来源：https://www.cnblogs.com/mrtester/p/11676168.html
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
//**new namespace
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Resources;
using System.Text.RegularExpressions;
using System.Collections;
namespace crFTP
{
///
/// FTP类
///
public class FTP
{
#region 变量声明
///
/// 服务器连接地址
///
public string server;
///
/// 登陆帐号
///
public string user;
///
/// 登陆口令
///
public string pass;
///
/// 端口号
///
public int port;
///
/// 无响应时间（FTP在指定时间内无响应）
///
public int timeout;
///
/// 服务器错误状态信息
///
public string errormessage;
///
/// 服务器状态返回信息
///
private string messages;
///
/// 服务器的响应信息
///
private string responseStr;
///
/// 链接模式（主动或被动，默认为被动）
///
private bool passive_mode;
///
/// 上传或下载信息字节数
///
private long bytes_total;
///
/// 上传或下载的文件大小
///
private long file_size;
///
/// 主套接字
///
private Socket main_sock;
///
/// 要链接的网络地址终结点
///
private IPEndPoint main_ipEndPoint;
///
/// 侦听套接字
///
private Socket listening_sock;
///
/// 数据套接字
///
private Socket data_sock;
///
/// 要链接的网络数据地址终结点
///
private IPEndPoint data_ipEndPoint;
///
/// 用于上传或下载的文件流对象
///
private FileStream file;
///
/// 与FTP服务器交互的状态值
///
private int response;
///
/// 读取并保存当前命令执行后从FTP服务器端返回的数据信息
///
private string bucket;
#endregion
#region 构造函数
///
/// 构造函数
///
public FTP()
{
server = null;
user = null;
pass = null;
port = 21;
passive_mode = true;
main_sock = null;
main_ipEndPoint = null;
listening_sock = null;
data_sock = null;
data_ipEndPoint = null;
file = null;
bucket = "";
bytes_total = 0;
timeout = 10000; //无响应时间为10秒
messages = "";
errormessage = "";
}
///
/// 构造函数
///
/// 服务器IP或名称
/// 登陆帐号
/// 登陆口令
public FTP(string server, string user, string pass)
{
this.server = server;
this.user = user;
this.pass = pass;
port = 21;
passive_mode = true;
main_sock = null;
main_ipEndPoint = null;
listening_sock = null;
data_sock = null;
data_ipEndPoint = null;
file = null;
bucket = "";
bytes_total = 0;
timeout = 10000; //无响应时间为10秒
messages = "";
errormessage = "";
}
///
/// 构造函数
///
/// 服务器IP或名称
/// 端口号
/// 登陆帐号
/// 登陆口令
public FTP(string server, int port, string user, string pass)
{
this.server = server;
this.user = user;
this.pass = pass;
this.port = port;
passive_mode = true;
main_sock = null;
main_ipEndPoint = null;
listening_sock = null;
data_sock = null;
data_ipEndPoint = null;
file = null;
bucket = "";
bytes_total = 0;
timeout = 10000; //无响应时间为10秒
messages = "";
errormessage = "";
}
///
/// 构造函数
///
/// 服务器IP或名称
/// 端口号
/// 登陆帐号
/// 登陆口令
/// 链接方式
public FTP(string server, int port, string user, string pass, int mode)
{
this.server = server;
this.user = user;
this.pass = pass;
this.port = port;
passive_mode = mode
/// 构造函数
///
/// 服务器IP或名称
/// 端口号
/// 登陆帐号
/// 登陆口令
/// 链接方式
/// 无响应时间(限时),单位:秒 (小于或等于0为不受时间限制)
public FTP(string server, int port, string user, string pass, int mode, int timeout_sec)
{
this.server = server;
this.user = user;
this.pass = pass;
this.port = port;
passive_mode = mode
/// 当前是否已连接
///
public bool IsConnected
{
get
{
if (main_sock != null)
return main_sock.Connected;
return false;
}
}
///
/// 当message缓冲区有数据则返回
///
public bool MessagesAvailable
{
get
{
if (messages.Length > 0)
return true;
return false;
}
}
///
/// 获取服务器状态返回信息, 并清空messages变量
///
public string Messages
{
get
{
string tmp = messages;
messages = "";
return tmp;
}
}
///
/// 最新指令发出后服务器的响应
///
public string ResponseString
{
get
{
return responseStr;
}
}
///
///在一次传输中,发送或接收的字节数
///
public long BytesTotal
{
get
{
return bytes_total;
}
}
///
///被下载或上传的文件大小,当文件大小无效时为0
///
public long FileSize
