CTL.Common/VerifyImage.cs

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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Web;
using System.Web.SessionState;
using System.IO;
using System.Text;

namespace CTL.Common
{
    /// <summary>
    /// 验证码（保存入Session[CheckCode]）
    /// </summary>
    public class VerifyImage : System.Web.UI.Page
    {
        /// <summary>
        /// 初始化
        /// </summary>
        /// <param name="e"></param>
        override protected void OnInit(EventArgs e)
        {
            base.OnInit(e);
            Utils.SetSession("CheckCode", null);

            string valationNo = Utils.GetRandomString(1, 4, "0123456789");

            CreateImage(valationNo);
            
            Utils.SetSession("CheckCode", valationNo);
        }

        private void CreateImage(string checkCode)
        {
            int iwidth = (int)(checkCode.Length * 15);
            System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 25);
            Graphics g = Graphics.FromImage(image);
            g.Clear(Color.White);
            //定义颜色
            Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };

            //定义字体          
            string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
            Random rand = new Random();
            //随机输出噪点
            for (int i = 0; i < 100; i++)
            {
                int x = rand.Next(image.Width);
                int y = rand.Next(image.Height);
                g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
            }

            //输出不同字体和颜色的验证码字符
            for (int i = 0; i < checkCode.Length; i++)
            {
                int cindex = rand.Next(7);
                int findex = rand.Next(5);