C# 图片验证码简单例子
一、简述
记--使用PictureBox绘制验证码。
例子：外链:https://wwm.lanzouq.com/b0cafckej 密码:cxxn
二、效果
三、工程结构
四、源文件
Form1.cs文件
using System;
using System.Drawing;
using System.Windows.Forms;namespace VerificationCode
{public partial class Form1 : Form{const int mRandomCharCount = 4;string mVerificationCode = "";public Form1(){InitializeComponent();}private void RefreshVerificationCode(){mVerificationCode = "";Random rdm = new Random();string[] fonts = { "微软雅黑", "宋体", "黑体", "隶书", "仿宋" };Color[] colors = { Color.Pink, Color.Blue, Color.Black, Color.Red, Color.Purple, Color.Green };const string randomStr = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机生成4个字符for (int i = 0; i < mRandomCharCount; i++){mVerificationCode += randomStr[rdm.Next(0, randomStr.Length)].ToString();}//4个字符按不同的字体颜色进行绘制Bitmap bmp = new Bitmap(pictureBoxVerificationCode.Width, pictureBoxVerificationCode.Height);Graphics g = Graphics.FromImage(bmp);for (int i = 0; i < mRandomCharCount; i++){Point p = new Point(i * 27, 0);g.DrawString(mVerificationCode[i].ToString(), new Font(fonts[rdm.Next(0, fonts.Length)], 28, FontStyle.Bold), new SolidBrush(colors[rdm.Next(0, colors.Length)]), p);}//绘制17条线条for (int i = 0; i < 16; i++){Point p1 = new Point(rdm.Next(0, bmp.Width), rdm.Next(0, bmp.Height));Point p2 = new Point(rdm.Next(0, bmp.Width), rdm.Next(0, bmp.Height));g.DrawLine(new Pen(Brushes.Green), p1, p2);}//绘制300个点for (int i = 0; i < 300; i++){Point p = new Point(rdm.Next(0, bmp.Width), rdm.Next(0, bmp.Height));bmp.SetPixel(p.X, p.Y, Color.Black);}Console.WriteLine(mVerificationCode);//将图片镶嵌到PictureBox中pictureBoxVerificationCode.Image = bmp;}private void pictureBoxVerificationCode_Click(object sender, EventArgs e){//刷新验证码RefreshVerificationCode();}private void buttonSure_Click(object sender, EventArgs e){//if (textBoxVerificationCode.Text == mVerificationCode) //区分大小写if (textBoxVerificationCode.Text.Equals(mVerificationCode, StringComparison.OrdinalIgnoreCase)) //不s区分大小写{MessageBox.Show("验证码正确!", "提示");}else{MessageBox.Show("验证码错误!", "错误");RefreshVerificationCode();textBoxVerificationCode.Text = "";}}private void Form1_Load(object sender, EventArgs e){RefreshVerificationCode();}}
}
