投票系统-显示所有的投票主题（进行投票）

1，本投票系统通过博客Id获取用户Id，再通过用户ID获取投票主题

界面如下：

后台代码如下：

代码

1 <%@ Control Language="C#" AutoEventWireup="true" CodeFile="AllVote.ascx.cs" Inherits="AllVote" %>
2 <table style="width:800px; height:400px"   cellspacing="0">
3     <tr>
4
5         <td style="width:189px; background-image: url(image/login_1.gif);">
6         </td>
7          <td style="background-image: url(image/login_2.gif)">
8            <table style="width:400px;  height:400px;">
9             <tr >
10                 <td style="width:100px;"></td>
11                 <td style="width:275px;"></td>
12                  <td style="width:100px;"></td>
13             </tr>
14              <tr >
15                 <td style="width:100px;"></td>
16                 <td style="width:275px; text-align: center;">
17                     <span style="font-size: 16pt; color: #66ff00">查看所有投票</span></td>
18                  <td style="width:100px;"></td>
19             </tr>
20              <tr >
21                 <td style="width:100px;"></td>
22                 <td style="width:275px;"></td>
23                  <td style="width:100px;">
24                      <asp:ImageButton ID="returnIndex" runat="server" ImageUrl="~/image/ruturnIndex.gif" OnClick="returnIndex_Click" /></td>
25             </tr>
26              <tr >
27                 <td style="width:100px; height: 68px;"></td>
28                 <td style="width:275px; height: 68px;">
29                     <span style="color: #33cc00">以下列出的是全部投票主题，选择你感兴趣的进行投票吧！</span></td>
30                  <td style="width:100px; height: 68px;"></td>
31             </tr>
32              <tr >
33                 <td style="width:100px; height: 34px;"></td>
34                 <td style="width:275px; height: 34px;"></td>
35                  <td style="width:100px; height: 34px;"></td>
36             </tr>
37              <tr >
38                 <td style="width:100px; height: 34px;"></td>
39                 <td style="width:275px;" rowspan="5">
40                     <asp:DataList ID="DL" runat="server">
41                          <ItemTemplate>
42                             <asp:HyperLink ID="HplinkVoteTitle" runat="server" NavigateUrl='<%# "~/Vote.aspx?Voteid="+DataBinder.Eval(Container.DataItem,"VoteItem_id") %>' Text='<%# DataBinder.Eval(Container.DataItem,"VoteItem") %>' ForeColor="#C04000"></asp:HyperLink>
43                         </ItemTemplate>
44                         <ItemStyle ForeColor="#C04000" />
45                     </asp:DataList></td>
46                  <td style="width:100px; height: 34px;"></td>
47             </tr>
48              <tr >
49                 <td style="width:100px;"></td>
50                  <td style="width:100px;"></td>
51             </tr>
52              <tr >
53                 <td style="width:100px;"></td>
54                  <td style="width:100px;"></td>
55             </tr>
56              <tr >
57                 <td style="width:100px;"></td>
58                  <td style="width:100px;"></td>
59             </tr>
60              <tr >
61                 <td style="width:100px; height: 27px;"></td>
62                  <td style="width:100px; height: 27px;"></td>
63             </tr>
64              <tr >
65                 <td colspan="3">
66                     <table>
67                     <tr>
68                        <td style="width: 96px; height: 21px">共有
69                            <asp:Label ID="labCount" runat="server" Text=" "></asp:Label>页</td>
70                        <td style="width: 97px; height: 21px;"> 当前<asp:Label ID="labNowPage" runat="server" Text="1"></asp:Label>页</td>
71                        <td style="width: 15px; height: 21px">
72                            <asp:LinkButton ID="lnkbtnFirst" runat="server" Width="47px" OnClick="lnkbtnFirst_Click">首页</asp:LinkButton></td>
73                        <td style="width: 70px; height: 21px;"> <asp:LinkButton ID="lnkbtnFront" runat="server" OnClick="lnkbtnFront_Click">上一页</asp:LinkButton></td>
74                        <td style="width: 74px; height: 21px;"> <asp:LinkButton ID="lnkbtnNext" runat="server" OnClick="lnkbtnNext_Click">下一页</asp:LinkButton></td>
75                        <td style="width: 126px; height: 21px;"> <asp:LinkButton ID="lnkbtnLast" runat="server" Width="33px" OnClick="lnkbtnLast_Click"> 尾页</asp:LinkButton></td>
76
77                     </tr>
78
79                   </table>
80                 </td>
81             </tr>
82            </table>
83
84
85
86
87         </td>
88          <td style="width:200px; background-image: url(image/login_3.gif);">
89          </td>
90     </tr>
91
92 </table>
93

