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


namespace DSWeb.EntityDA
{    
    /// <summary>
    /// FTP处理操作类
    /// 功能：
    /// 下载文件
    /// 上传文件
    /// 上传文件的进度信息
    /// 下载文件的进度信息
    /// 删除文件
    /// 列出文件
    /// 列出目录
    /// 进入子目录
    /// 退出当前目录返回上一层目录
    /// 判断远程文件是否存在
    /// 判断远程文件是否存在
    /// 删除远程文件   
    /// 建立目录
    /// 删除目录
    /// 文件（目录）改名
    #region 文件信息结构
    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 FTPDA
    {
        #region 属性信息
        /// <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>
        private Uri _Uri;
        /// <summary>
        /// FTP服务器地址
        /// </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 地址格式错误!" );
                    ErrorMsg = "Ftp 地址格式错误！";
                    return;
                }
                _Uri = new Uri( value.GetLeftPart( UriPartial.Authority ) );
                _DirectoryPath = value.AbsolutePath;
                if( !_DirectoryPath.EndsWith( "/" ) )
                {
                    _DirectoryPath += "/";
                }
            }
        }
 
        /// <summary>
        /// 当前工作目录
        /// </summary>
        private string _DirectoryPath;
 
        /// <summary>
        /// 当前工作目录
        /// </summary>
        public string DirectoryPath
        {
            get
            {
                return _DirectoryPath;
            }
            set
            {
                _DirectoryPath = value;
            }
        }
 
        /// <summary>
        /// FTP登录用户
        /// </summary>
        private string _UserName;
        /// <summary>
        /// FTP登录用户
        /// </summary>
        public string UserName
        {
            get
            {
                return _UserName;
            }
            set
            {
                _UserName = value;
            }
        }
 
        /// <summary>
        /// 错误信息
        /// </summary>
        private string _ErrorMsg;
        /// <summary>
        /// 错误信息
        /// </summary>
        public string ErrorMsg
        {
            get
            {
                return _ErrorMsg;
            }
            set
            {
                _ErrorMsg = value;
            }
        }
 
        /// <summary>
        /// FTP登录密码
        /// </summary>
        private string _Password;
        /// <summary>
        /// FTP登录密码
        /// </summary>
        public string Password
        {
            get
            {
                return _Password;
            }
            set
            {
                _Password = value;
            }
        }
 
        /// <summary>
        /// 连接FTP服务器的代理服务
        /// </summary>
        private WebProxy _Proxy = null;
        /// <summary>
        /// 连接FTP服务器的代理服务
        /// </summary>
        public WebProxy Proxy
        {
            get
            {
                return _Proxy;
            }
            set
            {
                _Proxy = value;
            }
        }
 
        /// <summary>
        /// 是否需要删除临时文件
        /// </summary>
        private bool _isDeleteTempFile = false;
        /// <summary>
        /// 异步上传所临时生成的文件
        /// </summary>
        private string _UploadTempFile = "";
        #endregion

        #region 事件
        public delegate void De_DownloadProgressChanged( object sender, DownloadProgressChangedEventArgs e );
        public delegate void De_DownloadDataCompleted( object sender, System.ComponentModel.AsyncCompletedEventArgs e );
        public delegate void De_UploadProgressChanged( object sender, UploadProgressChangedEventArgs e );
        public delegate void De_UploadFileCompleted( object sender, UploadFileCompletedEventArgs e );
 
        /// <summary>
        /// 异步下载进度发生改变触发的事件
        /// </summary>
        public event De_DownloadProgressChanged DownloadProgressChanged;
        /// <summary>
        /// 异步下载文件完成之后触发的事件
        /// </summary>
        public event De_DownloadDataCompleted DownloadDataCompleted;
        /// <summary>
        /// 异步上传进度发生改变触发的事件
        /// </summary>
        public event De_UploadProgressChanged UploadProgressChanged;
        /// <summary>
        /// 异步上传文件完成之后触发的事件
        /// </summary>
        public event De_UploadFileCompleted UploadFileCompleted;
        #endregion

        #region 构造析构函数
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="FtpUri">FTP地址</param>
        /// <param name="strUserName">登录用户名</param>
        /// <param name="strPassword">登录密码</param>
        public FTPDA( Uri FtpUri, string strUserName, string strPassword )
        {
            this._Uri = new Uri( FtpUri.GetLeftPart( UriPartial.Authority ) );
            _DirectoryPath = FtpUri.AbsolutePath;
            if( !_DirectoryPath.EndsWith( "/" ) )
            {
                _DirectoryPath += "/";
            }
            this._UserName = strUserName;
            this._Password = strPassword;
            this._Proxy = null;
        }
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="FtpUri">FTP地址</param>
        /// <param name="strUserName">登录用户名</param>
        /// <param name="strPassword">登录密码</param>
        /// <param name="objProxy">连接代理</param>
        public FTPDA( Uri FtpUri, string strUserName, string strPassword, WebProxy objProxy )
        {
            this._Uri = new Uri( FtpUri.GetLeftPart( UriPartial.Authority ) );
            _DirectoryPath = FtpUri.AbsolutePath;
            if( !_DirectoryPath.EndsWith( "/" ) )
            {
                _DirectoryPath += "/";
            }
            this._UserName = strUserName;
            this._Password = strPassword;
            this._Proxy = objProxy;
        }
        /// <summary>
        /// 构造函数
        /// </summary>
        public FTPDA()
        {
            this._UserName = "anonymous";  //匿名用户
            this._Password = "@anonymous";
            this._Uri = null;
            this._Proxy = null;
        }
 
