DataList、Repeater、GridView中的Checkbox取值问题

先看页面代码

 1 <asp:DataList id="DataList1" runat="server" Width="100%" RepeatColumns="4" Font-Size="10pt">
 2         <ItemTemplate>
 3          <TABLE id="Table2" cellSpacing="0" cellPadding="0" width="100%" bgColor="gainsboro" border="0">
 4           <TR>
 5            <TD align="center">
 6             <asp:Label id=lblOName runat="server" Font-Size="10pt" Text='<%# DataBinder.eval_r(Container.DataItem,"nmenu_name")%>'>
 7             </asp:Label>
 8             <asp:Label id=lblID runat="server" Font-Size="10pt" Text='<%# DataBinder.eval_r(Container.DataItem,"nmenu_id")%>' Visible="False">
 9             </asp:Label></TD>
10           </TR>
11           <TR>
12            <TD align="center">
13             <asp:CheckBoxList id="cbSelect" runat="server" Font-Size="10pt" RepeatColumns="2" Width="100%" BackColor="#FFE0C0"
14              RepeatDirection="Horizontal" DataTextField="nmenu_tname" DataValueField="nmenu_tid"></asp:CheckBoxList></TD>
15           </TR>
16          </TABLE>
17         </ItemTemplate>
18        </asp:DataList>

后台绑定CheckBox:

 1 private void Page_Load(object sender, System.EventArgs e)
 2   {
 3    // 在此处放置用户代码以初始化页面
 4    if(!IsPostBack)
 5    {
 6     if(Session["UID"]!=null&&Session["UID"].ToString()!="")
 7     {
 8      BindList();
 9      BindCheckBox();
10     }
11     else
12     {
13      Server.Transfer("error.aspx");
14     }
15    }
16   }
17 private void BindList()
18   {
19    string sql = "select * from NewsOne";
20    DataList1.DataSource = ort.ExecuteToTable(sql);
21    DataList1.DataBind();
22   }
23 private void BindCheckBox()
24   {
25    foreach(DataListItem dli in DataList1.Items)
26    {
27     CheckBoxList cbl = (CheckBoxList)dli.FindControl("cbSelect");
28     Label lbl = (Label)dli.FindControl("lblID");
29     string sql = "select * from NewsTwo where nmenu_oid="+lbl.Text;
30     cbl.DataSource = ort.ExecuteToTable(sql);
31     cbl.DataBind();
32    }
33   }

CheckBox取值：

 1 string list = "";
 2      foreach(DataListItem dli in DataList1.Items)
 3      {
 4       CheckBoxList cbSel = (CheckBoxList)dli.FindControl("cbSelect");
 5       for(int i=0;i<cbSel.Items.Count;i++)
 6       {
 7        if(cbSel.Items[i].Selected == true)
 8        {
 9         list += cbSel.Items[i].Value + ",";
10        }
11       }
12      }
13      list = list.Trim(",".ToCharArray());

有的时候会出现取不到值的情况，我的看法是缺少if(!IsPostBack)。