir(strRemotePath);
  }
    

  /// <summary>
  /// 关闭连接
  /// </summary>
  public void DisConnect()
  {
   if( socketControl != null )
   {
    SendCommand("QUIT");
   }
   CloseSocketConnect();
  }

  #endregion

  #region 传输模式

  /// <summary>
  /// 传输模式:二进制类型、ASCII类型
  /// </summary>
  public enum TransferType {Binary,ASCII};

  /// <summary>
  /// 设置传输模式
  /// </summary>
  /// <param name="ttType">传输模式</param>
  public void SetTransferType(TransferType ttType)
  {
   if(ttType == TransferType.Binary)
   {
    SendCommand("TYPE I");//binary类型传输
   }
   else
   {
    SendCommand("TYPE A");//ASCII类型传输
   }
   if (iReplyCode != 200)
   {
    throw new IOException(strReply.Substring(4));
   }
   else
   {
    trType = ttType;
   }
  }


  /// <summary>
  /// 获得传输模式
  /// </summary>
  /// <returns>传输模式</returns>
  public TransferType GetTransferType()
  {
   return trType;
  }
    
  #endregion

  #region 文件操作
  /// <summary>
  /// 获得文件列表
  /// </summary>
  /// <param name="strMask">文件名的匹配字符串</param>
  /// <returns></returns>
  public string[] Dir(string strMask)
  {
   // 建立链接
   if(!bConnected)
   {
    Connect();
   }

   //建立进行数据连接的socket
   Socket socketData = CreateDataSocket();
   
   //传送命令
   SendCommand("NLST " + strMask);

   //分析应答代码
   if(!(iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226))
   {
    throw new IOException(strReply.Substring(4));
   }

   //获得结果
   strMsg = "";
   while(true)
   {
    int iBytes = socketData.Receive(buffer, buffer.Length, 0);
  &nbs

补充：Web开发 , ASP.Net ,

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