调用: ListFiles(new DirectoryInfo(source));  /// 
        /// //递归遍历所有文件包括子文件夹下的文件 并对word excel pdf文件进行复制到目标路径        /// 
        ///         private void ListFiles(FileSystemInfo info)        {            if (!info.Exists) { return; }            DirectoryInfo dir = info as DirectoryInfo;            //不是目录             if (dir == null) { return; }            FileSystemInfo[] files = dir.GetFileSystemInfos();            for (int i = 0; i < files.Length; i++)            {                FileInfo file = files[i] as FileInfo;                //是文件                 if (file != null)                {                    string[] arr = file.Name.Split(new char[] { '.' });                    arr[arr.Length - 1] = arr[arr.Length - 1].ToLower();                    if (arr[arr.Length - 1] == "doc" || arr[arr.Length - 1] == "docx")                    {                                            #region 每扫描到一个word文件 存储到lst里面去                        FilesModelRepostory fileModel = new FilesModelRepostory();                        fileModel.ID = Guid.NewGuid().ToString("N");                        fileModel.FileName = file.Name;                        fileModel.FileType =FileType.Word;                                                AddJob(fileModel);                        #endregion                        count++;                    }                    if (arr[arr.Length - 1] == "xls" || arr[arr.Length - 1] == "xlsx")                    {                                               #region 每扫描到一个Excel文件 存储到lst里面去                        FilesModelRepostory fileModel = new FilesModelRepostory();                        fileModel.ID = Guid.NewGuid().ToString("N");                        fileModel.FileName = file.Name;                        fileModel.FileType = FileType.Excel;                        AddJob(fileModel);                        #endregion                        count++;                    }                    if (arr[arr.Length - 1] == "pdf")                    {                                            #region 每扫描到一个pdf文件 存储到lst里面去                        FilesModelRepostory fileModel = new FilesModelRepostory();                        fileModel.ID = Guid.NewGuid().ToString("N");                        fileModel.FileName = file.Name;                        fileModel.FileType =FileType.Pdf;                        AddJob(fileModel);                        #endregion                        count++;                    }                }                //对于子目录，进行递归调用                 else                {                    ListFiles(files[i]);                }            }        }