{
get
{
return file_size;
}
}
///
/// 链接模式:
/// true 被动模式 [默认]
/// false: 主动模式
///
public bool PassiveMode
{
get
{
return passive_mode;
}
set
{
passive_mode = value;
}
}
#endregion
#region 操作
///
/// 操作失败
///
private void Fail()
{
Disconnect();
errormessage += responseStr;
//throw new Exception(responseStr);
}
///
/// 下载文件类型
///
/// true:二进制文件 false:字符文件
private void SetBinaryMode(bool mode)
{
if (mode)
SendCommand("TYPE I");
else
SendCommand("TYPE A");
ReadResponse();
if (response != 200)
Fail();
}
///
/// 发送命令
///
///
private void SendCommand(string command)
{
Byte[] cmd = Encoding.ASCII.GetBytes((command + "\r\n").ToCharArray());
if (command.Length > 3 && command.Substring(0, 4) == "PASS")
{
messages = "\rPASS xxx";
}
else
{
messages = "\r" + command;
}
try
{
main_sock.Send(cmd, cmd.Length, 0);
}
catch (Exception ex)
{
try
{
Disconnect();
errormessage += ex.Message;
return;
}
catch
{
main_sock.Close();
file.Close();
main_sock = null;
main_ipEndPoint = null;
file = null;
}
}
}
private void FillBucket()
{
Byte[] bytes = new Byte[512];
long bytesgot;
int msecs_passed = 0;
while (main_sock.Available timeout)
{
Disconnect();
errormessage += "Timed out waiting on server to respond.";
return;
}
}
while (main_sock.Available > 0)
{
bytesgot = main_sock.Receive(bytes, 512, 0);
bucket += Encoding.ASCII.GetString(bytes, 0, (int)bytesgot);
System.Threading.Thread.Sleep(50);
}
}
private string GetLineFromBucket()
{
int i;
string buf = "";
if ((i = bucket.IndexOf('\n'))
/// 返回服务器端返回信息
///
private void ReadResponse()
{
string buf;
messages = "";
while (true)
{
buf = GetLineFromBucket();
if (Regex.Match(buf, "^[0-9]+ ").Success)
{
responseStr = buf;
response = int.Parse(buf.Substring(0, 3));
break;
}
else
messages += Regex.Replace(buf, "^[0-9]+-", "") + "\n";
}
}
///
/// 打开数据套接字
///
private void OpenDataSocket()
{
if (passive_mode)
{
string[] pasv;
string server;
int port;
Connect();
SendCommand("PASV");
ReadResponse();
if (response != 227)
Fail();
try
{
int i1, i2;
i1 = responseStr.IndexOf('(') + 1;
i2 = responseStr.IndexOf(')') - i1;
pasv = responseStr.Substring(i1, i2).Split(',');
}
catch (Exception)
{
Disconnect();
errormessage += "Malformed PASV response: " + responseStr;
return;
}
if (pasv.Length
/// 关闭所有链接
///
public void Disconnect()
{
CloseDataSocket();
if (main_sock != null)
{
if (main_sock.Connected)
{
SendCommand("QUIT");
main_sock.Close();
}
main_sock = null;
}
if (file != null)
file.Close();
main_ipEndPoint = null;
file = null;
}
///
/// 链接到FTP服务器
///
/// 要链接的IP地址或主机名
/// 端口号
/// 登陆帐号
/// 登陆口令
public void Connect(string server, int port, string user, string pass)
{
this.server = server;
this.user = user;
this.pass = pass;
this.port = port;
Connect();
}
///
/// 链接到FTP服务器
///
/// 要链接的IP地址或主机名
/// 登陆帐号
/// 登陆口令
public void Connect(string server, string user, string pass)
{
this.server = server;
this.user = user;
this.pass = pass;
Connect();
}
///
/// 链接到FTP服务器
///
public bool Connect()
{
if (server == null)
{
errormessage += "No server has been set.\r\n";
}
if (user == null)
{
errormessage += "No server has been set.\r\n";
}
if (main_sock != null)
if (main_sock.Connected)
return true;
try
{
main_sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//#if NET1
main_ipEndPoint = new IPEndPoint(Dns.GetHostByName(server).AddressList[0], port);
//#else
// main_ipEndPoint = new IPEndPoint(System.Net.Dns.GetHostEntry(server).AddressList[0], port);
//#endif
main_sock.Connect(main_ipEndPoint);
}
catch (Exception ex)
{
errormessage += ex.Message;
return false;
}
ReadResponse();
