1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Threading.Tasks;
9 using System.Windows.Forms;
10
11 namespace WindowsFormsApplication2
12 {
13 public partial class Form1 : Form
14 {
15 public Form1()
16 {
17 InitializeComponent();
18 }
19 private void Form1_Load(object sender, EventArgs e)
20 {
21 string vc = "";
22 Random rNum = new Random();//随机生成类
23 int num1 = rNum.Next(0, 9);//返回指定范围内的随机数
24 int num2 = rNum.Next(0, 9);
25 int num3 = rNum.Next(0, 9);
26 int num4 = rNum.Next(0, 9);
27
28 int[] nums = new int[4] { num1, num2, num3, num4 };
29 for (int i = 0; i < nums.Length; i++)//循环添加四个随机生成数
30 {
31 vc += nums[i].ToString();
32 }
33 lblVerificationCode.Text = vc;
34 }
35 private void btnVerification_Click(object sender, EventArgs e)
36 {
37 if (txtInput.Text != null && txtInput.Text != "")//用户输入不为空
38 {
39 if (txtInput.Text == lblVerificationCode.Text)//判断用户输入与随机生成的四位数是否相同
40 {
41 MessageBox.Show("验证成功！");
42 }
43 else
44 {
45 MessageBox.Show("验证失败！");
46 }
47 }
48 else
49 {
50 MessageBox.Show("请输入验证码！");
51 }
52 }
53
54
55 }
56 }
