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  • C# ashx生成的验证码

    public void ProcessRequest(HttpContext context)
    {
    context.Response.ContentType = "image/jpeg";
    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", "MS Mincho", "Book Antiqua", "Gungsuh", "PMingLiU", "Impact" };
    //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', '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)];
    }
    using( Bitmap bmp = new Bitmap(100, 40))
    using (Graphics g = Graphics.FromImage(bmp))
    {
    g.Clear(Color.White);
    //画噪线
    for (int i = 0; i < 10; i++)
    {
    int x1 = rnd.Next(100);
    int y1 = rnd.Next(40);
    int x2 = rnd.Next(100);
    int y2 = rnd.Next(40);
    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, 18);
    Color clr = color[rnd.Next(color.Length)];
    g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 20 + 8, (float)8);
    }
    //画噪点
    for (int i = 0; i < 100; i++)
    {
    int x = rnd.Next(bmp.Width);
    int y = rnd.Next(bmp.Height);
    Color clr = color[rnd.Next(color.Length)];
    bmp.SetPixel(x, y, clr);
    }
    bmp.Save(context.Response.OutputStream, ImageFormat.Jpeg);

    }

    }

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  • 原文地址:https://www.cnblogs.com/ZX-LMY/p/5561631.html
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