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

public class FTPHelper
{
    /// <summary>
    /// FTP请求对象
    /// </summary>
    FtpWebRequest request = null;
    /// <summary>
    /// FTP响应对象
    /// </summary>
    FtpWebResponse response = null;
    /// <summary>
    /// FTP服务器地址
    /// </summary>
    public string ftpURI { get; private set; }
    /// <summary>
    /// FTP服务器IP
    /// </summary>
    public string ftpServerIP { get; private set; }
    /// <summary>
    /// FTP服务器默认目录
    /// </summary>
    public string ftpRemotePath { get; private set; }
    /// <summary>
    /// FTP服务器登录用户名
    /// </summary>
    public string ftpUserID { get; private set; }
    /// <summary>
    /// FTP服务器登录密码
    /// </summary>
    public string ftpPassword { get; private set; }

    /// <summary>  
    /// 初始化
    /// </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)
    {
        this.ftpServerIP = ftpServerIP;
        this.ftpRemotePath = ftpRemotePath;
        this.ftpUserID = ftpUserID;
        this.ftpPassword = ftpPassword;
        this.ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
    }
    ~FTPHelper()
    {
        if (response != null)
        {
            response.Close();
            response = null;
        }
        if (request != null)
        {
            request.Abort();
            request = null;
        }
    }
    /// <summary>
    /// 建立FTP链接,返回响应对象
    /// </summary>
    /// <param name="uri">FTP地址</param>
    /// <param name="ftpMethod">操作命令</param>
    /// <returns></returns>
    private FtpWebResponse Open(Uri uri, string ftpMethod)
    {
        request = (FtpWebRequest)FtpWebRequest.Create(uri);
        request.Method = ftpMethod;
        request.UseBinary = true;
        request.KeepAlive = false;
        request.Credentials = new NetworkCredential(this.ftpUserID, this.ftpPassword);
        return (FtpWebResponse)request.GetResponse();
    }

    /// <summary>       
    /// 建立FTP链接,返回请求对象       
    /// </summary>      
    /// <param name="uri">FTP地址</param>       
    /// <param name="ftpMethod">操作命令</param>       
    private FtpWebRequest OpenRequest(Uri uri, string ftpMethod)
    {
        request = (FtpWebRequest)WebRequest.Create(uri);
        request.Method = ftpMethod;
        request.UseBinary = true;
        request.KeepAlive = false;
        request.Credentials = new NetworkCredential(this.ftpUserID, this.ftpPassword);
        return request;
    }
    /// <summary>
    /// 创建目录
    /// </summary>
    /// <param name="remoteDirectoryName">目录名</param>
    public void CreateDirectory(string remoteDirectoryName)
    {
        response = Open(new Uri(ftpURI + remoteDirectoryName), WebRequestMethods.Ftp.MakeDirectory);
    }
    /// <summary>
    /// 更改目录或文件名
    /// </summary>
    /// <param name="currentName">当前名称</param>
    /// <param name="newName">修改后新名称</param>
    public void ReName(string currentName, string newName)
    {
        request = OpenRequest(new Uri(ftpURI + currentName), WebRequestMethods.Ftp.Rename);
        request.RenameTo = newName;
        response = (FtpWebResponse)request.GetResponse();
    }   
    /// <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 + "/";
    }       
    /// <summary>
    /// 删除目录(包括下面所有子目录和子文件)
    /// </summary>
    /// <param name="remoteDirectoryName">要删除的带路径目录名：如web/test</param>
    /*
     * 例：删除test目录
     FTPHelper helper = new FTPHelper("x.x.x.x", "web", "user", "password");                  
     helper.RemoveDirectory("web/test");
     */
    public void RemoveDirectory(string remoteDirectoryName)
    {
        GotoDirectory(remoteDirectoryName, true);
        var listAll = ListFilesAndDirectories();
        foreach (var m in listAll)
        {
            if (m.IsDirectory)           
                RemoveDirectory(m.Path);           
            else           
                DeleteFile(m.Name);           
        }
        GotoDirectory(remoteDirectoryName, true);
        response = Open(new Uri(ftpURI), WebRequestMethods.Ftp.RemoveDirectory);
    }
    /// <summary>
    /// 文件上传
    /// </summary>
    /// <param name="localFilePath">本地文件路径</param>
    public void Upload(string localFilePath)
    {
        FileInfo fileInf = new FileInfo(localFilePath);
        request = OpenRequest(new Uri(ftpURI + fileInf.Name), WebRequestMethods.Ftp.UploadFile);
        request.ContentLength = fileInf.Length;
        int buffLength = 2048;
        byte[] buff = new byte[buffLength];
        int contentLen;
        using (var fs = fileInf.OpenRead())
        {
            using (var strm = request.GetRequestStream())
            {
                contentLen = fs.Read(buff, 0, buffLength);
                while (contentLen != 0)
                {
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
            }
        }
    }
    /// <summary>  
    /// 删除文件  
    /// </summary>  
    /// <param name="remoteFileName">要删除的文件名</param>
    public void DeleteFile(string remoteFileName)
    {
        response = Open(new Uri(ftpURI + remoteFileName), WebRequestMethods.Ftp.DeleteFile);
    }

