C#实现猜数字小游戏

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 _1csz
{
  public partial class Form1 : Form
  {
    int x;///定义的是一个全局变量
    public Form1()
    {
      InitializeComponent();
    }
 
    private void button1_Click(object sender, EventArgs e)///产生一个随机数
    {
      Random rd = new Random();
      x = rd.Next(100);
    }
 
    private void button2_Click(object sender, EventArgs e)///显示正确答案
    {
      label4.Visible = true;
      label4.Text = x.ToString();
    }
 
    private void button3_Click(object sender, EventArgs e)///退出键
    {
      Application.Exit();
    }
 
    private void Form1_Load(object sender, EventArgs e)///窗体初始化
    {
      label3.Visible = false;
      label4.Visible = false;
    }
 
    private void textBox1_KeyDown(object sender, KeyEventArgs e)///KeyDown事件：当焦点在文本框时按下任何键都触发该事件
    {
      if (e.KeyCode==Keys.Enter)///KeyCode属性获取KeyUp和KeyDown事件的键盘代码，其值用Keys枚举成员名
      {
        if (x==int.Parse(textBox1.Text))
        {
          label3.Visible = true;
          label3.Text = "猜对了，你真棒！";
        }
        else if (int.Parse(textBox1.Text) > x)
        {
          label3.Visible = true;
          label3.Text = "真是，猜大了！";
        }
        else
        {
          label3.Visible = true;
          label3.Text = "真是，猜小了！";
        }
      }
    }
 
  }
}