前台页面：

<asp:GridView ID="GvMenu" runat="server" AutoGenerateColumns="False"
onrowdatabound="GvMenu_RowDataBound" DataKeyNames="moduleNo"
GridLines="None" ShowHeader="false">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<h1 class="type"><a href="javascript:void(0)"><asp:Label ID="LbMenu" runat="server" Text='<%# Bind("moduleName") %>'></asp:Label></a></h1>
<div class="content">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr><td><img src="images/menu_topline.gif" width="182" height="5" /></td></tr>
</table>
<ul class="MM">
<asp:DataList ID="DlMenu" runat="server" onitemdatabound="DlMenu_ItemDataBound" >
<ItemTemplate>
<asp:Panel id ="p<%#Eval("innerID")%>" runat="server">
<li><a href="<%#Eval("url")%>" target="right"><%#Eval("funcName")%></a>
</li>
<asp:HyperLink id="HlfuncNo" Text='<%# DataBinder.Eval(Container.DataItem, "funcNo") %>' runat="server" Visible="false" />
<asp:Literal ID="LtinnerID" runat="server" Text='<%#Eval("innerID")%>' Visible="false"></asp:Literal>
</asp:Panel>
</ItemTemplate>

</asp:DataList>
</ul>
</div>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

后台代码：

protected void DlMenu_ItemDataBound(object sender, DataListItemEventArgs e)
{

HyperLink hlfuncNo = (HyperLink)e.Item.FindControl("HlfuncNo");
string funcNo = hlfuncNo.Text.ToString();
//当前列表值：funcNo
//用户权限值：ViewState["user_priv"]
//if (hlfuncNo == null)
//{
// Response.Write("<script language='javascript'>alert('当前对象为空');" + hlfuncNo + "</script>");
//}
//else
//{

// Response.Write("<script language='javascript'>alert('当前列表值：" + Convert.ToInt32(ViewState["user_priv"].ToString()) + "');</script>");

//}
//Response.Write("<script language='javascript'>alert('123：');" + Convert.ToInt32(funcNo.ToString()) + "</script>");
int a = Convert.ToInt32(ViewState["user_priv"].ToString());//拥有的值
int b = Convert.ToInt32(funcNo.ToString()); //当前列表值：
int c = a & b;
Literal Ltmenuid = (Literal)e.Item.FindControl("LtinnerID");
string menuid = Ltmenuid.Text.ToString(); //找到当前列表ID;
if (c != b)
{
//menuid.Style["Display"] = "None"; //隐藏;

Control p = e.Item.FindControl('p'+menuid );
// p.Visible = false;

//隐藏<li>
}
//获得li的ID
//判断是否为真
//是否隐藏
}

Control p = e.Item.FindControl('p'+menuid );这个方法找不到如终找不到页面那个asp:Panel 控件，如果把页面asp:Panel 控件ID值写成固定的就能找到，不知道是什么原因？请高手给看看啊！