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获取不到Repeater控件中的CheckBox选中状态

写在前面的话:在做一个项目的时候,需要使用到Repeater控件,并且在Repeater控件内放置了CheckBox控件来标志需要删除的行,选中后,在后台取到的CheckBox的值总是为false。最后发现是在PageLoad函数中没有判断是否是回发就绑定了Repeater控件的数据,那么每次进入页面CheckBox控件的值当然被刷新为false了。

前台页面:

 1 <div class="contianer p10">
 2         <h3>
 3             当前位置:<a href="Index.aspx" target="_self" >首页</a>>文章管理</h3>
 4         <hr/>
 5         <div class="content">         
 6                 <asp:repeater ID="rptArticle" runat="server" ClientIDMode="Static" >
 7                 <HeaderTemplate>
 8                 <table border="0" cellspacing="0" cellpadding="0" width="100%">
 9                     <tr>
10                         <th width="6%">选择</th>
11                         <th width="6%">编号</th>
12                         <th align="left">文章标题</th>
13                         <th width="16%">发布时间</th>
14                         <th width="10%">操作</th>
15                     </tr>
16                     </HeaderTemplate>
17                     <ItemTemplate>
18                         <tr>
19                             <td><asp:CheckBox ID="cb_id" CssClass="checkall" runat="server" /></td>
20                             <td><asp:Label ID="lb_id" runat="server" Text=‘<%#Eval("aNo")%>‘></asp:Label></td>
21                             <td><a href="ArticleShow.aspx?id=<%#Eval("aNo") %>"><%#Eval("aTitle")%></a></td>
22                             <td><%#string.Format("{0:g}", Eval("aDate"))%></td>
23                             <td><span><a href="ArticleShow.aspx?id=<%#Eval("aNo") %>">修改</a></span></td>
24                         </tr>
25                     </ItemTemplate>
26                     <FooterTemplate>
27                     </table>
28                     </FooterTemplate>
29                 </asp:repeater>
30         </div>
31         <div class="clear"></div>
32           <!-- 分页控件 -->
33           <div>
34             <webdiyer:AspNetPager ID="AspNetPager1" runat="server" HorizontalAlign="Right" ShowCustomInfoSection="Right"
35                 Width="100%" Style="font-size: 12px" inputboxstyle="width:19px" CustomInfoHTML=""
36                 ShowPageIndexBox="Always" AlwaysShow="false" FirstPageText="首页" LastPageText="尾页"
37                 NextPageText="下一页" PrevPageText="上一页" CustomInfoStyle="FONT-SIZE: 12px" CurrentPageButtonClass="pagination"
38                 PageSize="16" ForeColor="#1460AD" OnPageChanged="AspNetPager1_PageChanged">
39             </webdiyer:AspNetPager>
40           </div>
41           <!-- 分页控件end -->
42 
43         <br />
44         <asp:Button ID="BtnDelete" runat="server" 
45         OnClientClick="return confirm( ‘确定要删除这些记录吗? ‘);" 
46         onclick="BtnDelete_Click" Text="删除" />
47     &nbsp;
48         <asp:Label ID="lbMsg" runat="server" Text=""></asp:Label>
49         &nbsp;
50         <asp:Button ID="BtnAdd" runat="server" Text="添加" 
51             onclick="BtnAdd_Click"/>
52 
53     </div>

后台页面:

 1 ArticleBLL bll = new ArticleBLL();
 2         protected void Page_Load(object sender, EventArgs e)
 3         {
 4             this.lbMsg.Text = "";
 5             if (!IsPostBack)
 6             {
 7                 BindRepeater();
 8             }
 9         }
10         // 绑定数据
11         private void BindRepeater()
12         {
13             string strSql = "select * from article";
14 
15             PagedDataSource ps = new PagedDataSource();
16             ps.DataSource = bll.GetDataList(strSql).DefaultView;
17             AspNetPager1.RecordCount = ps.Count;
18             ps.CurrentPageIndex = AspNetPager1.CurrentPageIndex - 1;
19             ps.AllowPaging = true;
20             ps.PageSize = AspNetPager1.PageSize;
21             this.rptArticle.DataSource = ps;
22             this.rptArticle.DataBind();
23         }
24         // 分页控件事件绑定
25         public void AspNetPager1_PageChanged(object sender, EventArgs e)
26         {
27             BindRepeater();
28         }
29         // 添加文章
30         protected void BtnAdd_Click(object sender, EventArgs e)
31         {
32             Response.Redirect("ArticleShow.aspx");
33         }
34         // 删除
35         protected void BtnDelete_Click(object sender, EventArgs e)
36         {
37             for (int i = 0; i < rptArticle.Items.Count; i++)
38             {
39                 int id = Convert.ToInt32(((Label)rptArticle.Items[i].FindControl("lb_id")).Text);
40                 CheckBox cb = (CheckBox)rptArticle.Items[i].FindControl("cb_id");
41                 if (cb.Checked)
42                 {
43                     bll.Delete(id.ToString());
44                 }
45             }
46             this.lbMsg.Text = "删除成功";
47         }

处理办法是在PageLoad里面判断是否是回发就可以了。