。cs后台代码

代码

  1 using System;
  2 using System.Data;
  3 using System.Configuration;
  4 using System.Collections;
  5 using System.Web;
  6 using System.Web.Security;
  7 using System.Web.UI;
  8 using System.Web.UI.WebControls;
  9 using System.Web.UI.WebControls.WebParts;
10 using System.Web.UI.HtmlControls;
11
12 public partial class AllVote : System.Web.UI.UserControl
13 {
14     BaseDb obj = new BaseDb();
15
16     protected void Page_Load(object sender, EventArgs e)
17     {
18         if (!IsPostBack)
19         {
20             Bind();
21         }
22
23     }
24
25     #region  获得博客ID
26     public int GetBlogID()
27     {
28         int BlogID =3;
29         return BlogID;
30     }
31
32     #endregion
33
34     #region 获得用户ID
35     public int GetUserID()
36     {
37         int userID = 0;
38         int BlogId = GetBlogID();
39         try
40         {        //根据博客ID获取用户ID
41             DataSet ds = obj.getdatabydataset("select User_id from BlogManage where Blog_id=" + "'" + BlogId + "'");
42
43             userID = Convert.ToInt32(ds.Tables[0].Rows[0][0].ToString());
44
45         }
46         catch (Exception ee)
47         {
48             Response.Write("<script>alert('" + ee.Message + "');</script>");
49         }
50
51         return userID;
52     }
53
54     #endregion
55
56     public void Bind()
57     {
58         int CurrentPage = Convert.ToInt32(labNowPage.Text);
59         PagedDataSource ps = new PagedDataSource();//生产PagedDataSource的实例  主要是实现datalist分页
60         int userID = GetUserID();
61         DataSet ds = obj.getdatabydataset("select VoteItem_id,VoteItem from VoteItem where User_id = " + "'" + userID + "'"  );
62         ps.DataSource = ds.Tables[0].DefaultView;
63         ps.AllowPaging = true;
64         ps.PageSize =5;
65         ps.CurrentPageIndex = CurrentPage - 1;//取得当前页面的页码
66         lnkbtnFirst.Enabled = true;
67         lnkbtnFront.Enabled = true;
68         lnkbtnNext.Enabled = true;
69         lnkbtnLast.Enabled = true;
70         if (CurrentPage == 1)
71         {
72             lnkbtnFirst.Enabled = false;//不显示首页按钮
73             lnkbtnFront.Enabled = false;//不显示第上一页按钮
74         }
75         if (CurrentPage == ps.PageCount)
76         {
77             lnkbtnLast.Enabled = false;//不显示最后一页按钮
78             lnkbtnNext.Enabled = false;//不显示下一页按钮
79         }
80         labCount.Text = Convert.ToString(ps.PageCount);
81         DL.DataSource = ps;
82         DL.DataBind();
83     }
84
85     protected void returnIndex_Click(object sender, ImageClickEventArgs e)
86     {
87         Response.Redirect("~/VoteIndex.aspx");
88     }
89     protected void lnkbtnFirst_Click(object sender, EventArgs e)   //单击首页时，显示当前页为第一页
90     {
91         labNowPage.Text = "1";
92         Bind();
93     }
94     protected void lnkbtnFront_Click(object sender, EventArgs e)  //单击上一页时，当前页减1
95     {
96         labNowPage.Text = Convert.ToString(Convert.ToInt32(labNowPage.Text)-1);
97         Bind();
98     }
99     protected void lnkbtnNext_Click(object sender, EventArgs e)  //单击下一页，当前页加1
100     {
101         labNowPage.Text = Convert.ToString(Convert.ToInt32(labNowPage.Text) + 1);
102         Bind();
103     }
104     protected void lnkbtnLast_Click(object sender, EventArgs e)
105     {
106         labNowPage.Text = labCount.Text;
107         Bind();
108     }
109 }
110

