/// 删除文件和目录 public class Cleaner
 {
    ///    /// 删除指定目录以及该目录下所有文件    ///    /// 欲删除文件或者目录的路径
     public static void Clean ( string dir )
 {
          CleanFiles ( dir );//第一次删除文件
          CleanFiles ( dir );//第二次删除目录
     }

 private static void CleanFiles( string dir)
 {
         if ( !Directory.Exists ( dir ) ) 
         {           File.Delete ( dir );           return;
         }
         else 
    { 
      string[] dirs = Directory.GetDirectories ( dir ); 
     string[] files = Directory.GetFiles ( dir ); 

   if ( 0 != dirs.Length )      
     {        
      foreach ( string subDir in dirs )          
      {            
       if ( null == Directory.GetFiles( subDir ) )             
       {                          Directory.Delete( subDir );                 
        return;             
       }             
       else CleanFiles ( subDir );         
      }      
     }    
     if ( 0 != files.Length )           {      
      foreach ( string file in files )       
      {        
       File.Delete ( file );                }     
     }     
     else Directory.Delete( dir );    
    } 
   } }

foreach ( string subDir in dirs )          
      {            
       if ( null == Directory.GetFiles( subDir )   && subDir == "aaa.txt")             
       {                          Directory.Delete( subDir );                 
        return;             
       }             
       else CleanFiles ( subDir );         
      }