if (response != 220)
Fail();
SendCommand("USER " + user);
ReadResponse();
switch (response)
{
case 331:
if (pass == null)
{
Disconnect();
errormessage += "No password has been set.";
return false;
}
SendCommand("PASS " + pass);
ReadResponse();
if (response != 230)
{
Fail();
return false;
}
break;
case 230:
break;
}
return true;
}
///
/// 获取FTP当前(工作)目录下的文件列表
///
/// 返回文件列表数组
public ArrayList List()
{
Byte[] bytes = new Byte[512];
string file_list = "";
long bytesgot = 0;
int msecs_passed = 0;
ArrayList list = new ArrayList();
Connect();
OpenDataSocket();
SendCommand("LIST");
ReadResponse();
switch (response)
{
case 125:
case 150:
break;
default:
CloseDataSocket();
throw new Exception(responseStr);
}
ConnectDataSocket();
while (data_sock.Available (timeout / 10))
{
break;
}
}
while (data_sock.Available > 0)
{
bytesgot = data_sock.Receive(bytes, bytes.Length, 0);
file_list += Encoding.ASCII.GetString(bytes, 0, (int)bytesgot);
System.Threading.Thread.Sleep(50);
}
CloseDataSocket();
ReadResponse();
if (response != 226)
throw new Exception(responseStr);
foreach (string f in file_list.Split('\n'))
{
if (f.Length > 0 && !Regex.Match(f, "^total").Success)
list.Add(f.Substring(0, f.Length - 1));
}
return list;
}
///
/// 获取到文件名列表
///
/// 返回文件名列表
public ArrayList ListFiles()
{
ArrayList list = new ArrayList();
foreach (string f in List())
{
if ((f.Length > 0))
{
if ((f[0] != 'd') && (f.ToUpper().IndexOf("")
/// 获取路径列表
///
/// 返回路径列表
public ArrayList ListDirectories()
{
ArrayList list = new ArrayList();
foreach (string f in List())
{
if (f.Length > 0)
{
if ((f[0] == 'd') || (f.ToUpper().IndexOf("") >= 0))
list.Add(f);
}
}
return list;
}
///
/// 获取原始数据信息.
///
/// 远程文件名
/// 返回原始数据信息.
public string GetFileDateRaw(string fileName)
{
Connect();
SendCommand("MDTM " + fileName);
ReadResponse();
if (response != 213)
{
errormessage += responseStr;
return "";
}
return (this.responseStr.Substring(4));
}
///
/// 得到文件日期.
///
/// 远程文件名
/// 返回远程文件日期
public DateTime GetFileDate(string fileName)
{
return ConvertFTPDateToDateTime(GetFileDateRaw(fileName));
}
private DateTime ConvertFTPDateToDateTime(string input)
{
if (input.Length
/// 获取FTP上的当前(工作)路径
///
/// 返回FTP上的当前(工作)路径
public string GetWorkingDirectory()
{
//PWD - 显示工作路径
Connect();
SendCommand("PWD");
ReadResponse();
if (response != 257)
{
errormessage += responseStr;
}
string pwd;
try
{
pwd = responseStr.Substring(responseStr.IndexOf("\"", 0) + 1);//5);
pwd = pwd.Substring(0, pwd.LastIndexOf("\""));
pwd = pwd.Replace("\"\"", "\""); // 替换带引号的路径信息符号
}
catch (Exception ex)
{
errormessage += ex.Message;
return null;
}
return pwd;
}
///
/// 跳转服务器上的当前(工作)路径
///
/// 要跳转的路径
public bool ChangeDir(string path)
{
Connect();
SendCommand("CWD " + path);
ReadResponse();
if (response != 250)
{
errormessage += responseStr;
return false;
}
return true;
}
///
/// 创建指定的目录
///
/// 要创建的目录
public void MakeDir(string dir)
{
Connect();
SendCommand("MKD " + dir);
ReadResponse();
switch (response)
{
case 257:
case 250:
break;
default:
{
errormessage += responseStr;
break;
}
}
}
///
/// 移除FTP上的指定目录
///
/// 要移除的目录
public void RemoveDir(string dir)
{
Connect();
SendCommand("RMD " + dir);
ReadResponse();
if (response != 250)
{
errormessage += responseStr;
return;
;
}
}
///
/// 移除FTP上的指定文件
///
/// 要移除的文件名称
public void RemoveFile(string filename)
{
Connect();
SendCommand("DELE " + filename);
ReadResponse();
if (response != 250)
{
errormessage += responseStr;
}
}
///
/// 重命名FTP上的文件
///
/// 原文件名
/// 新文件名
public void RenameFile(string oldfilename, string newfilename)
{
