#region 重命名文件
        ///

        /// 更改一个文件的名称或一个目录的名称
        ///

        /// 原始文件或目录名称
        /// 新的文件或目录的名称
        public bool ReName(string RemoteFileName, string NewFileName)
        {
            try
            {
                if (!IsValidFileChars(RemoteFileName) || !IsValidFileChars(NewFileName))
                {
                    throw new Exception("文件名非法！");
                }
                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！");
                }
                return true;
            }
            catch (Exception ep)
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        #endregion
        #region 拷贝、移动文件
        ///

        /// 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
        ///

        /// 当前目录下的文件名
        /// 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
        ///
        ///
        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;
            }
        }
        ///

        /// 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
        ///

        /// 当前目录下的文件名
        /// 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
        ///
        ///
        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
        ///

        /// 在FTP服务器上当前工作目录建立一个子目录
        ///

        /// 子目录名称
        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！");
                }
                Response = Open(new Uri(this.Uri.ToString() + DirectoryName), WebRequestMethods.Ftp.MakeDirectory);
                return true;
            }
            catch (Exception ep)
            {
                ErrorMsg = ep.ToString();
                throw ep;
            }
        }
        ///

        /// 从当前工作目录中删除一个子目录
        ///

        /// 子目录名称
        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
        ///

        /// 判断目录名中字符是否合法
        ///

        /// 目录名称
        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;
        }
        ///

        /// 判断文件名中字符是否合法
        ///

        /// 文件名称
        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
        ///

        /// 进入一个目录
        ///

        ///
        /// 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
        ///
        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;
            }
        }
        ///

        /// 从当前工作目录进入一个子目录
        ///

        /// 子目录名称
        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;
            }
        }
        ///

        /// 从当前工作目录往上一级目录
        ///

        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