asp.net MVC 在Controller控制器中實作驗證碼輸出

   asp.net mvc專案使用到驗證碼，為了讓以前的WebForm代碼能利用上代碼經過稍微的改動即可使用代碼如下：

using System;using System.Collections.Generic;using System.Web;using System.Web.Mvc;using System.Web.UI;using System.Web.UI.WebControls;using System.Drawing;namespace Angel.Web.Controllers{    public class CheckCodeController : Controller    {        //        // GET: /CheckCode/        public ActionResult Index()        {            this.CreateCheckCodeImage(GenerateCheckCode());            return View();        }        private string GenerateCheckCode()        {            int number;            char code;            string checkCode = String.Empty;            System.Random random = new Random();            for (int i = 0; i < 5; i++)            {                number = random.Next();                if (number % 2 == 0)                    code = (char)('0' + (char)(number % 10));                else                    code = (char)('A' + (char)(number % 26));                if (code == '0' || code == 'o' || code == 'L' || code == 'I')                {                    i = i - 1;                }                else                {                    checkCode += code.ToString();                }            }            //	Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));            Session.Contents["checkcode"] = checkCode;            return checkCode;        }        private void CreateCheckCodeImage(string checkCode)        {            if (checkCode == null || checkCode.Trim() == String.Empty)                return;            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);            Graphics g = Graphics.FromImage(image);            try            {                //生成隨機生成器                Random random = new Random();                //清空圖片背景色                g.Clear(Color.White);                //畫圖片的背景噪音線                for (int i = 0; i < 25; i++)                {                    int x1 = random.Next(image.Width);                    int x2 = random.Next(image.Width);                    int y1 = random.Next(image.Height);                    int y2 = random.Next(image.Height);                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);                }                Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);                g.DrawString(checkCode, font, brush, 2, 2);                //畫圖片的前景噪音點                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()));                }                //畫圖片的邊框線                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);                System.IO.MemoryStream ms = new System.IO.MemoryStream();                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);                Response.ClearContent();                Response.ContentType = "image/Gif";                Response.BinaryWrite(ms.ToArray());            }            finally            {                g.Dispose();                image.Dispose();            }        }    }}

　　最后別忘了session的獲取設定，需要在Global.asax.cs檔案中新增如下代碼：

        /// <summary>        /// MVC為了獲取session引數        /// </summary>        public override void Init()        {            PostAuthenticateRequest += (s, e) => HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);            base.Init();        }        void MvcApplication_PostAuthenticateRequest(object sender, EventArgs e)        {            HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);        }

html頁面代碼：

Views html代碼<img name="img1" id="img1" style="position:absolute;top:5px;right:36px!important;z-index:1000;" alt="單擊圖片重繪驗證碼" src="https://www.cnblogs.com/angelasp/p/CheckCode/Index" 
onclick="JavaSccript:reloadImage('CheckCode/Index');" />
<script type="text/javascript">

function reloadImage(url) {
document.getElementById("img1").src = https://www.cnblogs.com/angelasp/p/url +'?abc=' + Math.random();
}

   </script>

標籤：ASP.NET

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