        /// <summary>
        /// 析构函数
        /// </summary>
        ~FTPDA()
        {
            if( Response != null )
            {
                Response.Close();
                Response = null;
            }
            if( Request != null )
            {
                Request.Abort();
                Request = null;
            }
        }
        #endregion

        #region 建立连接
        /// <summary>
        /// 建立FTP链接,返回响应对象
        /// </summary>
        /// <param name="uri">FTP地址</param>
        /// <param name="FtpMathod">操作命令</param>
        private FtpWebResponse Open( Uri uri, string FtpMathod )
        {
            try
            {
                Request = ( FtpWebRequest ) WebRequest.Create( uri );
                Request.Method = FtpMathod;
                Request.UseBinary = true;
                Request.Credentials = new NetworkCredential( this.UserName, this.Password );
                if( this.Proxy != null )
                {
                    Request.Proxy = this.Proxy;
                }
                return ( FtpWebResponse ) Request.GetResponse();
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                return (FtpWebResponse)Request.GetResponse();
                //throw ep;
            }
        }
        /// <summary>
        /// 建立FTP链接,返回请求对象
        /// </summary>
        /// <param name="uri">FTP地址</param>
        /// <param name="FtpMathod">操作命令</param>
        private FtpWebRequest OpenRequest( Uri uri, string FtpMathod )
        {
            try
            {
                Request = ( FtpWebRequest ) WebRequest.Create( uri );
                Request.Method = FtpMathod;
                Request.UseBinary = true;
                Request.Credentials = new NetworkCredential( this.UserName, this.Password );
                if( this.Proxy != null )
                {
                    Request.Proxy = this.Proxy;
                }
                return Request;
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        #endregion

        #region 下载文件 
        /// <summary>
        /// 从FTP服务器下载文件，使用与远程文件同名的文件名来保存文件
        /// </summary>
        /// <param name="RemoteFileName">远程文件名</param>
        /// <param name="LocalPath">本地路径</param> 
        public bool DownloadFile( string RemoteFileName, string LocalPath )
        {
            return DownloadFile( RemoteFileName, LocalPath, RemoteFileName );
        }
        /// <summary>
        /// 从FTP服务器下载文件，指定本地路径和本地文件名
        /// </summary>
        /// <param name="RemoteFileName">远程文件名</param>
        /// <param name="LocalPath">本地路径</param>
        /// <param name="LocalFilePath">保存文件的本地路径,后面带有""</param>
        /// <param name="LocalFileName">保存本地的文件名</param>
        public bool DownloadFile( string RemoteFileName, string LocalPath, string LocalFileName )
        {
            byte[] bt = null;
            try
            {
                if( !IsValidFileChars( RemoteFileName ) || !IsValidFileChars( LocalFileName ) || !IsValidPathChars( LocalPath ) )
                {
                    throw new Exception( "非法文件名或目录名!" );
                }
                if( !Directory.Exists( LocalPath ) )
                {
                    throw new Exception( "本地文件路径不存在!" );
                }
 
                string LocalFullPath = Path.Combine( LocalPath, LocalFileName );
                if( File.Exists( LocalFullPath ) )
                {
                    throw new Exception( "当前路径下已经存在同名文件！" );
                }
                bt = DownloadFile( RemoteFileName );
                if( bt != null )
                {
                    FileStream stream = new FileStream( LocalFullPath, FileMode.Create );
                    stream.Write( bt, 0, bt.Length );
                    stream.Flush();
                    stream.Close();
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
 
        /// <summary>
        /// 从FTP服务器下载文件，返回文件二进制数据
        /// </summary>
        /// <param name="RemoteFileName">远程文件名</param>
        public byte[] DownloadFile( string RemoteFileName )
        {
            try
            {
                if( !IsValidFileChars( RemoteFileName ) )
                {
                    throw new Exception( "非法文件名或目录名!" );
                }
                Response = Open( new Uri( this.Uri.ToString() + RemoteFileName ), WebRequestMethods.Ftp.DownloadFile );
                Stream Reader = Response.GetResponseStream();
 
                MemoryStream mem = new MemoryStream( 1024 * 500 );
                byte[] buffer = new byte[ 1024 ];
                int bytesRead = 0;
                int TotalByteRead = 0;
                while( true )
                {
                    bytesRead = Reader.Read( buffer, 0, buffer.Length );
                    TotalByteRead += bytesRead;
                    if( bytesRead == 0 )
                        break;
                    mem.Write( buffer, 0, bytesRead );
                }
                if( mem.Length > 0 )
                {
                    return mem.ToArray();
                }
                else
                {
                    return null;
                }
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        #endregion
        #region 异步下载文件
        /// <summary>
        /// 从FTP服务器异步下载文件，指定本地路径和本地文件名
        /// </summary>
        /// <param name="RemoteFileName">远程文件名</param>       
        /// <param name="LocalPath">保存文件的本地路径,后面带有""</param>
        /// <param name="LocalFileName">保存本地的文件名</param>
        public void DownloadFileAsync( string RemoteFileName, string LocalPath, string LocalFileName )
        {
            try
            {
                if( !IsValidFileChars( RemoteFileName ) || !IsValidFileChars( LocalFileName ) || !IsValidPathChars( LocalPath ) )
                {
                    throw new Exception( "非法文件名或目录名!" );
                }
                if( !Directory.Exists( LocalPath ) )
                {
                    throw new Exception( "本地文件路径不存在!" );
                }
 
                string LocalFullPath = Path.Combine( LocalPath, LocalFileName );
                if( File.Exists( LocalFullPath ) )
                {
                    throw new Exception( "当前路径下已经存在同名文件！" );
                }
                DownloadFileAsync( RemoteFileName, LocalFullPath ); 
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
 
