XDF/CheckCode.aspx.cs

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


    public partial class CheckCode : System.Web.UI.Page
    {
        private string code;
        private const int ImageHeigth = 22;             //验证码图片的高度
        private const double ImageLengthBase = 12.5;    //验证码图片中每个字符的宽度
        private const int ImageLineNumber = 25;         //噪音线的数量
        private const int ImagePointNumber = 100;       //噪点的数量
        private int length;
        public static string VALIDATECODEKEY;       //此处用来保存验证码到Session的Key的名称

        static CheckCode()
        {
            VALIDATECODEKEY = "VALIDATECODEKEY";
        }


        //设置验证码的长度和内容
        public CheckCode()
        {
            this.length = 4;
            this.code = string.Empty;
        }

        /// <summary>
        /// 产生随机的验证码并加入Session
        /// </summary>
        /// <param name="length">验证码长度</param>
        /// <returns></returns>
        public string CreateCode(int length)
        {
            if (length <= 0)
            {
                return string.Empty;
            }
            Random random = new Random();
            StringBuilder builder = new StringBuilder();
            //产生随机的验证码并拼接起来
            for (int i = 0; i < length; i++)
            {
                builder.Append(random.Next(0, 10));
            }
            this.code = builder.ToString();
            this.Session[VALIDATECODEKEY] = this.code;
            return this.code;
        }

        /// <summary>