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二叉樹(shù)中序遍歷（非遞歸）

       public void MidStackOrder()
       {
           Stack<Node> stack = newStack<Node>();
           Node node = _head;

           while (node != null || stack.Count > 0)
           {
               while (node != null)
               {
                   stack.Push(node);
                   node = node.left;
               }

               if (stack.Count > 0)
               {
                   node = stack.Pop();
                   Console.WriteLine(node);
                   node = node.right;
               }
           }
       }