        /// <summary>
        /// 从FTP服务器异步下载文件，指定本地完整路径文件名
        /// </summary>
        /// <param name="RemoteFileName">远程文件名</param>
        /// <param name="LocalFullPath">本地完整路径文件名</param>
        public void DownloadFileAsync( string RemoteFileName, string LocalFullPath )
        {
            try
            {
                if( !IsValidFileChars( RemoteFileName ) )
                {
                    throw new Exception( "非法文件名或目录名!" );
                }
                if( File.Exists( LocalFullPath ) )
                {
                    throw new Exception( "当前路径下已经存在同名文件！" );
                }
                MyWebClient client = new MyWebClient();
 
                client.DownloadProgressChanged += new DownloadProgressChangedEventHandler( client_DownloadProgressChanged );
                client.DownloadFileCompleted += new System.ComponentModel.AsyncCompletedEventHandler( client_DownloadFileCompleted );
                client.Credentials = new NetworkCredential( this.UserName, this.Password );
                if( this.Proxy != null )
                {
                    client.Proxy = this.Proxy;
                }
                client.DownloadFileAsync( new Uri( this.Uri.ToString() + RemoteFileName ), LocalFullPath );
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
 
        /// <summary>
        /// 异步下载文件完成之后触发的事件
        /// </summary>
        /// <param name="sender">下载对象</param>
        /// <param name="e">数据信息对象</param>
        void client_DownloadFileCompleted( object sender, System.ComponentModel.AsyncCompletedEventArgs e )
        {
            if( DownloadDataCompleted != null )
            {
                DownloadDataCompleted( sender, e );
            }
        }
 
        /// <summary>
        /// 异步下载进度发生改变触发的事件
        /// </summary>
        /// <param name="sender">下载对象</param>
        /// <param name="e">进度信息对象</param>
        void client_DownloadProgressChanged( object sender, DownloadProgressChangedEventArgs e )
        {
            if( DownloadProgressChanged != null )
            {
                DownloadProgressChanged( sender, e );
            }
        }
        #endregion
        #region 上传文件
        /// <summary>
        /// 上传文件到FTP服务器
        /// </summary>
        /// <param name="LocalFullPath">本地带有完整路径的文件名</param>
        public bool UploadFile( string LocalFullPath )
        {
            return UploadFile( LocalFullPath, Path.GetFileName( LocalFullPath ), false );
        }
        /// <summary>
        /// 上传文件到FTP服务器
        /// </summary>
        /// <param name="LocalFullPath">本地带有完整路径的文件</param>
        /// <param name="OverWriteRemoteFile">是否覆盖远程服务器上面同名的文件</param>
        public bool UploadFile( string LocalFullPath, bool OverWriteRemoteFile )
        {
            return UploadFile( LocalFullPath, Path.GetFileName( LocalFullPath ), OverWriteRemoteFile );
        }
        /// <summary>
        /// 上传文件到FTP服务器
        /// </summary>
        /// <param name="LocalFullPath">本地带有完整路径的文件</param>
        /// <param name="RemoteFileName">要在FTP服务器上面保存文件名</param>
        public bool UploadFile( string LocalFullPath, string RemoteFileName )
        {
            return UploadFile( LocalFullPath, RemoteFileName, false );
        }
        /// <summary>
        /// 上传文件到FTP服务器
        /// </summary>
        /// <param name="LocalFullPath">本地带有完整路径的文件名</param>
        /// <param name="RemoteFileName">要在FTP服务器上面保存文件名</param>
        /// <param name="OverWriteRemoteFile">是否覆盖远程服务器上面同名的文件</param>
        public bool UploadFile( string LocalFullPath, string RemoteFileName, bool OverWriteRemoteFile )
        {
            try
            {
                if( !IsValidFileChars( RemoteFileName ) || !IsValidFileChars( Path.GetFileName( LocalFullPath ) ) || !IsValidPathChars( Path.GetDirectoryName( LocalFullPath ) ) )
                {
                    //throw new Exception("非法文件名或目录名!");
                    ErrorMsg = "非法文件名或目录名！";
                    return false;
                }
                if( File.Exists( LocalFullPath ) )
                {
                    FileStream Stream = new FileStream( LocalFullPath, FileMode.Open, FileAccess.Read );
                    byte[] bt = new byte[ Stream.Length ];
                    Stream.Read( bt, 0, ( Int32 ) Stream.Length );   //注意，因为Int32的最大限制，最大上传文件只能是大约2G多一点
                    Stream.Close();
                    return UploadFile( bt, RemoteFileName, OverWriteRemoteFile );
                }
                else
                {
                    //throw new Exception("本地文件不存在!");
                    ErrorMsg = "本地文件不存在！";
                    return false;
                }
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        /// <summary>
        /// 上传文件到FTP服务器
        /// </summary>
        /// <param name="FileBytes">上传的二进制数据</param>
        /// <param name="RemoteFileName">要在FTP服务器上面保存文件名</param>
        public bool UploadFile( byte[] FileBytes, string RemoteFileName )
        {
            if( !IsValidFileChars( RemoteFileName ) )
            {
                throw new Exception( "非法文件名或目录名!" );
            }
            return UploadFile( FileBytes, RemoteFileName, false );
        }
        /// <summary>
        /// 上传文件到FTP服务器
        /// </summary>
        /// <param name="FileBytes">文件二进制内容</param>
        /// <param name="RemoteFileName">要在FTP服务器上面保存文件名</param>
        /// <param name="OverWriteRemoteFile">是否覆盖远程服务器上面同名的文件</param>
        public bool UploadFile( byte[] FileBytes, string RemoteFileName, bool OverWriteRemoteFile )
        {
            try
            {
                if( !IsValidFileChars( RemoteFileName ) )
                {
                    //throw new Exception("非法文件名！");
                    ErrorMsg = "非法文件名！";
                    return false;
                }
                if( !OverWriteRemoteFile && FileExist( RemoteFileName ) )
                {
                    //throw new Exception("FTP服务上面已经存在同名文件！");
                    ErrorMsg = "FTP服务上面已经存在同名文件！";
                    return false;
                }
                Response = Open( new Uri( this.Uri.ToString() + RemoteFileName ), WebRequestMethods.Ftp.UploadFile );
                Stream requestStream = Request.GetRequestStream();
                MemoryStream mem = new MemoryStream( FileBytes );
 
