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。