选择投票选项：

界面如下：

前台代码

代码

  1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Vote.aspx.cs" Inherits="Vote" %>
  2
  3
  4
  5 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  6
  7 <html xmlns="http://www.w3.org/1999/xhtml" >
  8 <head runat="server">
  9     <title>无标题页</title>
10 </head>
11 <body>
12     <form id="form1" runat="server">
13     <div>
14         <table style="width:800px; height:400px"   cellspacing="0">
15     <tr>
16
17         <td style="width:189px; background-image: url(image/login_1.gif);">
18         </td>
19          <td style="background-image: url(image/login_2.gif)">
20            <table style="width:400px;  height:400px;">
21             <tr >
22                 <td style="width:100px;"></td>
23                 <td style="width:200px;"></td>
24                  <td style="width:100px;"></td>
25             </tr>
26              <tr >
27                 <td style="width:100px;"></td>
28                 <td style="width:200px;"></td>
29                  <td style="width:100px;"></td>
30             </tr>
31              <tr >
32                 <td style="width:100px; height: 32px;"></td>
33                 <td style="width:200px; height: 32px;"></td>
34                  <td style="width:100px; height: 32px;">
35                      <asp:ImageButton ID="returnIndex" runat="server" ImageUrl="~/image/ruturnIndex.gif" OnClick="returnIndex_Click" /></td>
36             </tr>
37              <tr >
38                 <td style="width:100px;">
39                     </td>
40                 <td style="width:200px;">
41                      还等什么!赶快投票吧!</td>
42                  <td style="width:100px;">
43                      </td>
44             </tr>
45              <tr >
46                 <td style="width:100px; height: 34px;">
47
48                     </td>
49                 <td style="width:200px; height: 34px;"><asp:Label ID="lbvoteTitle" runat="server" Text="Label"></asp:Label>
50                     </td>
51                  <td style="width:100px; height: 34px;"></td>
52             </tr>
53              <tr >
54                 <td style="width:100px; height: 34px;"></td>
55
56
57                 <td style="width:200px; height: 34px;">
58                     <asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChanged">
59                     </asp:CheckBoxList>
60                     </td>
61                  <td style="width:100px; height: 34px;"></td>
62             </tr>
63              <tr >
64                 <td style="width:100px;"></td>
65                 <td style="width:200px;">
66                     <asp:Label ID="checkresult" runat="server"></asp:Label>
67                 </td>
68                  <td style="width:100px;"></td>
69             </tr>
70              <tr >
71                 <td style="width:100px;"></td>
72                 <td style="width:200px;">
73                       <table>
74                       <tr>
75                          <td style="width: 139px; height: 39px;">
76                              <asp:ImageButton ID="imbVote" runat="server" ImageUrl="~/image/Vote.gif" OnClick="imbVote_Click" />
77                          </td>
78                          <td style="width: 174px; height: 39px;">
79                           <asp:ImageButton ID="imbResult" runat="server" ImageUrl="~/image/checkresult.gif" OnClick="imbResult_Click" />
80                          </td>
81
82                       </tr>
83
84                    </table>
85
86                 </td>
87                  <td style="width:100px;"></td>
88             </tr>
89              <tr >
90                 <td style="width:100px;"></td>
91                 <td style="width:200px;"></td>
92                  <td style="width:100px;"></td>
93             </tr>
94              <tr >
95                 <td style="width:100px;"></td>
96                 <td style="width:200px;"></td>
97                  <td style="width:100px;"></td>
98             </tr>
99              <tr >
100                 <td style="width:100px;"></td>
101                 <td style="width:200px;"></td>
102                  <td style="width:100px;"></td>
103             </tr>
104            </table>
105
106
107
108
109         </td>
110          <td style="width:200px; background-image: url(image/login_3.gif);">
111          </td>
112     </tr>
113
114 </table></div>
115     </form>
116 </body>
117 </html>
118