                byte[] buffer = new byte[ 1024 ];
                int bytesRead = 0;
                int TotalRead = 0;
                while( true )
                {
                    bytesRead = mem.Read( buffer, 0, buffer.Length );
                    if( bytesRead == 0 )
                        break;
                    TotalRead += bytesRead;
                    requestStream.Write( buffer, 0, bytesRead );
                }
                requestStream.Close();
                Response = ( FtpWebResponse ) Request.GetResponse();
                mem.Close();
                mem.Dispose();
                FileBytes = null;
                return true;
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        #endregion
        #region 异步上传文件
        /// <summary>
        /// 异步上传文件到FTP服务器
        /// </summary>
        /// <param name="LocalFullPath">本地带有完整路径的文件名</param>
        public void UploadFileAsync( string LocalFullPath )
        {
            UploadFileAsync( LocalFullPath, Path.GetFileName( LocalFullPath ), false );
        }
        /// <summary>
        /// 异步上传文件到FTP服务器
        /// </summary>
        /// <param name="LocalFullPath">本地带有完整路径的文件</param>
        /// <param name="OverWriteRemoteFile">是否覆盖远程服务器上面同名的文件</param>
        public void UploadFileAsync( string LocalFullPath, bool OverWriteRemoteFile )
        {
            UploadFileAsync( LocalFullPath, Path.GetFileName( LocalFullPath ), OverWriteRemoteFile );
        }
        /// <summary>
        /// 异步上传文件到FTP服务器
        /// </summary>
        /// <param name="LocalFullPath">本地带有完整路径的文件</param>
        /// <param name="RemoteFileName">要在FTP服务器上面保存文件名</param>
        public void UploadFileAsync( string LocalFullPath, string RemoteFileName )
        {
            UploadFileAsync( LocalFullPath, RemoteFileName, false );
        }
        /// <summary>
        /// 异步上传文件到FTP服务器
        /// </summary>
        /// <param name="LocalFullPath">本地带有完整路径的文件名</param>
        /// <param name="RemoteFileName">要在FTP服务器上面保存文件名</param>
        /// <param name="OverWriteRemoteFile">是否覆盖远程服务器上面同名的文件</param>
        public void UploadFileAsync( string LocalFullPath, string RemoteFileName, bool OverWriteRemoteFile )
        {
            try
            {
                if( !IsValidFileChars( RemoteFileName ) || !IsValidFileChars( Path.GetFileName( LocalFullPath ) ) || !IsValidPathChars( Path.GetDirectoryName( LocalFullPath ) ) )
                {
                    throw new Exception( "非法文件名或目录名!" );
                }
                if( !OverWriteRemoteFile && FileExist( RemoteFileName ) )
                {
                    throw new Exception( "FTP服务上面已经存在同名文件！" );
                }
                if( File.Exists( LocalFullPath ) )
                {
                    MyWebClient client = new MyWebClient();
 
                    client.UploadProgressChanged += new UploadProgressChangedEventHandler( client_UploadProgressChanged );
                    client.UploadFileCompleted += new UploadFileCompletedEventHandler( client_UploadFileCompleted );
                    client.Credentials = new NetworkCredential( this.UserName, this.Password );
                    if( this.Proxy != null )
                    {
                        client.Proxy = this.Proxy;
                    }
                    client.UploadFileAsync( new Uri( this.Uri.ToString() + RemoteFileName ), LocalFullPath );
 