Connect();
SendCommand("RNFR " + oldfilename);
ReadResponse();
if (response != 350)
{
errormessage += responseStr;
}
else
{
SendCommand("RNTO " + newfilename);
ReadResponse();
if (response != 250)
{
errormessage += responseStr;
}
}
}
///
/// 获得指定文件的大小(如果FTP支持)
///
/// 指定的文件
/// 返回指定文件的大小
public long GetFileSize(string filename)
{
Connect();
SendCommand("SIZE " + filename);
ReadResponse();
if (response != 213)
{
errormessage += responseStr;
}
return Int64.Parse(responseStr.Substring(4));
}
///
/// 上传指定的文件
///
/// 要上传的文件
public bool OpenUpload(string filename)
{
return OpenUpload(filename, filename, false);
}
///
/// 上传指定的文件
///
/// 本地文件名
/// 远程要覆盖的文件名
public bool OpenUpload(string filename, string remotefilename)
{
return OpenUpload(filename, remotefilename, false);
}
///
/// 上传指定的文件
///
/// 本地文件名
/// 如果存在,则尝试恢复
public bool OpenUpload(string filename, bool resume)
{
return OpenUpload(filename, filename, resume);
}
///
/// 上传指定的文件
///
/// 本地文件名
/// 远程要覆盖的文件名
/// 如果存在,则尝试恢复
public bool OpenUpload(string filename, string remote_filename, bool resume)
{
Connect();
SetBinaryMode(true);
OpenDataSocket();
bytes_total = 0;
try
{
file = new FileStream(filename, FileMode.Open);
}
catch (Exception ex)
{
file = null;
errormessage += ex.Message;
return false;
}
file_size = file.Length;
if (resume)
{
long size = GetFileSize(remote_filename);
SendCommand("REST " + size);
ReadResponse();
if (response == 350)
file.Seek(size, SeekOrigin.Begin);
}
SendCommand("STOR " + remote_filename);
ReadResponse();
switch (response)
{
case 125:
case 150:
break;
default:
file.Close();
file = null;
errormessage += responseStr;
return false;
}
ConnectDataSocket();
return true;
}
///
/// 下载指定文件
///
/// 远程文件名称
public void OpenDownload(string filename)
{
OpenDownload(filename, filename, false);
}
///
/// 下载并恢复指定文件
///
/// 远程文件名称
/// 如文件存在,则尝试恢复
public void OpenDownload(string filename, bool resume)
{
OpenDownload(filename, filename, resume);
}
///
/// 下载指定文件
///
/// 远程文件名称
/// 本地文件名
public void OpenDownload(string remote_filename, string localfilename)
{
OpenDownload(remote_filename, localfilename, false);
}
///
/// 打开并下载文件
///
/// 远程文件名称
/// 本地文件名
/// 如果文件存在则恢复
public void OpenDownload(string remote_filename, string local_filename, bool resume)
{
Connect();
SetBinaryMode(true);
bytes_total = 0;
try
{
file_size = GetFileSize(remote_filename);
}
catch
{
file_size = 0;
}
if (resume && File.Exists(local_filename))
{
try
{
file = new FileStream(local_filename, FileMode.Open);
}
catch (Exception ex)
{
file = null;
throw new Exception(ex.Message);
}
SendCommand("REST " + file.Length);
ReadResponse();
if (response != 350)
throw new Exception(responseStr);
file.Seek(file.Length, SeekOrigin.Begin);
bytes_total = file.Length;
}
else
{
try
{
file = new FileStream(local_filename, FileMode.Create);
}
catch (Exception ex)
{
file = null;
throw new Exception(ex.Message);
}
}
OpenDataSocket();
SendCommand("RETR " + remote_filename);
ReadResponse();
switch (response)
{
case 125:
case 150:
break;
default:
file.Close();
file = null;
errormessage += responseStr;
return;
}
ConnectDataSocket();
return;
}
///
/// 上传文件(循环调用直到上传完毕)
///
/// 发送的字节数
public long DoUpload()
{
Byte[] bytes = new Byte[512];
long bytes_got;
try
{
bytes_got = file.Read(bytes, 0, bytes.Length);
bytes_total += bytes_got;
data_sock.Send(bytes, (int)bytes_got, 0);
if (bytes_got
/// 下载文件(循环调用直到下载完毕)
///
/// 接收到的字节点
public long DoDownload()
{
Byte[] bytes = new Byte[512];
long bytes_got;
try
{
bytes_got = data_sock.Receive(bytes, bytes.Length, 0);
if (bytes_got