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

public class FTPHelper
{
    #region 字段
    string ftpURI;
    string ftpUserID;
    string ftpServerIP;
    string ftpPassword;
    string ftpRemotePath;
    #endregion

    /// <summary> 
    /// 连接FTP服务器
    /// </summary> 
    /// <param name="FtpServerIP">FTP连接地址</param> 
    /// <param name="FtpRemotePath">指定FTP连接成功后的当前目录, 如果不指定即默认为根目录</param> 
    /// <param name="FtpUserID">用户名</param> 
    /// <param name="FtpPassword">密码</param> 
    public FTPHelper(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword)
    {
        ftpServerIP = FtpServerIP;
        ftpRemotePath = FtpRemotePath;
        ftpUserID = FtpUserID;
        ftpPassword = FtpPassword;
        ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
    }

    /// <summary> 
    /// 上传 
    /// </summary>  
    public void Upload(string filename)
    {
        FileInfo fileInf = new FileInfo(filename);
        FtpWebRequest reqFTP;
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileInf.Name));
        reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
        reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
        reqFTP.KeepAlive = false;
        reqFTP.UseBinary = true;
        reqFTP.ContentLength = fileInf.Length;
        int buffLength = 2048;
        byte[] buff = new byte[buffLength];
        int contentLen;
        FileStream fs = fileInf.OpenRead();
        try
        {
            Stream strm = reqFTP.GetRequestStream();
            contentLen = fs.Read(buff, 0, buffLength);
            while (contentLen != 0)
            {
                strm.Write(buff, 0, contentLen);
                contentLen = fs.Read(buff, 0, buffLength);
            }
            strm.Close();
            fs.Close();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
    }

    /// <summary> 
    /// 下载 
    /// </summary>  
    public void Download(string filePath, string fileName)
    {
        try
        {
            FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);
            FtpWebRequest reqFTP;
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
            reqFTP.UseBinary = true;
            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);
            while (readCount > 0)
            {
                outputStream.Write(buffer, 0, readCount);
                readCount = ftpStream.Read(buffer, 0, bufferSize);
            }
            ftpStream.Close();
            outputStream.Close();
            response.Close();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
    }

    /// <summary> 
    /// 删除文件 
    /// </summary> 
    public void Delete(string fileName)
    {
        try
        {
            FtpWebRequest reqFTP;
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
            reqFTP.KeepAlive = false;
            string result = String.Empty;
            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
            long size = response.ContentLength;
            Stream datastream = response.GetResponseStream();
            StreamReader sr = new StreamReader(datastream);
            result = sr.ReadToEnd();
            sr.Close();
            datastream.Close();
            response.Close();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
    }

    /// <summary> 
    /// 获取当前目录下明细(包含文件和文件夹) 
    /// </summary> 
    public string[] GetFilesDetailList()
    {
        try
        {
            StringBuilder result = new StringBuilder();
            FtpWebRequest ftp;
            ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
            ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
            WebResponse response = ftp.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream());
            string line = reader.ReadLine();
            line = reader.ReadLine();
            line = reader.ReadLine();
            while (line != null)
            {
                result.Append(line);
                result.Append("\n");
                line = reader.ReadLine();
            }
            result.Remove(result.ToString().LastIndexOf("\n"), 1);
            reader.Close();
            response.Close();
            return result.ToString().Split(‘\n‘);
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
    }

    /// <summary> 
    /// 获取FTP文件列表(包括文件夹)
    /// </summary>  
    private string[] GetAllList(string url)
    {
        List<string> list = new List<string>();
        FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri(url));
        req.Credentials = new NetworkCredential(ftpPassword, ftpPassword);
        req.Method = WebRequestMethods.Ftp.ListDirectory;
        req.UseBinary = true;
        req.UsePassive = true;
        try
        {
            using (FtpWebResponse res = (FtpWebResponse)req.GetResponse())
            {
                using (StreamReader sr = new StreamReader(res.GetResponseStream()))
                {
                    string s;
                    while ((s = sr.ReadLine()) != null)
                    {
                        list.Add(s);
                    }
                }
            }
        }
        catch (Exception ex)
        {
            throw (ex);
        }
        return list.ToArray();
    }

    /// <summary> 
    /// 获取当前目录下文件列表(不包括文件夹) 
    /// </summary> 
    public string[] GetFileList(string url)
    {
        StringBuilder result = new StringBuilder();
        FtpWebRequest reqFTP;
        try
        {
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
            reqFTP.UseBinary = true;
            reqFTP.Credentials = new NetworkCredential(ftpPassword, ftpPassword);
            reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
            WebResponse response = reqFTP.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream());
            string line = reader.ReadLine();
            while (line != null)
            {

                if (line.IndexOf("<DIR>") == -1)
                {
                    result.Append(Regex.Match(line, @"[\S]+ [\S]+", RegexOptions.IgnoreCase).Value.Split(‘ ‘)[1]);
                    result.Append("\n");
                }
                line = reader.ReadLine();
            }
            result.Remove(result.ToString().LastIndexOf(‘\n‘), 1);
            reader.Close();
            response.Close();
        }
        catch (Exception ex)
        {
            throw (ex);
        }
        return result.ToString().Split(‘\n‘);
    }

    /// <summary> 
    /// 判断当前目录下指定的文件是否存在 
    /// </summary> 
    /// <param name="RemoteFileName">远程文件名</param> 
    public bool FileExist(string RemoteFileName)
    {
        string[] fileList = GetFileList("*.*");
        foreach (string str in fileList)
        {
            if (str.Trim() == RemoteFileName.Trim())
            {
                return true;
            }
        }
        return false;
    }

    /// <summary> 
    /// 创建文件夹 
    /// </summary>  
    public void MakeDir(string dirName)
    {
        FtpWebRequest reqFTP;
        try
        {
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName));
            reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
            reqFTP.UseBinary = true;
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
            Stream ftpStream = response.GetResponseStream();
            ftpStream.Close();
            response.Close();
        }
        catch (Exception ex)
        { }
    }

    /// <summary> 
    /// 获取指定文件大小 
    /// </summary> 
    public long GetFileSize(string filename)
    {
        FtpWebRequest reqFTP;
        long fileSize = 0;
        try
        {
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename));
            reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
            reqFTP.UseBinary = true;
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
            Stream ftpStream = response.GetResponseStream();
            fileSize = response.ContentLength;
            ftpStream.Close();
            response.Close();
        }
        catch (Exception ex)
        { }
        return fileSize;
    }

    /// <summary> 
    /// 更改文件名 
    /// </summary>
    public void ReName(string currentFilename, string newFilename)
    {
        FtpWebRequest reqFTP;
        try
        {
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + currentFilename));
            reqFTP.Method = WebRequestMethods.Ftp.Rename;
            reqFTP.RenameTo = newFilename;
            reqFTP.UseBinary = true;
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
            Stream ftpStream = response.GetResponseStream();
            ftpStream.Close();
            response.Close();
        }
        catch (Exception ex)
        {}
    }

    /// <summary> 
    /// 移动文件 
    /// </summary> 
    public void MovieFile(string currentFilename, string newDirectory)
    {
        ReName(currentFilename, newDirectory);
    }

    /// <summary> 
    /// 切换当前目录 
    /// </summary> 
    /// <param name="IsRoot">true:绝对路径 false:相对路径</param>  
    public void GotoDirectory(string DirectoryName, bool IsRoot)
    {
        if (IsRoot)
        {
            ftpRemotePath = DirectoryName;
        }
        else
        {
            ftpRemotePath += DirectoryName + "/";
        }
        ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
    }
}

FTPHelper