                }
                else
                {
                    throw new Exception( "本地文件不存在!" );
                }
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        /// <summary>
        /// 异步上传文件到FTP服务器
        /// </summary>
        /// <param name="FileBytes">上传的二进制数据</param>
        /// <param name="RemoteFileName">要在FTP服务器上面保存文件名</param>
        public void UploadFileAsync( byte[] FileBytes, string RemoteFileName )
        {
            if( !IsValidFileChars( RemoteFileName ) )
            {
                throw new Exception( "非法文件名或目录名!" );
            }
            UploadFileAsync( FileBytes, RemoteFileName, false );
        }
        /// <summary>
        /// 异步上传文件到FTP服务器
        /// </summary>
        /// <param name="FileBytes">文件二进制内容</param>
        /// <param name="RemoteFileName">要在FTP服务器上面保存文件名</param>
        /// <param name="OverWriteRemoteFile">是否覆盖远程服务器上面同名的文件</param>
        public void UploadFileAsync( byte[] FileBytes, string RemoteFileName, bool OverWriteRemoteFile )
        {
            try
            {
 
                if( !IsValidFileChars( RemoteFileName ) )
                {
                    throw new Exception( "非法文件名！" );
                }
                if( !OverWriteRemoteFile && FileExist( RemoteFileName ) )
                {
                    throw new Exception( "FTP服务上面已经存在同名文件！" );
                }
                string TempPath = System.Environment.GetFolderPath( Environment.SpecialFolder.Templates );
                if( !TempPath.EndsWith( "/" ) )
                {
                    TempPath += "/";
                }
                string TempFile = TempPath + Path.GetRandomFileName();
                TempFile = Path.ChangeExtension( TempFile, Path.GetExtension( RemoteFileName ) );
                FileStream Stream = new FileStream( TempFile, FileMode.CreateNew, FileAccess.Write );
                Stream.Write( FileBytes, 0, FileBytes.Length );   //注意，因为Int32的最大限制，最大上传文件只能是大约2G多一点
                Stream.Flush();
                Stream.Close();
                Stream.Dispose();
                _isDeleteTempFile = true;
                _UploadTempFile = TempFile;
                FileBytes = null;
                UploadFileAsync( TempFile, RemoteFileName, OverWriteRemoteFile );
 
 
 
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
 
        /// <summary>
        /// 异步上传文件完成之后触发的事件
        /// </summary>
        /// <param name="sender">下载对象</param>
        /// <param name="e">数据信息对象</param>
        void client_UploadFileCompleted( object sender, UploadFileCompletedEventArgs e )
        {
            if( _isDeleteTempFile )
            {
                if( File.Exists( _UploadTempFile ) )
                {
                    File.SetAttributes( _UploadTempFile, FileAttributes.Normal );
                    File.Delete( _UploadTempFile );
                }
                _isDeleteTempFile = false;
            }
            if( UploadFileCompleted != null )
            {
                UploadFileCompleted( sender, e );
            }
        }
 
        /// <summary>
        /// 异步上传进度发生改变触发的事件
        /// </summary>
        /// <param name="sender">下载对象</param>
        /// <param name="e">进度信息对象</param>
        void client_UploadProgressChanged( object sender, UploadProgressChangedEventArgs e )
        {
            if( UploadProgressChanged != null )
            {
                UploadProgressChanged( sender, e );
            }
        }
        #endregion
        #region 列出目录文件信息
        /// <summary>
        /// 列出FTP服务器上面当前目录的所有文件和目录
        /// </summary>
        public FileStruct[] ListFilesAndDirectories()
        {
            Response = Open( this.Uri, WebRequestMethods.Ftp.ListDirectoryDetails );
            StreamReader stream = new StreamReader(Response.GetResponseStream());//, Encoding.Default );
            string Datastring = stream.ReadToEnd();
            FileStruct[] list = GetList( Datastring );
            return list;
        }
        /// <summary>
        /// 列出FTP服务器上面当前目录的所有文件
        /// </summary>
        public FileStruct[] ListFiles()
        {
            FileStruct[] listAll = ListFilesAndDirectories();
            List<FileStruct> listFile = new List<FileStruct>();
            foreach( FileStruct file in listAll )
            {
                if( !file.IsDirectory )
                {
                    listFile.Add( file );
                }
            }
            return listFile.ToArray();
        }
 
        /// <summary>
        /// 列出FTP服务器上面当前目录的所有的目录
        /// </summary>
        public FileStruct[] ListDirectories()
        {
            FileStruct[] listAll = ListFilesAndDirectories();
            List<FileStruct> listDirectory = new List<FileStruct>();
            foreach( FileStruct file in listAll )
            {
                if( file.IsDirectory )
                {
                    listDirectory.Add( file );
                }
            }
            return listDirectory.ToArray();
        }
        /// <summary>
        /// 获得文件和目录列表
        /// </summary>
        /// <param name="datastring">FTP返回的列表字符信息</param>
        private FileStruct[] GetList( string datastring )
        {
            List<FileStruct> myListArray = new List<FileStruct>();
            //string[] dataRecords = datastring.Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries); 
            string[] dataRecords = datastring.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries); 
            FileListStyle _directoryListStyle = GuessFileListStyle(dataRecords);
            foreach( string s in dataRecords )
            {
                if( _directoryListStyle != FileListStyle.Unknown && s != "" )
                {
                    FileStruct f = new FileStruct();
                    f.Name = "..";
                    switch( _directoryListStyle )
                    {
                        case FileListStyle.UnixStyle:
                            f = ParseFileStructFromUnixStyleRecord( s );
                            break;
                        case FileListStyle.WindowsStyle:
                            f = ParseFileStructFromWindowsStyleRecord( s );
                            break;
                    }
                    if( !( f.Name == "." || f.Name == ".." ) )
                    {
                        myListArray.Add( f );
                    }
                }
            }
            return myListArray.ToArray();
        }
 