.cs后台代码，实现过程主要通过投票Id和投票项进行读取票数

代码

1 using System;
2 using System.Data;
3 using System.Configuration;
4 using System.Collections;
5 using System.Web;
6 using System.Web.Security;
7 using System.Web.UI;
8 using System.Web.UI.WebControls;
9 using System.Web.UI.WebControls.WebParts;
10 using System.Web.UI.HtmlControls;
11
12 public partial class Vote : System.Web.UI.Page
13 {
14     BaseDb obj = new BaseDb();
15   static  int VoteItemID = 0;
16     protected void Page_Load(object sender, EventArgs e)
17     {
18        VoteItemID = Convert.ToInt32(Request["Voteid"]);
19         if (!IsPostBack)
20         {
21
22             labBind();
23             cblBind();
24         }
25
26
27     }
28
29     #region  对投票主题进行绑定
30     public void labBind()
31     {
32         DataSet ds = obj.getdatabydataset("select voteItem from VoteItem where VoteItem_id = " + "'" + VoteItemID + "'");
33         lbvoteTitle.Text = ds.Tables[0].Rows[0][0].ToString();
34     }
35
36     #endregion
37
38     #region
39
40     public void cblBind()
41     {
42         DataSet ds = obj.getdatabydataset("select VoteSelect_id,Voteselect from VoteSelect where VoteItem_id = " + "'" + VoteItemID + "'");
43         CheckBoxList1.DataSource = ds;
44         CheckBoxList1.DataTextField = "VoteSelect";
45         CheckBoxList1.DataValueField = "VoteSelect_id";
46         CheckBoxList1.DataBind();
47
48     }
49     #endregion
50     protected void returnIndex_Click(object sender, ImageClickEventArgs e)
51     {
52         Response.Redirect("~/VoteIndex.aspx");
53     }
54     protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
55     {
56         int index;
57         string checkedrusult = "你已经选择了：";
58         for (index = 0; index < CheckBoxList1.Items.Count; index++)
59         {
60             if (CheckBoxList1.Items[index].Selected)
61             {
62                 checkedrusult +=" " +CheckBoxList1.Items[index].Text;
63
64             }
65             checkresult.Text = checkedrusult;
66         }
67
68
69     }
70     protected void imbVote_Click(object sender, ImageClickEventArgs e)
71     {
72         int VoteSelectid = 0;//获取被选择的投票项ID
73         int index ;//索引
74
75         for (index =0; index < CheckBoxList1.Items.Count; index++)
76         {
77             if (CheckBoxList1.Items[index].Selected)
78             {
79                 VoteSelectid = Convert.ToInt32(CheckBoxList1.Items[index].Value.ToString());
80                 obj.ExecuteSql("update VoteSelect set  VoteCount = VoteCount+1 where VoteSelect_id = " + VoteSelectid + " " + "and" + " " + "VoteItem_id=" + VoteItemID);
81
82             }
83         }
84
85     }
86     protected void imbResult_Click(object sender, ImageClickEventArgs e)
87     {
88         Response.Redirect("~/VoteResult.aspx?VoteID="+VoteItemID );
89     }
90 }
91

3投票结果

后台代码：如下：

代码

1 using System;
2 using System.Data;
3 using System.Configuration;
4 using System.Collections;
5 using System.Web;
6 using System.Web.Security;
7 using System.Web.UI;
8 using System.Web.UI.WebControls;
9 using System.Web.UI.WebControls.WebParts;
10 using System.Web.UI.HtmlControls;
11
12 public partial class VoteResult : System.Web.UI.UserControl
13 {
14     int VoteItemID =0;
15     BaseDb obj = new BaseDb();
16     protected void Page_Load(object sender, EventArgs e)
17     {
18         VoteItemID = Convert.ToInt32(Request["VoteID"]);
19         Response.Write(GetResult());
20
21     }
22
23     #region 获取当前投票主题的总票数
24
25     public decimal GetAllCount()
26     {
27       decimal TotalCount = 0;//总票数；
28       int index;
29
30         //DataSet ds = obj.getdatabydataset("SELECT sum(VoteCount)   FROM VoteSelect where VoteItem_id = " + VoteItemID   );
31         DataSet ds = obj.getdatabydataset( " Select VoteCount from VoteSelect where VoteItem_id = " + VoteItemID);
32         for (index = 0; index < ds.Tables[0].Rows.Count; index++)
33         {
34             TotalCount += Convert.ToDecimal(ds.Tables[0].Rows[index][0].ToString());
35         }
36
37
38
39         return TotalCount;
40     }
41 #endregion
42
43
44
45     #region
46     public string GetResult()
47     {
48
49         decimal VoteCountPercent;//获取数据的百分比
50         decimal VoteCounts;//获取数据的票数
51         string VoteSelects;//获得投票项
52         int index;
53         string   strBody = "<body style=text-align:center><table width=60% border=1 cellpadding=0 cellspacing=0 text-align:center>\n";
54         string strPercent;
55         DataSet ds = obj.getdatabydataset("select VoteSelect,VoteCount from VoteSelect where VoteItem_id = " + VoteItemID);
56       decimal TotalCounts = GetAllCount();
57
58         for (index = 0; index < ds.Tables[0].Rows.Count; index++)
59         {
60             VoteSelects  = ds.Tables[0].Rows[index][0].ToString();
61             VoteCounts  = Convert.ToDecimal(ds.Tables[0].Rows[index][1]);
62           VoteCountPercent  = GetPercent(VoteCounts ,TotalCounts )*100;
63
64             strPercent = VoteCountPercent.ToString();
65             if (strPercent.Length > 5)  //如果百分比的长度大于5的话，截取为00.00
66             {
67                 strPercent = strPercent.Substring(0,5);
68             }
69             strBody += "<tr><td width=100 style=font-size:9pt;text-align:center>" +  VoteSelects  + "</td><td width=50 style=font-size:9pt;color=red;text-align:center>" + VoteCounts + "票</td><td style=font-size:9pt><img src=image/bar1.gif height=10 width=" + strPercent + "%>" + strPercent + "%</td></tr>\n";
70         }
71         strBody += "</table></body>";
72         return strBody;
73
74     }
75     #endregion
76
77     #region 获得百分比
78     public decimal GetPercent(decimal VoteCount, decimal TotalCounts)
79     {
80         if (TotalCounts == 0)
81         {
82             TotalCounts++;//防止除0
83
84         }
85
86         return VoteCount / TotalCounts;
87     }
88
89
90     #endregion
91
92 }
93

