static void Main(string[] args)         {             //当前目录             Print(@".");             //当前目录的上一级             Print(@"..");             //注意：没有这种命令，还会返回当前目录的上一级             Print(@"...");             //上一级的上一级             Print(@"..\..");             //上一级的上一级的上一级             Print(@"..\..\..");             //上一级的上一级的上一级的上一级             Print(@"..\..\..\..");             //根目录             Print(@"\");             //根目录下的子目录             Print(@"\users");         }         static void Print(string cmd)         {             Console.WriteLine("{0}\n{1}\n", cmd, new DirectoryInfo(cmd).FullName);         }

. e:\users\mgen\documents\visual studio 2010\Projects\Mgen\Mgen\bin\Debug .. e:\users\mgen\documents\visual studio 2010\Projects\Mgen\Mgen\bin ... e:\users\mgen\documents\visual studio 2010\Projects\Mgen\Mgen\bin ..\.. e:\users\mgen\documents\visual studio 2010\Projects\Mgen\Mgen ..\..\.. e:\users\mgen\documents\visual studio 2010\Projects\Mgen ..\..\..\.. e:\users\mgen\documents\visual studio 2010\Projects \ e:\ \users e:\users