分类：电脑/网络-互联网
问题：验证码源代码实现c#谢谢阿！！ 
谢谢阿！！
回答：using ;using System.Web;using System.Drawing;using System.Drawing.Drawing2D;/// <summary>/// Summary description for yanzhengma/// </summary>public class Yanzhengma{    private string GetRandom()    {        int number;        char charCode;        string strCode = string.Empty;        System.Random random = new System.Random();        for (int i = 1; i <= 5; i++)        {            number = random.Next();            if (number % 2 == 0)            {                charCode = (char)('0' + (char)(number % 10));            }            else            {                charCode = (char)('A' + (char)(number % 26));            }            strCode += charCode.ToString();        }        // System.Web.HttpContext.Current.Response.Cookies        HttpContext.Current.Response.Cookies.Add(new HttpCookie("codebycookies", strCode));        return strCode;    }    public void DrawRandom()    {                string strCode = GetRandom();        Bitmap image = new Bitmap(100, 30);        Graphics huatu = Graphics.FromImage(image);        try        {            //生成随机生成器            Random random = new Random();            //清空图片背景色            huatu.Clear(Color.White);            //画图片的背景噪音线            int x1, x2, y1, y2;            for (int i = 0; i < 10; i++)            {                x1 = random.Next(image.Width);                x2 = random.Next(image.Width);                y1 = random.Next(image.Height);                y2 = random.Next(image.Height);                huatu.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);            }            Font font = new Font("Arial", 20, (FontStyle.Bold | System.Drawing.FontStyle.Italic));            LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);            huatu.DrawString(strCode, font, brush, 2, 2);            //画图片的前景噪音点            for (int i = 0; i < 100; i++)            {                int x = random.Next(image.Width);                int y = random.Next(image.Height);                image.SetPixel(x, y, Color.FromArgb(random.Next()));            }            //画图片的边框线            huatu.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width, image.Height);            System.IO.MemoryStream ms = new System.IO.MemoryStream();            image.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);            HttpContext.Current.Response.ClearContent();            HttpContext.Current.Response.BinaryWrite(ms.ToArray());        }        finally        {            huatu.Dispose();            image.Dispose();        }    }}