当前文件： 51Job/App_Code/CommonComponent/ValidateCode.cs[2K，2009-6-12 11:31:08]，打开代码结构图

		            
 1using System;
 2using System.IO;
 3using System.Drawing;
 4using System.Drawing.Imaging;
 5using System.Text;
 6
 7namespace HRManager.CommonComponent
 8...{
 9    /**//// <summary>
10    /// 生成验证码图象类
11    /// </summary>
12    public class ValidateCode
13    ...{
14        private const int CODELEN = 4;  //4位验证码
15        
16        public string code;             //生成的验证码
17        public string imgFilePath ;     //生成的图象路径
18        public string imgFileName;      //生成的图象文件名
19
20        /**//// <summary>
21        /// 构造函数，得到保存图象的路径
22        /// </summary>
23        public ValidateCode(string imgFilePath)
24        ...{
25            this.imgFilePath = imgFilePath;
26        }
27
28        /**//// <summary>
29        /// 析构函数，删除生成的图象文件
30        /// </summary>
31        ~ValidateCode()
32        ...{
33            File.Delete(this.imgFilePath+this.imgFileName);    //使用File的Delete静态方法，删除临时图象
34        }
35
36        /**//// <summary>
37        /// 生成验证码图象文件，并存储在服务器中
38        /// </summary>
39        public void GenerateCodeImage()
40        ...{
41            this.GetCode();
42            Bitmap img = null;
43            Graphics g = null;            
44
45            int gHeight = code.Length * 12;
46            img = new Bitmap(gHeight, 25);
47            g = Graphics.FromImage(img);
48
49            g.Clear(Color.AliceBlue);                       //背景颜色            
50            Font font = new Font("Arial Black", 10);        //文字字体
51            SolidBrush brush = new SolidBrush(Color.Black); //文字颜色
52           
53            g.DrawString(this.code, font, brush, 3, 3);
54            
55            this.imgFileName = this.code + ".Png";
56            img.Save(this.imgFilePath+this.imgFileName, ImageFormat.Png);
57
58            g.Dispose();
59            img.Dispose();
60        }
61
62        /**//// <summary>
63        /// 生成随即的四位字母、数字混合串
64        /// </summary>
65        /// <returns>四位字母、数字混合串</returns>
66        public void GetCode()
67        ...{
68            char[] allChars = new char[]...{
69                '0','1','2','3','4','5','6','7','8','9',
70                'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
71                'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
72            };
73            
74            Random rand = new Random();
75
76            for (int i = 0; i < CODELEN; i++)
77            ...{
78                rand = new Random((i+1) * (int)DateTime.Now.Ticks);
79                this.code+= allChars[rand.Next(allChars.Length - 1)];
80            }
81        }      
82    }
83}