private Regex nameRx = new Regex(@"([\w\W]*?).(doc|docx)",RegexOptions.IgnoreCase);  private void FildDoc(string path)  {    DirectoryInfo directory = new DirectoryInfo(path);      FileSystemInfo[] fileSystemInfos = directory.GetFileSystemInfos();       foreach (FileSystemInfo filess in fileSystemInfos)       {           if (fileSystemInfo is DirectoryInfo)           {              FildDoc( path);           }           else if (fileSystemInfo is FileInfo)           {             string fileName = fileInfo.Name;             if (nameRx.Match(fileName).Success)             {              //找到word文档了；             }           }       }  }

以查找word为例，中间有些异常没有处理的，使用时要加上。