设计一个Windows应用程序，定义一个Teacher类，包含姓名和职称两个字段和一个输出自己信息的方法，并用ArrayList实现与实例6-1相同的功能。

设计一个Windows应用程序，定义一个Teacher类，包含姓名和职称两个字段和一个输出自己信息的方法，并用ArrayList实现与实例6-1相同的功能。

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

namespace 教师
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

    private void Form1_Load(object sender, EventArgs e)
    {
        label4.Text = "";
    }
    ArrayList a = new ArrayList();
    public void display()
    {
        foreach (object t in a)
        {
            Teacher x = (Teacher)t;
            label4.Text += "n" + x.ShowMsg();
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (textBox1.Text != "" && textBox2.Text != "")
        {
            Teacher x = new Teacher(textBox1.Text, textBox2.Text);
            a.Add(x);
            label4.Text = "";
            display();
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
        }
        else
        {
            MessageBox.Show("请输入完整的信息进行添加！！");
        }
    }

    private void button2_Click(object sender, EventArgs e)
    {
        if (a.Count != 0)
        {
            label4.Text = "";
            display();
        }
        else
        {
            MessageBox.Show("没有教师信息！");
        }
    }

    private void button3_Click(object sender, EventArgs e)
    {
        try
        {
            Teacher t = new Teacher(textBox1.Text, textBox2.Text);
            a.Insert(Convert.ToInt32(textBox3.Text), t);
            label4.Text = "";
            display();
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
        }
        catch
        {
            MessageBox.Show("请输入完整信息");
        }
    }

    private void button4_Click(object sender, EventArgs e)
    {
        try
        {
            if (a.Count != 0)
            {
                a.RemoveAt(Convert.ToInt32(textBox3.Text));
                label4.Text = "";
                display();
            }
            else
            {
                MessageBox.Show("没有教师信息！");
            }
        }
        catch
        {
            MessageBox.Show("请正确输入信息");
        }
    }
}
public class Teacher
{
    string name;
    string title;
    public Teacher(string name, string title)
    {
        this.name = name;
        this.title = title;
    }
    public string ShowMsg()
    {
        return string.Format("姓名：{0},职称：{1}", name, title);
    }
}

}

索引插入：

索引删除：