当前文件： SiZeYunSuanYanZhengMa/ValidationCode/Image2.aspx.cs[4K，2009-6-12 11:54:19]，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;
 11
 12//该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)
 13
 14using System.Drawing;
 15using System.Drawing.Drawing2D; //引用的命名控件
 16
 17namespace ValidationCode
 18...{
 19    public partial class Image2 : System.Web.UI.Page
 20    ...{
 21        protected void Page_Load(object sender, EventArgs e)
 22        ...{
 23            CreateCheckCodeImage(GetExpressions());
 24        }
 25
 26        /**//// <summary>
 27        /// 产生算术式
 28        /// </summary>
 29        private string GetExpressions()
 30        ...{
 31            Random rd = new Random(); //创建随机数对象       
 32
 33            int Results = 0;
 34            int Num1 = rd.Next(10); ;
 35            int Num2 = rd.Next(10); ;
 36            string Expressions = "";
 37
 38            int F = (rd.Next(4) + 1);
 39            switch (F)
 40            ...{
 41                case 1:
 42                    Results = Num1 + Num2;
 43                    Expressions = Num1 + " 加上 " + Num2;// +" 结果是" +Results;
 44                    break;
 45                case 2:
 46                    Results = Num1 - Num2;
 47                    Expressions = Num1 + " 减去 " + Num2;
 48                    break;
 49                case 3:
 50                    Results = Num1 * Num2;
 51                    Expressions = Num1 + " 乘以 " + Num2;
 52                    break;
 53                case 4:
 54                    if (Num2 > 0)
 55                    ...{
 56                        Results = Convert.ToInt16(Num1 / Num2);
 57                        Expressions = Num1 + " 整除 " + Num2;
 58                    }
 59                    else
 60                    ...{
 61                        Results = Num1;
 62                        Expressions = Num1 + " 整除 1";// + Results;
 63                    }
 64                    break;
 65            }
 66
 67            //验证码值存放到Session中用来比较
 68            Session["Code"] = Results.ToString();
 69            return Expressions;
 70
 71        }
 72
 73//5_1_a_s_p_x.c_o_m
 74
 75        /**//// <summary>
 76        /// 生成图片（增加背景噪音线、前景噪音点）
 77        /// </summary>
 78        /// <param name="checkCode">随机出字符串</param>
 79        private void CreateCheckCodeImage(string checkCode)
 80        ...{
 81            if (checkCode.Trim() == "" || checkCode == null)
 82                return;
 83            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)(checkCode.Length * 14), 22);
 84            Graphics g = Graphics.FromImage(image);
 85            try
 86            ...{
 87                //生成随机生成器
 88                Random random = new Random();
 89
 90                //清空图片背景色
 91                g.Clear(Color.White);
 92
 93                //画图片的背景噪音线
 94                int i;
 95                for (i = 0; i < 25; i++)
 96                ...{
 97                    int x1 = random.Next(image.Width);
 98                    int x2 = random.Next(image.Width);
 99                    int y1 = random.Next(image.Height);
100                    int y2 = random.Next(image.Height);
101                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
102                }
103
104                //定义一个含10种字体的数组
105                String[] fontFamily =...{ "Arial", "Verdana", "Comic Sans MS", "Impact", "Haettenschweiler", "幼圆", "黑体", "隶书", "宋体", "楷体_GB2312" };
106                FontStyle[] fontStyle =...{ FontStyle.Bold, FontStyle.Italic, FontStyle.Regular, FontStyle.Strikeout, FontStyle.Underline };
107                Font font = new System.Drawing.Font(fontFamily[random.Next(9)], 12, fontStyle[random.Next(5)]);
108                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);
109                g.DrawString(checkCode, font, brush, 2, 2);
110
111                //画图片的前景噪音点
112                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
113                System.IO.MemoryStream ms = new System.IO.MemoryStream();
114                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
115                Response.ClearContent();
116                Response.ContentType = "image/Gif";
117                Response.BinaryWrite(ms.ToArray());
118
119            }
120            catch
121            ...{
122                g.Dispose();
123                image.Dispose();
124            }
125
126        }
127
128    }
129}
130