Song.Site/Manage/Utility/CalcImg.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;

namespace Song.Site.Manage.Utility
{
    /// <summary>
    /// 生成计算公式的验证码？
    /// </summary>
    public partial class CalcImg : System.Web.UI.Page
    {
        //随机字符串的长度
        int _maxResu = WeiSha.Common.Request.QueryString["max"].Int16 ?? 4;
        //字符类型：1为加公式，2为加减，3为四则运算；
        int _type = WeiSha.Common.Request.QueryString["type"].Int16 ?? 2;
        //cookies的名称
        string _name = WeiSha.Common.Request.QueryString["name"].String ?? "default";
        /// <summary>
        /// 
        /// </summary>
        /// <param name="Src"></param>
        /// <param name="E"></param>
        protected void Page_Load(Object Src, EventArgs E)
        {
            string opero = this.getOperator(_type);
            int result = 0;
            string formula = this.getFormula(_maxResu, opero, out result);
            //存储随机数
            HttpCookie cookie = new HttpCookie(_name);
            cookie.Value = Md5(result.ToString());
            Response.Cookies.Add(cookie);

            //生成校验码的图片
            ValidateCode(this, formula);           
        }
        /// <summary>
        /// 生成Md5加密码，Md5为不可逆加密
        /// </summary>
        /// <param name="str">需要加密的字符串</param>
        /// <param name="code">Md5加密分16位与32位，此处应设16或32</param>
        /// <returns>返回值为加密后的16位32位字符</returns>
        public static string Md5(string str, int code)
        {
            if (code == 16) //16位MD5加密（取32位加密的9~25字符） 
            {
                return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8, 16);
            }
            else//32位加密 
            {
                return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();
            }