        /// <summary>
        /// 从Windows格式中返回文件信息
        /// </summary>
        /// <param name="Record">文件信息</param>
        private FileStruct ParseFileStructFromWindowsStyleRecord( string Record )
        {
            FileStruct f = new FileStruct();
            string processstr = Record.Trim();
            string dateStr = processstr.Substring( 0, 8 );
            processstr = ( processstr.Substring( 8, processstr.Length - 8 ) ).Trim();
            string timeStr = processstr.Substring( 0, 7 );
            processstr = ( processstr.Substring( 7, processstr.Length - 7 ) ).Trim();
            DateTimeFormatInfo myDTFI = new CultureInfo( "en-US", false ).DateTimeFormat;
            myDTFI.ShortTimePattern = "t";
            f.CreateTime = DateTime.Parse( dateStr + " " + timeStr, myDTFI );
            if( processstr.Substring( 0, 5 ) == "<DIR>" )
            {
                f.IsDirectory = true;
                processstr = ( processstr.Substring( 5, processstr.Length - 5 ) ).Trim();
            }
            else
            {
                string[] strs = processstr.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);   // true);
                processstr = strs[ 1 ];
                f.IsDirectory = false;
            }
            f.Name = processstr;
            return f;
        }
 
 
        /// <summary>
        /// 判断文件列表的方式Window方式还是Unix方式
        /// </summary>
        /// <param name="recordList">文件信息列表</param>
        private FileListStyle GuessFileListStyle( string[] recordList )
        {
            foreach( string s in recordList )
            {
                if( s.Length > 10
                 && Regex.IsMatch( s.Substring( 0, 10 ), "(-|d)(-|r)(-|w)(-|x)(-|r)(-|w)(-|x)(-|r)(-|w)(-|x)" ) )
                {
                    return FileListStyle.UnixStyle;
                }
                else if( s.Length > 8
                 && Regex.IsMatch( s.Substring( 0, 8 ), "[0-9][0-9]-[0-9][0-9]-[0-9][0-9]" ) )
                {
                    return FileListStyle.WindowsStyle;
                }
            }
            return FileListStyle.Unknown;
        }
 
        /// <summary>
        /// 从Unix格式中返回文件信息
        /// </summary>
        /// <param name="Record">文件信息</param>
        private FileStruct ParseFileStructFromUnixStyleRecord( string Record )
        {
            FileStruct f = new FileStruct();
            string processstr = Record.Trim();
            f.Flags = processstr.Substring( 0, 10 );
            f.IsDirectory = ( f.Flags[ 0 ] == 'd' );
            processstr = ( processstr.Substring( 11 ) ).Trim();
            _cutSubstringFromStringWithTrim( ref processstr, ' ', 0 );   //跳过一部分
            f.Owner = _cutSubstringFromStringWithTrim( ref processstr, ' ', 0 );
            f.Group = _cutSubstringFromStringWithTrim( ref processstr, ' ', 0 );
            _cutSubstringFromStringWithTrim( ref processstr, ' ', 0 );   //跳过一部分
            string yearOrTime = processstr.Split( new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries )[ 2 ];
            if( yearOrTime.IndexOf( ":" ) >= 0 )  //time
            {
                processstr = processstr.Replace( yearOrTime, DateTime.Now.Year.ToString() );
            }
            f.CreateTime = DateTime.Parse( _cutSubstringFromStringWithTrim( ref processstr, ' ', 8 ) );
            f.Name = processstr;   //最后就是名称
            return f;
        }
 
