MVC验证码的编写

主要是相互学习一下mvc，希望各位大神指导

/// <summary>
        /// 生成随机数字
        /// </summary>
        /// <returns>随机数字</returns>
        public string GetCode(int len = 4)
        {
            string strCode = string.Empty;
            char code;
            int num;
            Random rnd = new Random();
            for (int i = 0; i < len; i++)
            {
                num = rnd.Next();
                if (num % 2 == 0)
                {
                    code = (char)('0' + (char)(num % 10));
                }
                else
                {
                    //code = (char)('0' + (char)(num % 10));
                   code = (char)('A' + (char)(num % 26));
                }
                strCode += code.ToString();
            }
            return strCode;
        }

 

        /// <summary>
        /// 生成验证码（保存验证码到图片）
        /// </summary>
        /// <returns>二进制</returns>
        public byte[] ProcessRequestImage(string validateCode)
        {

            HttpContext context = HttpContext.Current;
            using (Bitmap bmp = new Bitmap(validateCode.Length * 15 + 10, 28))
            {
                Graphics g = Graphics.FromImage(bmp);
                g.Clear(Color.White);
                Random rnd = new Random();
                for (int i = 0; i < 2; i++)
                {
                    int x1 = rnd.Next(bmp.Width);
                    int y1 = rnd.Next(bmp.Height);
                    int x2 = rnd.Next(bmp.Width);
                    int y2 = rnd.Next(bmp.Height);
                    g.DrawLine(new Pen(Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))), x1, y1, x2, y2);
                }
                g.DrawRectangle(new Pen(Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))), new Rectangle(0, 0, bmp.Width - 1, bmp.Height - 1));
                for (int i = 0; i < 25; i++)
                {
                    bmp.SetPixel(rnd.Next(bmp.Width), rnd.Next(bmp.Height), Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255)));
                }
                for (int i = 0; i < validateCode.Length; i++)
                {
                    FontFamily[] familys = FontFamily.Families;
                    FontFamily family = familys[rnd.Next(familys.Length)];
                    g.DrawString(validateCode[i].ToString(), new Font(family, 14, FontStyle.Bold), new SolidBrush(Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))), new PointF(1 + i * 15, 1));
                }

                //保存图片数据
                MemoryStream stream = new MemoryStream();
                bmp.Save(stream, ImageFormat.Jpeg);

                //  输出图片流
                return stream.ToArray();
            }
        }

     /// <summary>
        /// 验证码
        /// </summary>
        /// <returns></returns> 
        public ActionResult VerifyCode()
        {
            h.Base.Public.SecurityCode seCode = new h.Base.Public.SecurityCode();
            var code = seCode.GetCode();
            Session["code"] = code;
            var bytes = seCode.ProcessRequestImage(code);
            return File(bytes, "image/jpeg");
        }

  <div class="pdiv">
                <input type="image" id="valiCode"     src="/Based/VerifyCode" />
</div>

<script>
    (function () {
  //刷新验证码
        var codeUrl = "/Based/VerifyCode";
        $(valiCode).on("click", function () {
            this.src = codeUrl + "?time=" + (new Date()).getTime();
        });

    })(jQuery)
</script>

 这段代码我测试过了。。  是可以通过的。