C#实现树的双亲表示法

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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,aTree[] aT,int n,int pNode)
        {
            for (int i = 0; i < n; i++)
            {
                if (aT[i].pID == pNode)
                {
                    TreeNode T = new TreeNode();
                    T.Tag = aT[i].ID;
                    T.Text = aT[i].sNode;
                    pT.Nodes.Add(T);
                    cTree(T, aT, n, i);//递归
                }
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            aTree []T=new aTree[4];
            for (int i = 0; i < 4; i++)
                T[i] = new aTree();
            T[0].ID = 0; T[0].pID = -1; T[0].sNode = "A";
            T[1].ID = 1; T[1].pID = 0; T[1].sNode = "B";
            T[2].ID = 2; T[2].pID = 0; T[2].sNode = "C";
            T[3].ID = 3; T[3].pID = 2; T[3].sNode = "D";
            TreeNode TN = new TreeNode();//加入一个根结点
            TN.Tag = T[0].ID;
            TN.Text = T[0].sNode;
            cTree(TN, T, 4, 0);
            treeView1.Nodes.Clear();
            treeView1.Nodes.Add(TN);
        }
    }
}