        /// <summary>
        /// 按照一定的规则进行字符串截取
        /// </summary>
        /// <param name="s">截取的字符串</param>
        /// <param name="c">查找的字符</param>
        /// <param name="startIndex">查找的位置</param>
        private string _cutSubstringFromStringWithTrim( ref string s, char c, int startIndex )
        {
            int pos1 = s.IndexOf( c, startIndex );
            string retString = s.Substring( 0, pos1 );
            s = ( s.Substring( pos1 ) ).Trim();
            return retString;
        }
        #endregion
        #region 目录或文件存在的判断
        /// <summary>
        /// 判断当前目录下指定的子目录是否存在
        /// </summary>
        /// <param name="RemoteDirectoryName">指定的目录名</param>
        public bool DirectoryExist( string RemoteDirectoryName )
        {
            try
            {
                if( !IsValidPathChars( RemoteDirectoryName ) )
                {
                    throw new Exception( "目录名非法！" );
                }
                FileStruct[] listDir = ListDirectories();
                foreach( FileStruct dir in listDir )
                {
                    if( dir.Name == RemoteDirectoryName )
                    {
                        return true;
                    }
                }
                return false;
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        /// <summary>
        /// 判断一个远程文件是否存在服务器当前目录下面
        /// </summary>
        /// <param name="RemoteFileName">远程文件名</param>
        public bool FileExist( string RemoteFileName )
        {
            try
            {
                if( !IsValidFileChars( RemoteFileName ) )
                {
                    //throw new Exception("文件名非法！");
                    ErrorMsg = "文件名非法！";
                    return false;
                }
                FileStruct[] listFile = ListFiles();
                foreach( FileStruct file in listFile )
                {
                    if( file.Name == RemoteFileName )
                    {
                        return true;
                    }
                }
                return false;
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        #endregion
        #region 删除文件
        /// <summary>
        /// 从FTP服务器上面删除一个文件
        /// </summary>
        /// <param name="RemoteFileName">远程文件名</param>
        public void DeleteFile( string RemoteFileName )
        {
            try
            {
                if( !IsValidFileChars( RemoteFileName ) )
                {
                    //throw new Exception( "文件名非法！" );
                    ErrorMsg = "文件名非法！";
                }
                Response = Open( new Uri( this.Uri.ToString() + RemoteFileName ), WebRequestMethods.Ftp.DeleteFile );
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                //throw ep;
            }
        }
        #endregion
        #region 重命名文件
        /// <summary>
        /// 更改一个文件的名称或一个目录的名称
        /// </summary>
        /// <param name="RemoteFileName">原始文件或目录名称</param>
        /// <param name="NewFileName">新的文件或目录的名称</param>
        public bool ReName( string RemoteFileName, string NewFileName )
        {
            try
            {
                if( !IsValidFileChars( RemoteFileName ) || !IsValidFileChars( NewFileName ) )
                {
                    //throw new Exception("文件名非法！");
                    ErrorMsg = "文件名非法！";
                    return false;
                }
                if( RemoteFileName == NewFileName )
                {
                    return true;
                }
                if( FileExist( RemoteFileName ) )
                {
                    Request = OpenRequest( new Uri( this.Uri.ToString() + RemoteFileName ), WebRequestMethods.Ftp.Rename );
                    Request.RenameTo = NewFileName;
                    Response = ( FtpWebResponse ) Request.GetResponse(); 
                }
                else
                {
                    //throw new Exception("文件在服务器上不存在！");
                    ErrorMsg = "文件在服务器上不存在！";
                    return false;
                }
                return true;
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        #endregion
        #region 拷贝、移动文件
        /// <summary>
        /// 把当前目录下面的一个文件拷贝到服务器上面另外的目录中，注意，拷贝文件之后，当前工作目录还是文件原来所在的目录
        /// </summary>
        /// <param name="RemoteFile">当前目录下的文件名</param>
        /// <param name="DirectoryName">新目录名称。
        /// 说明：如果新目录是当前目录的子目录，则直接指定子目录。如: SubDirectory1/SubDirectory2 ；
        /// 如果新目录不是当前目录的子目录，则必须从根目录一级一级的指定。如： ./NewDirectory/SubDirectory1/SubDirectory2
        /// </param>
        /// <returns></returns>
        public bool CopyFileToAnotherDirectory( string RemoteFile, string DirectoryName )
        {
            string CurrentWorkDir = this.DirectoryPath;
            try
            {
                byte[] bt = DownloadFile( RemoteFile );
                GotoDirectory( DirectoryName );
                bool Success = UploadFile( bt, RemoteFile, false );
                this.DirectoryPath = CurrentWorkDir;
                return Success;
            }
            catch( Exception ep )
            {
                this.DirectoryPath = CurrentWorkDir;
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        /// <summary>
        /// 把当前目录下面的一个文件移动到服务器上面另外的目录中，注意，移动文件之后，当前工作目录还是文件原来所在的目录
        /// </summary>
        /// <param name="RemoteFile">当前目录下的文件名</param>
        /// <param name="DirectoryName">新目录名称。
        /// 说明：如果新目录是当前目录的子目录，则直接指定子目录。如: SubDirectory1/SubDirectory2 ；
        /// 如果新目录不是当前目录的子目录，则必须从根目录一级一级的指定。如： ./NewDirectory/SubDirectory1/SubDirectory2
        /// </param>
        /// <returns></returns>
        public bool MoveFileToAnotherDirectory( string RemoteFile, string DirectoryName )
        {
            string CurrentWorkDir = this.DirectoryPath;
            try
            {
                if( DirectoryName == "" )
                    return false;
                if( !DirectoryName.StartsWith( "/" ) )
                    DirectoryName = "/" + DirectoryName;
                if( !DirectoryName.EndsWith( "/" ) )
                    DirectoryName += "/";
                bool Success = ReName( RemoteFile, DirectoryName + RemoteFile );
                this.DirectoryPath = CurrentWorkDir;
                return Success;
            }
            catch( Exception ep )
            {
                this.DirectoryPath = CurrentWorkDir;
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        #endregion
        #region 建立、删除子目录
        /// <summary>
        /// 在FTP服务器上当前工作目录建立一个子目录
        /// </summary>
        /// <param name="DirectoryName">子目录名称</param>
        public bool MakeDirectory( string DirectoryName )
        {
            try
            {
                if( !IsValidPathChars( DirectoryName ) )
                {
                    throw new Exception( "目录名非法！" );
                }
                if( DirectoryExist( DirectoryName ) )
                {
                    throw new Exception( "服务器上面已经存在同名的文件名或目录名！" );
                }
                string a = this.Uri.ToString();
                string b = DirectoryName;
                Response = Open( new Uri( this.Uri.ToString() + DirectoryName ), WebRequestMethods.Ftp.MakeDirectory );
                return true;
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        /// <summary>
        /// 从当前工作目录中删除一个子目录
        /// </summary>
        /// <param name="DirectoryName">子目录名称</param>
        public bool RemoveDirectory( string DirectoryName )
        {
            try
            {
                if( !IsValidPathChars( DirectoryName ) )
                {
                    throw new Exception( "目录名非法！" );
                }
                if( !DirectoryExist( DirectoryName ) )
                {
                    throw new Exception( "服务器上面不存在指定的文件名或目录名！" );
                }
                Response = Open( new Uri( this.Uri.ToString() + DirectoryName ), WebRequestMethods.Ftp.RemoveDirectory );
                return true;
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        #endregion
        #region 文件、目录名称有效性判断
        /// <summary>
        /// 判断目录名中字符是否合法
        /// </summary>
        /// <param name="DirectoryName">目录名称</param>
        public bool IsValidPathChars( string DirectoryName )
        {
            char[] invalidPathChars = Path.GetInvalidPathChars();
            char[] DirChar = DirectoryName.ToCharArray();
            foreach( char C in DirChar )
            {
                if( Array.BinarySearch( invalidPathChars, C ) >= 0 )
                {
                    return false;
                }
            }
            return true;
        }
        /// <summary>
        /// 判断文件名中字符是否合法
        /// </summary>
        /// <param name="FileName">文件名称</param>
        public bool IsValidFileChars( string FileName )
        {
            char[] invalidFileChars = Path.GetInvalidFileNameChars();
            char[] NameChar = FileName.ToCharArray();
            foreach( char C in NameChar )
            {
                if( Array.BinarySearch( invalidFileChars, C ) >= 0 )
                {
                    return false;
                }
            }
            return true;
        }
        #endregion
        #region 目录切换操作
        /// <summary>
        /// 进入一个目录
        /// </summary>
        /// <param name="DirectoryName">
        /// 新目录的名字。
        /// 说明：如果新目录是当前目录的子目录，则直接指定子目录。如: SubDirectory1/SubDirectory2 ；
        /// 如果新目录不是当前目录的子目录，则必须从根目录一级一级的指定。如： ./NewDirectory/SubDirectory1/SubDirectory2
        /// </param>
        public bool GotoDirectory( string DirectoryName )
        {
            string CurrentWorkPath = this.DirectoryPath;
            try
            {
                DirectoryName = DirectoryName.Replace( "/", "/" );
                string[] DirectoryNames = DirectoryName.Split( new char[] { '/' } );
                if( DirectoryNames[ 0 ] == "." )
                {
                    this.DirectoryPath = "/";
                    if( DirectoryNames.Length == 1 )
                    {
                        return true;
                    }
                    Array.Clear( DirectoryNames, 0, 1 );
                }
                bool Success = false;
                foreach( string dir in DirectoryNames )
                {
                    if( dir != null )
                    {
                        Success = EnterOneSubDirectory( dir );
                        if( !Success )
                        {
                            this.DirectoryPath = CurrentWorkPath;
                            return false;
                        }
                    }
                }
                return Success;
 
