学步园

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 TEST
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            // 给目录树添加结点
            TreeNode group_animal = new TreeNode("动物");
            TreeNode subgroup_animal = new TreeNode("哺乳动物");
            TreeNode a1 = new TreeNode("小狗");
            TreeNode a2 = new TreeNode("小猪");
            TreeNode a3 = new TreeNode("小羊");
            subgroup_animal.Nodes.Add(a1);
            subgroup_animal.Nodes.Add(a2);
            subgroup_animal.Nodes.Add(a3);

            group_animal.Nodes.Add(subgroup_animal);
            TreeNode subgroup_animal2 = new TreeNode("海洋动物");
            TreeNode b1 = new TreeNode("鲨鱼");
            TreeNode b2 = new TreeNode("鲸鱼");
            TreeNode b3 = new TreeNode("泥鳅");
            subgroup_animal2.Nodes.Add(b1);
            subgroup_animal2.Nodes.Add(b2);
            subgroup_animal2.Nodes.Add(b3);

            group_animal.Nodes.Add(subgroup_animal);
            group_animal.Nodes.Add(subgroup_animal2);
            this.treeView1.Nodes.Add(group_animal);

            TreeNode goup_plant = new TreeNode("植物");
            this.treeView1.Nodes.Add(goup_plant);

            TreeNode zhongzhiwu = new TreeNode("种植物");
            TreeNode beifang = new TreeNode("北方种植物");
            TreeNode nanfang = new TreeNode("南方种植物");
            zhongzhiwu.Nodes.Add(beifang);
            zhongzhiwu.Nodes.Add(nanfang);
            goup_plant.Nodes.Add(zhongzhiwu);

            TreeNode wheet = new TreeNode("小麦");
            TreeNode corn = new TreeNode("玉米");
            beifang.Nodes.Add(wheet);
            beifang.Nodes.Add(corn);

            TreeNode rice = new TreeNode("大米");
            TreeNode ganzhe = new TreeNode("甘蔗");
            nanfang.Nodes.Add(rice);
            nanfang.Nodes.Add(ganzhe);
        }

        private void button_Click(object sender, EventArgs e)
        {
            // 递归的对TreeView进行
            //foreach (TreeNode t in treeView1.Nodes)
            //{
            //    TreeNode temp = SearchTreeNode(t, textBox1.Text);
            //    if (temp!=null)
            //    {
            //        this.treeView1.SelectedNode = temp;
            //        this.treeView1.Focus();
            //        return;
            //    }
            //}     
            TreeNode node = SearchTreeNode_2(treeView1.Nodes, textBox1.Text);
            if (node!=null)
            {
                this.treeView1.SelectedNode = node;
                this.treeView1.Focus();
            }
        }

        private TreeNode SearchTreeNode(TreeNode node, string name)
        {
            // 如果没有子节点，则返回到上一层调用
            if (node==null)
            {
                return null;
            }
            else
            {
                // 函数返回运行
                if (node.Text.ToLower().Contains(name.ToLower()))
                {
                    // 
                    return node;
                }
                TreeNode result =null;
                foreach (TreeNode t in node.Nodes)
                {
                    // 遍历所有的子节点
                    result = SearchTreeNode(t, name);
                    if (result!=null)
                    {
                        return result;
                    }
                }
                return result;
            }
        }

        private TreeNode SearchTreeNode_2(TreeNodeCollection TNC, string name)
        {
            if (TNC == null)
            {
                // 没有子节点，说明已经到树的叶子结点的后面，函数应该返回
                return null;
            }
            else
            {
                // 访问当前结点集合
                TreeNode result = null;
               foreach (TreeNode node in TNC)
               {
                   if (node.Text.ToLower().Contains(name.ToLower()))
                   {
                       result = node;
                       return result;
                   }
                   result = SearchTreeNode_2(node.Nodes, name);
                   if (result!=null)
                   {
                       return result;
                   }
               }
               return result;
            }
        }
    }
}