staticvoidMain(string[]args)  {  nodesrootNode=BinTree();  Console.WriteLine("先序遍历方法遍历二叉树:");  PreOrder(rootNode);  Console.WriteLine("中序遍历方法遍历二叉树:");  MidOrder(rootNode);  Console.WriteLine("后序遍历方法遍历二叉树:");  AfterOrder(rootNode);