CY_ZZJY.Web/ashx/VaildateCode.ashx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Text;

namespace CY_ZZJY.Web.ashx
{
    /// <summary>
    /// VaildateCode 的摘要说明
    /// </summary>
    public class VaildateCode : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            string checkCode = RndNum(4);
            HttpCookie cookie = new HttpCookie("VaildateCode", checkCode);
            context.Response.SetCookie(cookie);
            context.Response.ContentType = "image/Gif";
            GenImg(context, checkCode);
        }
        private static void WriteCookie(HttpContext context, string strCookieName, string strCookieValue)
        {
            HttpCookie cookie = new HttpCookie("SystemCookie");
            cookie.Values[strCookieName] = strCookieValue;
            cookie.Expires = DateTime.MaxValue;
            context.Response.Cookies.Add(cookie);
        }
        #region 生成0-9随机数
        /// <summary>
        /// 生成0至9的随机数
        /// </summary>
        /// <param name="VcodeNum">生成长度</param>
        /// <param name="IsWirteCook">是否写入Session</param>
        /// <returns></returns>
        private static string RndNum(int VcodeNum)
        {
            Random rnd = new Random();
            StringBuilder sb = new StringBuilder(VcodeNum);
            int i = 1;
            while (i <= VcodeNum)
            {
                sb.Append(rnd.Next(9).ToString());
                i++;
            }
            return sb.ToString();
        }
        #endregion

        #region 生产图片
        /// <summary>
        /// 生产图片
        /// </summary>
        /// <param name="context"></param>
        private static void GenImg(HttpContext context, string checkCode)
        {