class Class1
    {
        [STAThread]
        static void Main(string[] args)
        {
            //初始化链表
            LineNote startnote = new LineNote( "1" );
            LineNote note = startnote;
            for( int i = 2; i<= 5 ;i ++ )
            {
                note.Next = new LineNote( i.ToString() );
                note = note.Next;
            }
            note = startnote;
            //输出
            while ( note!=null )
            {
                System.Console.WriteLine( note.Note );
                note = note.Next;
            }
            //开始反转
            note = startnote;
            LineNote temp = note;
            while ( temp != null )
            {
                note = startnote;
                if ( temp != startnote )
                {
                    startnote = temp;
                    temp = temp.Next;
                    startnote.Next = note;
                }
                else
                {
                    temp = temp.Next;
                    note.Next= null;
                }
            }
            再次输出
            note = startnote;
            while ( note!=null )
            {
                System.Console.WriteLine( note.Note );
                note = note.Next;
            }
        }
    }

    class LineNote
    {
        public string Note;
        public LineNote Next;
        public LineNote( string note)
        {
            Note=note;
        }
    }

很有趣的练习:）