getRandImg.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;
using System.Drawing.Drawing2D;
public partial class getRandImg : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
        {
            //生成随机码图片
            SetValidateCode();
            //生成页面不保存到cache
            Response.Cache.SetNoStore();
      
          
        }

        //设置验证码
        private void SetValidateCode()
        {
            //新建位图
            Bitmap newBitmap = new Bitmap(
                                            71,
                                            23,
                                            PixelFormat.Format32bppArgb
                                         );
            //从位图获得绘图画面
            Graphics g = Graphics.FromImage(newBitmap);
            //随机数生成器
            Random r = new Random();
            //绘图画面清空
            g.Clear(Color.White);
            //绘图画面划线干扰
            for (int i = 0; i < 50; i++)
            {
                int x1 = r.Next(newBitmap.Width);
                int x2 = r.Next(newBitmap.Width);
                int y1 = r.Next(newBitmap.Height);
                int y2 = r.Next(newBitmap.Height);
                g.DrawLine(new Pen(
                                    Color.FromArgb(r.Next())),
                                    x1,
                                    y1,
                                    x2,
                                    y2
                                  );
            }
            //绘图画面点数干扰
            for (int i = 0; i < 100; i++)
            {
                int x = r.Next(newBitmap.Width);
                int y = r.Next(newBitmap.Height);