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 = )
         {
             string strCode = string.Empty;
             char code;
             int num;
             Random rnd = new Random();
             for (int i = ; i < len; i++)
             {
                 num = rnd.Next();
                 if (num %  == )
                 {
                     code = (char)('' + (char)(num % ));
                 }
                 else
                 {
                     //code = (char)('0' + (char)(num % 10));
                    code = (char)('A' + (char)(num % ));
                 }
                 strCode += code.ToString();
             }
             return strCode;
         }

生成随机数

         /// <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 *  + , ))
             {
                 Graphics g = Graphics.FromImage(bmp);
                 g.Clear(Color.White);
                 Random rnd = new Random();
                 for (int i = ; i < ; 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(), rnd.Next(), rnd.Next())), x1, y1, x2, y2);
                 }
                 g.DrawRectangle(new Pen(Color.FromArgb(rnd.Next(), rnd.Next(), rnd.Next())), new Rectangle(, , bmp.Width - , bmp.Height - ));
                 for (int i = ; i < ; i++)
                 {
                     bmp.SetPixel(rnd.Next(bmp.Width), rnd.Next(bmp.Height), Color.FromArgb(rnd.Next(), rnd.Next(), rnd.Next()));
                 }
                 for (int i = ; i < validateCode.Length; i++)
                 {
                     FontFamily[] familys = FontFamily.Families;
                     FontFamily family = familys[rnd.Next(familys.Length)];
                     g.DrawString(validateCode[i].ToString(), new Font(family, , FontStyle.Bold), new SolidBrush(Color.FromArgb(rnd.Next(), rnd.Next(), rnd.Next())), new PointF( + i * , ));
                 }

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

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

生成验证码图片

      /// <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");
         }

控制器代码

   <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>

view视图代码

这段代码我测试过了。。  是可以通过的。