指定一个文件夹，读取文件夹中的指定后缀

private   void   getDirectories(string   path)  
  {  
  string[]   fileNames   =   Directory.GetFiles("D:","*.asf");  
  string[]   directories   =   Directory.GetDirectories(path);  
  foreach   (string   file   in   fileNames)  
  {  
  Console.WriteLine("Filename:{0}",file);  
  }  
  foreach   (string   dir   in   directories)  
  {  
  Console.WriteLine("Directoriesname:{0}",dir);  
  getDirectories(dir);  
  }  
  }