C#实现二叉树基本操作，排序，计算和文件读写

此系统设计整合了二叉树基本操作，二叉树排序，二叉树计算和文件读写四个功能。

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

namespace TreeApp
{
    public partial class Form1 : Form
    {
        Form2 form2 = new Form2（）;
        Form3 form3 = new Form3（）;
        Form4 form4 = new Form4（）;
        Form5 form5 = new Form5（）;
        Form6 form6 = new Form6（）;
        Form7 form7 = new Form7（）;
        Tree tree = new Tree（）;
        public Form1（）
        {
            InitializeComponent（）;
        }

        private void button_insert_Click（object sender EventArgs e）//插入操作
        {
            
            int key=0;
            double value=0;
            form2.ShowDialog（）;
            if （form2.bl==true）
            {
                key = Convert.ToInt32（form2.textBox_number.Text.ToString（））;
                value = Convert.ToDouble（form2.textBox_value.Text.ToString（））;
                tree.insert（key value）;
                form2.bl = false;
            }
            
            //if（form2.button_yes.Select（））
            //tree.insert（form2.textBox_number form2.textBox_value）;
        }



        private void button_delete_Click（object sender EventArgs e）//删除操作
        {
            int key = 0;
            form3.ShowDialog（）;
            if（form3.bl==true）
            {
                key = Convert.ToInt32（form3.textBox_number.Text.ToString（））;
                tree.delete（key）;
                listView1.Items.Clear（）;
                preOrder1（tree.root）;
                form3.bl=false;
            }
            
            
        }

        private void button_find_Click（object sender EventArgs e）//查找操作
        {
            int key = 0;
            form4.ShowDialog（）;
            if （ form4.bl==true）
            {
                key = Convert.ToInt32（form4.textBox_number.Text.ToString（））;
                Node found= tree.find（key）;
                if （found != null）
                {
                    form5.textBox_number.Text = Convert.ToString（found.iData）;
                    form5.textBox_value.Text = Convert.ToString（found.dData）;
                    if （form5.ShowDialog（） == DialogResult.OK） ;
                }
                form4.bl = false;
            }
            
            


        }

        private void listView1_SelectedIndexChanged（object sender EventArgs e）
        {

        }

        private void button_output_Click（object sender EventArgs e）//输出操作
        {
           // System.Windows.Forms.ListViewItem listviewitem;
            listView1.Items.Clear（）;
            preOrder1（tree.root）;
         /*   for （int i = 0; i < tree.k; i++）
            {

                String number value;
                number = Convert.ToString（tree.number[i]）;
                value = Convert.ToString（tree.value[i]）;
                listviewitem = new Li

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        910  2008-07-05 20:56  TreeApp\TreeApp.sln

    ..A..H.     38912  2008-11-01 08:59  TreeApp\TreeApp.suo

     文件      18053  2008-07-10 23:16  TreeApp\TreeApp\Form1.cs

     文件      16751  2008-07-08 01:36  TreeApp\TreeApp\Form1.Designer.cs

     文件       5814  2008-07-08 01:36  TreeApp\TreeApp\Form1.resx

     文件        692  2008-07-07 10:29  TreeApp\TreeApp\Form2.cs

     文件       4462  2008-07-07 10:22  TreeApp\TreeApp\Form2.Designer.cs

     文件       5814  2008-07-07 10:22  TreeApp\TreeApp\Form2.resx

     文件        481  2008-07-07 10:37  TreeApp\TreeApp\Form3.cs

     文件       3199  2008-07-07 10:37  TreeApp\TreeApp\Form3.Designer.cs

     文件       5814  2008-07-07 10:37  TreeApp\TreeApp\Form3.resx

     文件        584  2008-07-07 10:44  TreeApp\TreeApp\Form4.cs

     文件       3306  2008-07-07 10:44  TreeApp\TreeApp\Form4.Designer.cs

     文件       5814  2008-07-07 10:44  TreeApp\TreeApp\Form4.resx

     文件        425  2008-07-07 19:01  TreeApp\TreeApp\Form5.cs

     文件       4182  2008-07-07 19:01  TreeApp\TreeApp\Form5.Designer.cs

     文件       5814  2008-07-07 19:01  TreeApp\TreeApp\Form5.resx

     文件        335  2008-07-07 02:46  TreeApp\TreeApp\Form6.cs

     文件       4138  2008-07-07 02:46  TreeApp\TreeApp\Form6.Designer.cs

     文件       5814  2008-07-07 02:46  TreeApp\TreeApp\Form6.resx

     文件        335  2008-07-07 02:46  TreeApp\TreeApp\Form7.cs

     文件       2599  2008-07-07 02:46  TreeApp\TreeApp\Form7.Designer.cs

     文件       5814  2008-07-07 02:46  TreeApp\TreeApp\Form7.resx

     文件        466  2008-07-05 20:56  TreeApp\TreeApp\Program.cs

     文件       6483  2008-07-10 23:35  TreeApp\TreeApp\TreeApp.csproj

     文件        536  2008-07-10 23:35  TreeApp\TreeApp\TreeApp.csproj.user

     文件       1652  2008-07-10 23:34  TreeApp\TreeApp\TreeApp_TemporaryKey.pfx

     文件       1186  2008-07-05 20:56  TreeApp\TreeApp\Properties\AssemblyInfo.cs

     文件       2868  2008-07-05 20:56  TreeApp\TreeApp\Properties\Resources.Designer.cs

     文件       5612  2008-07-05 20:56  TreeApp\TreeApp\Properties\Resources.resx

............此处省略43个文件信息