当前文件： OnlineVote/Default.aspx.cs[3K，2009-6-12 11:51:27]，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.Data.SqlClient;
 12using System.Text;
 13
 14public partial class _Default : System.Web.UI.Page
 15...{
 16    //下载自http://www.51aspx.com/CV/OnlineVote
 17    private static string sValidator = "";
 18    private StringBuilder LetterList = new StringBuilder();
 19    private readonly string sValidatorImageUrl = "ValidateImage.aspx?Validator=";
 20
 21    protected void Page_Load(object sender,EventArgs e)
 22    ...{
 23        /**////添加页面初始化代码
 24        if(!Page.IsPostBack)
 25        ...{
 26            /**////创建验证字符串
 27            sValidator = CreateValidateString(6);
 28            ValidateImage.ImageUrl = sValidatorImageUrl + sValidator;
 29        }
 30    }
 31
 32    protected void LoginBtn_Click(object sender,EventArgs e)
 33    ...{
 34        /**////如果页面输入合法
 35        if(Page.IsValid == true)
 36        ...{
 37            if(Validator.Text != sValidator)
 38            ...{
 39                Message.Text = "验证码输入错误，请重新输入验证码！！！";
 40                sValidator = CreateValidateString(6);
 41                ValidateImage.ImageUrl = sValidatorImageUrl + sValidator;
 42                return;
 43            }
 44
 45            String userId = "";
 46
 47            /**////定义类并获取用户的登陆信息            
 48            IUser user = new User();
 49            SqlDataReader recu = user.GetUserLogin(UserName.Text.Trim(),
 50                Password.Text.Trim());
 51
 52            /**////判断用户是否合法
 53            if(recu.Read())
 54            ...{
 55                userId = recu["UserID"].ToString();
 56            }
 57            recu.Close();
 58
 59            /**////验证用户合法性，并跳转到系统平台
 60            if((userId != null) && (userId != ""))
 61            ...{
 62                Session["UserID"] = userId;
 63
 64                //跳转到登录后的第一个页面
 65                Response.Redirect("~/VoteDesktop.aspx");
 66            }
 67            else
 68            ...{
 69                /**////创建验证字符串
 70                sValidator = CreateValidateString(6);
 71                ValidateImage.ImageUrl = sValidatorImageUrl + sValidator;
 72                /**////显示错误信息
 73                Message.Text = "你输入的用户名称或者密码有误，请重新输入！";
 74            }
 75        }
 76    }
 77
 78    protected void CancelBtn_Click(object sender,EventArgs e)
 79    ...{
 80        /**////清空用户名称和密码输入框
 81        UserName.Text = Password.Text = "";
 82
 83        /**////创建验证字符串
 84        sValidator = CreateValidateString(6);
 85        ValidateImage.ImageUrl = sValidatorImageUrl + sValidator;
 86    }
 87
 88    /**//// <summary>
 89    /// 创建一个随机数
 90    /// </summary>
 91    /// <param name="min"></param>
 92    /// <param name="max"></param>
 93    /// <returns></returns>
 94    private int GetRandomint(int min,int max)
 95    ...{
 96        Random random = new Random();
 97        return (random.Next(min,max));
 98    }
 99
100    /**//// <summary>
101    /// 创建验证字符串
102    /// </summary>
103    /// <param name="nLen"></param>
104    /// <returns></returns>
105    private string CreateValidateString(int nLen)
106    ...{
107        /**////初始化
108        InitLetterList();
109
110        /**////创建一个StringBuilder对象
111        StringBuilder sb = new StringBuilder(nLen);
112        for(int i = 0; i < nLen; i++)
113        ...{
114            int index = GetRandomint(0,LetterList.Length - 1);
115            sb.Append(LetterList[index].ToString());
116            LetterList.Remove(index,1);
117        }
118        return (sb.ToString());
119    }
120
121    /**//// <summary>
122    /// 创建所有字符，为创建验证字符串做准备
123    /// </summary>
124    private void InitLetterList()
125    ...{
126        for(int i = 0; i < 10; i++)
127        ...{
128            LetterList.Append(i.ToString());
129        }
130        for(int i = 0; i < 26; i++)
131        ...{
132            LetterList.Append(((char)((int)'a' + i)).ToString());
133        }
134        for(int i = 0; i < 26; i++)
135        ...{
136            LetterList.Append(((char)((int)'A' + i)).ToString());
137        }
138    }
139    protected void GuestBtn_Click(object sender,EventArgs e)
140    ...{
141        Response.Redirect("~/VoteDesktop.aspx");
142    }
143}
144