C#实现树的双亲表示法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace 树的实现
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //构造一个双亲法表示树的类
        public class aTree
        {
            public int ID, pID;
            public string sNode;
            public aTree()
            {
                ID = pID = -1;
                sNode = "";
            }
        }
        //将双亲法表示的树转换为TreeNode类型
        public void cTree(TreeNode pT,