public List<FileInfo> GetFiles() {  string path = string.Concat(System.AppDomain.CurrentDomain.BaseDirectory,"Files//");   //獲取項目物理路徑  string[] fileType=new string[]{"pdf//","pps//","xls//"};  string[] directoryFiles = new string[] { };  List<FileInfo> fileInfoList = new List<FileInfo>();  for (int f = 0; f < fileType.Count(); f++) {   path = path + fileType[f];   directoryFiles=System.IO.Directory.GetFiles(path);  for(int d=0;d<directoryFiles.Count();d++){   FileInfo fileInfo = new FileInfo(directoryFiles[d]);   fileInfoList.Add(fileInfo);   }  }  return fileInfoList;}