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2008-01-23

C# 验证码

时间: 2008-01-23 22:24:54 作者: admin 阅读次数: 1011
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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;

namespace DesignCoding.Blog.Web.Common
{
    public partial class Validate : BasePage
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            InitPage();
            this.CreateCheckCodeImage(GenerateCheckCode());
        }
        private string GenerateCheckCode()
        {
            string CodeName = "CheckCode";
            if (Request.QueryString["ID"] != null && !Request.QueryString["ID"].ToString().Equals(""))
            {
                CodeName ="CheckCode"+ Request.QueryString["ID"].ToString();
            }
            int number;
            char code;
            string checkCode = String.Empty;

            System.Random random = new Random();

            for (int i = 0; i < 6; i++)
            {
                number = random.Next();

                if (number % 2 == 0 || number % 2 != 0) //加上这个" || number % 2 != 0",验证码只有数字
                    code = (char)('0' + (char)(number % 10)); //0
                else
                 code = (char)('A' + (char)(number % 26));  //26

                checkCode += code.ToString();
            }
            //Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
            SetSession(CodeName,checkCode);
            return checkCode;
        }

        private void CreateCheckCodeImage(string checkCode)
        {
            if (checkCode == null || checkCode.Trim() == String.Empty)
                return;

            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 11.3)), 22);//12.5
            Graphics g = Graphics.FromImage(image);

            try
            {
                //生成随机生成器
                Random random = new Random();

                //清空图片背景色
                g.Clear(Color.AliceBlue);//

                //画图片的背景噪音线
                for (int i = 0; i < 25; i++)  //25
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);

                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }

                Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(checkCode, font, brush, 2, 2);

                //画图片的前景噪音点
                for (int i = 0; i < 100; i++) //100
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);

                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }

                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);

                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                Response.Expires = -9999;
                Response.AddHeader("pragma", "no-cache");
                Response.AddHeader("cache-ctrol", "no-cache");
                Response.ClearContent();
                Response.ContentType = "image/Gif";
                Response.BinaryWrite(ms.ToArray());
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
    }
}
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Tags: C# Validate