当前文件： OlympicBook20/App_Code/BaseClass.cs[3K，2009-6-12 11:51:24]，打开代码结构图

		            
  1using System;
  2using System.Data;
  3using System.Configuration;
  4using System.Web;
  5using System.Web.Security;
  6using System.Web.UI;
  7using System.Web.UI.WebControls;
  8using System.Web.UI.WebControls.WebParts;
  9using System.Web.UI.HtmlControls;
 10using System.Drawing;
 11using System.IO;
 12/**//// <summary>
 13/// BaseClass 的摘要说明
 14/// </summary>
 15public class BaseClass
 16...{
 17    public BaseClass()
 18    ...{
 19        //
 20        // TODO: 在此处添加构造函数逻辑
 21        //
 22    }
 23    public string RandomNum(int n)
 24    ...{
 25        string strchar = "0,1,2,3,4,5,6,7,8,9,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,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";
 26        string[] VcArray = strchar.Split(',');
 27        string VNum = "";
 28        int temp = -1;
 29        Random rand = new Random();
 30        for (int i = 1; i < n + 1; i++)
 31        ...{
 32            if (temp != -1)
 33            ...{
 34                rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
 35
 36            }
 37            int t = rand.Next(61);
 38            if (temp != -1 && temp == t)
 39            ...{
 40                return RandomNum(n);
 41            }
 42            temp = t;
 43            VNum += VcArray[t];
 44        }
 45        return VNum;
 46    }
 47    public void CheckCodes(string CheckCode)
 48    ...{
 49        Random rand = new Random();
 50        int iwidth = (int)(CheckCode.Length * 15);
 51        System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 22);
 52        Graphics g = Graphics.FromImage(image);
 53        g.Clear(Color.White);
 54        //画图片的背景噪音线20条
 55        for (int i = 0; i < 20; i++)
 56        ...{
 57            int x1 = rand.Next(image.Width);
 58            int x2 = rand.Next(image.Width);
 59            int y1 = rand.Next(image.Height);
 60            int y2 = rand.Next(image.Height);
 61            g.DrawLine(new Pen(Color.Silver), x1, x2, y1, y2);
 62        }
 63        //定义颜色
 64        Color[] c = ...{ Color.Black,Color.Red,Color.DarkBlue,Color.Green,Color.Orange,Color.Brown,Color.DarkCyan,Color.Purple,Color.YellowGreen };
 65        //定义字体 
 66        string[] font = ...{ "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体","新宋体" };
 67
 68        //随机输出噪点
 69        for (int i = 0; i < 50; i++)
 70        ...{
 71            int x = rand.Next(image.Width);
 72            int y = rand.Next(image.Height);
 73            g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
 74        }
 75
 76        //输出不同字体和颜色的验证码字符
 77        for (int i = 0; i < CheckCode.Length; i++)
 78        ...{
 79            int cindex = rand.Next(7);
 80            int findex = rand.Next(6);
 81
 82            Font f = new System.Drawing.Font(font[findex], 12, System.Drawing.FontStyle.Bold);
 83            Brush b = new System.Drawing.SolidBrush(c[cindex]);
 84            int ii = 4;
 85            if ((i + 1) % 2 == 0)
 86            ...{
 87                ii = 2;
 88            }
 89            g.DrawString(CheckCode.Substring(i, 1), f, b, 3 + (i * 12), ii);
 90        }
 91        //画一个边框
 92
 93        g.DrawRectangle(new Pen(Color.Black, 0), 0, 0, image.Width - 1, image.Height - 1);
 94
 95        //输出到浏览器
 96        System.IO.MemoryStream ms = new System.IO.MemoryStream();
 97        image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
 98        HttpContext.Current.Response.ClearContent();
 99        //Response.ClearContent();
100        HttpContext.Current.Response.ContentType = "image/Png";
101        HttpContext.Current.Response.BinaryWrite(ms.ToArray());
102        g.Dispose();
103        image.Dispose();
104    }
105    public void MessageBoxs(string TxtMessages) 
106    ...{ 
107        //Page.ClientScript.RegisterStartupScript(this.GetType(),"alert","<script language=javascript>alert('"+TxtMessages+"');</script>");  
108    }
109}
110