DataList中的Checkbox取值问题

先看页面代码

<asp:DataList id="DataList1" runat="server" Width="100%" RepeatColumns="4" Font-Size="10pt">

<ItemTemplate>

<TABLE id="Table2" cellSpacing="0" cellPadding="0" width="100%" bgColor="gainsboro" border="0">

<TR>

<TD align="center">

<asp:Label id=lblOName runat="server" Font-Size="10pt" Text='<%# DataBinder.eval_r(Container.DataItem,"nmenu_name")%>'>

</asp:Label>

<asp:Label id=lblID runat="server" Font-Size="10pt" Text='<%# DataBinder.eval_r(Container.DataItem,"nmenu_id")%>' Visible="False">

</asp:Label></TD>

</TR>

<TR>

<TD align="center">

<asp:CheckBoxList id="cbSelect" runat="server" Font-Size="10pt" RepeatColumns="2" Width="100%" BackColor="#FFE0C0"

RepeatDirection="Horizontal" DataTextField="nmenu_tname" DataValueField="nmenu_tid"></asp:CheckBoxList></TD>

</TR>

</TABLE>

</ItemTemplate>

</asp:DataList>

后台绑定CheckBox:

private void Page_Load(object sender, System.EventArgs e)

{

// 在此处放置用户代码以初始化页面

if(!IsPostBack)

{

if(Session["UID"]!=null&&Session["UID"].ToString()!="")

{

BindList();

BindCheckBox();

}

else

{

Server.Transfer("error.aspx");

}

}

}

private void BindList()

{

string sql = "select * from NewsOne";

DataList1.DataSource = ort.ExecuteToTable(sql);

DataList1.DataBind();

}

private void BindCheckBox()

{

foreach(DataListItem dli in DataList1.Items)

{

CheckBoxList cbl = (CheckBoxList)dli.FindControl("cbSelect");

Label lbl = (Label)dli.FindControl("lblID");

string sql = "select * from NewsTwo where nmenu_oid="+lbl.Text;

cbl.DataSource = ort.ExecuteToTable(sql);

cbl.DataBind();

}

}

CheckBox取值：

string list = "";

foreach(DataListItem dli in DataList1.Items)

{

CheckBoxList cbSel = (CheckBoxList)dli.FindControl("cbSelect");

for(int i=0;i<cbSel.Items.Count;i++)

{

if(cbSel.Items[i].Selected == true)

{

list += cbSel.Items[i].Value + ",";

}

}

}

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)。