using System;

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 test_4_2
{
public partial class Form1 : Form
{
private int ti_shu, right_shu, result;
public Form1()
{
InitializeComponent();
}

private void Chu_ti()
{
Random randobj = new Random();
int a = randobj.Next(10, 100);
int b = randobj.Next(10, 100);
int p = randobj.Next(0, 2);
if (p == 0) //出加法题
{
label1.Text = a.ToString() + " + " + b.ToString() + " = ";
result = a + b;
}
else //出减法题
{
if (a < b)
{
int t = a;
a = b;
b = t;
}
label1.Text = a.ToString() + " - " + b.ToString() + " = ";
result = a - b;
}
ti_shu += 1;
textBox1.Text = ""; //清空答题文本框
}

private void TextBox1_KeyPress(object sender, KeyPressEventArgs e)
{
string Item;
double k;
if (e.KeyChar == 13) //判断是否按下回车键
{
if (Convert.ToInt16(textBox1.Text) == result) //文本内容转换为数字类型并与结果比较
{
Item = label1.Text + textBox1.Text + "✓";
right_shu += 1;
}
else
Item = label1.Text + textBox1.Text + "✗";
this.listBox1.Items.Add(Item);
this.textBox1.Text = "";
k = (double)right_shu / ti_shu;
label2.Text = "共" + ti_shu + "题" + "正确率为：" + "\n\n" + k.ToString();
Chu_ti();
}
}

private void Form1_Load(object sender, EventArgs e)
{
ti_shu = 0;
right_shu = 0;
Chu_ti();
}
}
}
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2.Form.Designer.cs

代码如下（示例）：

using System;

namespace test_4_2
{
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}

#region Windows 窗体设计器生成的代码

/// <summ