当前文件： HBDBlog/Admin/CheckCode.aspx.cs[1K，2009-6-12 11:43:44]，打开代码结构图

		            
 1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Collections;
 5using System.Web;
 6using System.Web.Security;
 7using System.Web.UI;
 8using System.Web.UI.WebControls;
 9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11using System.Drawing;
12using System.IO;
13using System.Drawing.Imaging;
14public partial class Admin_CheckCode : System.Web.UI.Page
15...{
16    protected void Page_Load(object sender, EventArgs e)
17    ...{
18            string str = getRandCode(4);
19            Session["rand"] = str;
20            buildImage(str);
21        }
22        生成随机数#region 生成随机数
23        public string getRandCode(int count)
24        ...{
25            string str = "1,2,3,4,5,6,7,8,9";
26            string[] strScope = str.Split(',');
27            Random rand = new Random();
28            string randCode = "";
29            int index;
30
31            while (count > 0)
32            ...{
33                index = rand.Next(0, strScope.Length - 1);
34                randCode += strScope[index];
35                count--;
36            }
37            return randCode;
38        }
39        #endregion 
40
41        生成图片#region 生成图片
42        private void buildImage(string randCode) ...{
43            Bitmap bmp = new Bitmap(14 * randCode.Length + 12, 24);
44
45            Graphics dc = Graphics.FromImage(bmp);
46            dc.DrawString(randCode, new Font("arial", 12), Brushes.White, 3, 3);
47            MemoryStream ms = new MemoryStream();
48            bmp.Save(ms, ImageFormat.Jpeg);
49
50            Response.ContentType = "image/jpeg";
51            Response.BinaryWrite(ms.ToArray());
52
53            dc.Dispose();
54            bmp.Dispose();
55            Response.End();
56        }
57        #endregion 
58    }
59
60