    /// <summary>
    /// 获取当前目录的文件和一级子目录信息
    /// </summary>
    /// <returns></returns>
    public List<FileStruct> ListFilesAndDirectories()
    {
        var fileList = new List<FileStruct>();
        response = Open(new Uri(ftpURI), WebRequestMethods.Ftp.ListDirectoryDetails);
        using (var stream = response.GetResponseStream())
        {
            using (var sr = new StreamReader(stream))
            {
                string line = null;
                while ((line = sr.ReadLine()) != null)
                {
                    //line的格式如下：
                    //08-18-13  11:05PM       <DIR>          aspnet_client
                    //09-22-13  11:39PM                 2946 Default.aspx
                    DateTime dtDate = DateTime.ParseExact(line.Substring(0, 8), "MM-dd-yy", null);
                    DateTime dtDateTime = DateTime.Parse(dtDate.ToString("yyyy-MM-dd") + line.Substring(8, 9));
                    string[] arrs = line.Split(‘ ‘);
                    var model = new FileStruct()
                    {
                        IsDirectory = line.IndexOf("<DIR>") > 0 ? true : false,
                        CreateTime = dtDateTime,
                        Name = arrs[arrs.Length - 1],
                        Path = ftpRemotePath + "/" + arrs[arrs.Length - 1]
                    };
                    fileList.Add(model);
                }
            }
        }
        return fileList;
    }
    /// <summary>       
    /// 列出当前目录的所有文件       
    /// </summary>       
    public List<FileStruct> ListFiles()
    {
        var listAll = ListFilesAndDirectories();
        var listFile = listAll.Where(m => m.IsDirectory == false).ToList();
        return listFile;
    }
    /// <summary>       
    /// 列出当前目录的所有一级子目录       
    /// </summary>       
    public List<FileStruct> ListDirectories()
    {
        var listAll = ListFilesAndDirectories();
        var listFile = listAll.Where(m => m.IsDirectory == true).ToList();
        return listFile;
    }
    /// <summary>       
    /// 判断当前目录下指定的子目录或文件是否存在       
    /// </summary>       
    /// <param name="remoteName">指定的目录或文件名</param>      
    public bool IsExist(string remoteName)
    {
        var list = ListFilesAndDirectories();
        if (list.Count(m => m.Name == remoteName) > 0)
            return true;
        return false;
    }
    /// <summary>       
    /// 判断当前目录下指定的一级子目录是否存在       
    /// </summary>       
    /// <param name="RemoteDirectoryName">指定的目录名</param>      
    public bool IsDirectoryExist(string remoteDirectoryName)
    {
        var listDir = ListDirectories();
        if (listDir.Count(m => m.Name == remoteDirectoryName) > 0)
            return true;
        return false;
    }
    /// <summary>       
    /// 判断当前目录下指定的子文件是否存在      
    /// </summary>       
    /// <param name="RemoteFileName">远程文件名</param>       
    public bool IsFileExist(string remoteFileName)
    {
        var listFile = ListFiles();
        if (listFile.Count(m => m.Name == remoteFileName) > 0)
            return true;
        return false;
    }

    /// <summary>
    /// 下载
    /// </summary>
    /// <param name="saveFilePath">下载后的保存路径</param>
    /// <param name="downloadFileName">要下载的文件名</param>
    public void Download(string saveFilePath, string downloadFileName)
    {
        using (FileStream outputStream = new FileStream(saveFilePath + "\\" + downloadFileName, FileMode.Create))
        {
            response = Open(new Uri(ftpURI + downloadFileName), WebRequestMethods.Ftp.DownloadFile);
            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)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }
            }
        }
    }

   
}

public class FileStruct
{
    /// <summary>
    /// 是否为目录
    /// </summary>
    public bool IsDirectory { get; set; }
    /// <summary>
    /// 创建时间
    /// </summary>
    public DateTime CreateTime { get; set; }
    /// <summary>
    /// 文件或目录名称
    /// </summary>
    public string Name { get; set; }
    /// <summary>
    /// 路径
    /// </summary>
    public string Path { get; set; }
}