以上是投票系统的第二部分，以下是我的一些经验。

投票系统碰到的问题：

问题1：用户id的获取？

先通过博客id获得用户id

页面布局：用表格

问题二：

单击添加时，出现如下错误：

解决方法：原因是数据库中的表名不一致。

数据库内容不一样：

两个表的VoteItem_id 不一致。为什么？

这两个表的

原因为，在获取投票主题Id的时候，函数如下：

public int AutoID(string tableName, string colName)

{

int voteValueID = 0;

string voteValueID1= "";

try

{

DataSet ds = obj.getdatabydataset("select Max(" + colName + ")from" + " " + tableName);

voteValueID1 = ds.Tables[0].Rows[0][0].ToString();

}

catch (Exception ee)

{

Response.Write("<script>alert('" + ee.Message + "');</script>");

}

Response.Write(voteValueID1);

return voteValueID;

}

问题出现在红字体缺少空格/导致数据读不出来、

数据库语句问题：

obj.ExecuteSql("delete from VoteSelect where VoteSelect=" +"'" + voteSelect + "'");

删除某一行是一定要写成如上格式。最重要的是蓝色字体不能没有。

还有若sql语句有字符串变量时，一定要给他加“‘” + 变量 +“’” 不然运行不了。

布局问题：

控件之间无法对齐

删除数据项时数据显示不出来，的一个原因是找不到用户Id

总结：编程时，要注意各中细节。

问题：代码执行后VoteCount出现重复累加；

for (index =0; index < CheckBoxList1.Items.Count; index++)

{

VoteSelectid =Convert.ToInt32(CheckBoxList1.SelectedValue.ToString());有问题。

obj.ExecuteSql("update VoteSelect set VoteCount = VoteCount+1 where VoteSelect_id = " +VoteSelectid +" "+ "and" +" " + "VoteItem_id=" + VoteItemID );

}

解决方法，多加一个判断条件：

if (CheckBoxList1.Items[index].Selected)

{

VoteSelectid = Convert.ToInt32(CheckBoxList1.Items[index].Value.ToString());

obj.ExecuteSql("update VoteSelect set VoteCount = VoteCount+1 where VoteSelect_id = " + VoteSelectid + " " + "and" + " " + "VoteItem_id=" + VoteItemID);

}

在进行插入数据项是，要同时把投票项的票数置0。不然将会出现投票数不会自动增加如图:

解决方法：在插入投票选项时，同时置投票项的票数置0；

出现上面的原因：

另外的解决办法是将投票的票数全部取出来，然后再进行累加。

posted on 2010-04-11 22:42 wtq 阅读(1238) 评论(0) 编辑收藏举报