CC.Common/VerifyImage.cs

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namespace CC.Common
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Drawing;
    using System.Web;
    using System.IO;
    using System.Drawing.Imaging;

    /// <summary>
    /// 验证码 继承 System.Web.UI.Page ，Session["CheckCode"]
    /// </summary>
    public class VerifyImage : System.Web.UI.Page
    {
        private void Page_Load(object sender, EventArgs e)
        {
            char[] chars = "0123456789".ToCharArray();
            System.Random random = new Random();

            string validateCode = string.Empty;
            for (int i = 0; i < 4; i++)
            {
                char rc = chars[random.Next(0, chars.Length)];
                if (validateCode.IndexOf(rc) > -1)
                {
                    i--;
                    continue;
                }
                validateCode += rc;
            }
            Session["CheckCode"] = validateCode;
            CreateImage(validateCode);
        }
        /// <summary>
        /// 创建图片
        /// </summary>
        /// <param name="checkCode"></param>
        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.Chocolate, Color.Brown, Color.DarkCyan, Color.Purple };
            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++)
            {