            }
            catch( Exception ep )
            {
                this.DirectoryPath = CurrentWorkPath;
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        /// <summary>
        /// 从当前工作目录进入一个子目录
        /// </summary>
        /// <param name="DirectoryName">子目录名称</param>
        private bool EnterOneSubDirectory( string DirectoryName )
        {
            try
            {
                if( DirectoryName.IndexOf( "/" ) >= 0 || !IsValidPathChars( DirectoryName ) )
                {
                    throw new Exception( "目录名非法!" );
                }
                if( DirectoryName.Length > 0 && DirectoryExist( DirectoryName ) )
                {
                    if( !DirectoryName.EndsWith( "/" ) )
                    {
                        DirectoryName += "/";
                    }
                    _DirectoryPath += DirectoryName;
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch( Exception ep )
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        /// <summary>
        /// 从当前工作目录往上一级目录
        /// </summary>
        public bool ComeoutDirectory()
        {
            if( _DirectoryPath == "/" )
            {
                ErrorMsg = "当前目录已经是根目录！";
                throw new Exception( "当前目录已经是根目录！" );
            }
            char[] sp = new char[ 1 ] { '/' };
 
            string[] strDir = _DirectoryPath.Split( sp, StringSplitOptions.RemoveEmptyEntries );
            if( strDir.Length == 1 )
            {
                _DirectoryPath = "/";
            }
            else
            {
                _DirectoryPath = String.Join( "/", strDir, 0, strDir.Length - 1 );
            }
            return true;
 
        }
        #endregion
        #region 重载WebClient，支持FTP进度
        internal class MyWebClient : WebClient
        {
            protected override WebRequest GetWebRequest( Uri address )
            {
                FtpWebRequest req = ( FtpWebRequest ) base.GetWebRequest( address );
                req.UsePassive = false;
                return req;
            }
        }
        #endregion
    }
}