C#生成验证码图片的方法

这篇文章主要为大家详细介绍了C#生成验证码图片的方法，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

本文实例为大家分享了C#生成验证码图片的具体代码，供大家参考，具体内容如下

				?

									/// <summary>

									    /// 生成验证码图片

									    /// </summary>

									    /// <returns></returns>

									    public byte[] GetVerifyCode()

									    {

									      int codeW = 80;

									      int codeH = 40;

									      int fontSize = 18;

									      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 = { '2', '3', '4', '5', '6', '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)];

									      }

									      //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 < 1; 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();

									      }

									    }