using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace 落地页测试代码
{public class VerifyCode{public byte[] GetVerifyCode(){int codeW = 80;int codeH = 30;int fontSize = 16;string chkCode = string.Empty;//颜色列表，用于验证码、噪线、噪点 Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue };//字体列表，用于验证码 string[] font = { "Times New Roman" };//验证码的字符集，去掉了一些容易混淆的字符 char[] character = { '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };Random rnd = new Random();//生成验证码字符串 for (int i = 0; i < 4; i++){chkCode += character[rnd.Next(character.Length)];}//写入Session、验证码MD5加密WebHelper.WriteSession("nfine_session_verifycode", Md5.md5(chkCode.ToLower(), 16)); //创建画布Bitmap bmp = new Bitmap(codeW, codeH);Graphics g = Graphics.FromImage(bmp);g.Clear(Color.White);//画噪线 for (int i = 0; i < 3; i++){int x1 = rnd.Next(codeW);int y1 = rnd.Next(codeH);int x2 = rnd.Next(codeW);int y2 = rnd.Next(codeH);Color clr = color[rnd.Next(color.Length)];g.DrawLine(new Pen(clr), x1, y1, x2, y2);}//画验证码字符串 for (int i = 0; i < chkCode.Length; i++){string fnt = font[rnd.Next(font.Length)];Font ft = new Font(fnt, fontSize);Color clr = color[rnd.Next(color.Length)];g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0);}//将验证码图片写入内存流，并将其以 "image/Png" 格式输出 MemoryStream ms = new MemoryStream();try{bmp.Save(ms, ImageFormat.Png);return ms.ToArray();}catch (Exception){return null;}finally{g.Dispose();bmp.Dispose();}}}
}