DataList嵌套DataList的實現

        資料服務控制項的嵌套最主要的是是內層控制項資料的載入和事件的觸發。 DataList嵌套的重點是要在外層DataList的ItemDataBound事件中用e.Item.FindControl方法來找到嵌套層DataList的id,編寫嵌套層DataList的綁定資料來源事件。下面以兩層DataList為例介紹下實現的過程。效果如：

---------前台html代碼-------<asp:datalist id="dlFileType" RepeatColumns="2" runat="server">
    <ItemTemplate>
        <table border="0" cellspacing="0" cellpadding="0">
            <tr>
                <td width="22%" height="88" align="center" valign="top">
                    <img src='<%#DataBinder.Eval(Container.DataItem, "cnvcPicURL")%>' width="80"  height="80">
                </td>
                <td valign="top">
                    <table width="96%" border="0" cellpadding="0" cellspacing="0">
                        <tr width="100%">
                            <td colspan="2"><img src='<%#PageBase.strStyleRoot+"/picture/pic_fwzn_08.gif"%>'  height="20"><%#DataBinder.Eval(Container.DataItem, "cnvcTitle")%>
                                <asp:Label id="labFileType" runat="server" Visible=False Text='<%# DataBinder.Eval(Container.DataItem,"cniFileTypeID")%>'>
                                </asp:Label></td>
                        </tr>
                        <tr>
                            <td width="300">
                                <asp:DataList id="dlFileList" runat="server" RepeatColumns="1" Width="100%">
                                    <ItemTemplate>
                                        <TABLE cellSpacing="1" cellPadding="1" width="100%" border="0">
                                            <tr>
                                                <td width="7%" height="20" align="center">
                                                    <img src='<%#PageBase.strStyleRoot+"/picture/pic_fwzn_dot.gif"%>' width="3" height="3"></td>
                                                <td width="93%">
                                                    <font color="#393939">
                                                        <%#GetTitle((string)Convert.ToString(DataBinder.Eval(Container.DataItem, "cnvcTitle")),(string)Convert.ToString(DataBinder.Eval(Container.DataItem, "cnvcFileType")),(string)Convert.ToString(DataBinder.Eval(Container.DataItem, "cniBaseFileID")),(DateTime)DataBinder.Eval(Container.DataItem, "cndtPublishTime"))%>
                                                    </font>
                                                </td>
                                            </tr>
                                        </TABLE>
                                    </ItemTemplate>
                                </asp:DataList>
                            </td>
                        </tr>
                        <tr>
                            <td colspan="2" bgcolor="E6E6E6" height="1"><img src='<%#PageBase.strStyleRoot+"/picture/1X1.gif"%>' width="1" ></td>
                        </tr>
                        <tr align="center">
                            <td height="22" colspan="2"><a href="#" title="可查看到更多相關內容"><img src='<%#PageBase.strStyleRoot+"/picture/more.gif"%>' width="34" height="11" border="0"></a></td>
                        </tr>
                    </table>
                </td>
            </tr>
        </table>
    </ItemTemplate>
</asp:datalist>

--------後台cs代碼------
內層控制項資料繫結與事件聲明在外層的ItemDataBind中實現

private void dlFileType_ItemDataBound(object sender, System.Web.UI.WebControls.DataListItemEventArgs e)
        {
                if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) 
            {
                  DataList   dl = null;
                 Label   labTypeID = null;
                
                 dl = (DataList)e.Item.FindControl("dlFileList")
                labTypeID = (Label)e.Item.FindControl("lbFileType");

                string typeID = labTypeID.Text.ToString();
　　　    int iTypeID = Convert.ToInt32(typeID);

　　　　string commandText = "select * from tbfile";
　　　　commandText = commandText + " Where TypeID=" + iTypeID;
　　　　//------------
　　　　string connString = ConfigurationSettings.AppSettings["dsn"];
                 SqlConnection conn = new SqlConnection();
　　　　conn.ConnectionString = connString;
　　　　conn.Open();
　　　　SqlDataAdapter  myCommand = new SqlDataAdapter(commandText,conn);
　　　　DataSet ds = new DataSet();
　　　　myCommand .Fill(ds,"tbFile");
　　　　conn.Close();
　　　　//------------

                 dl.DataSource = ds.Tables["tbFile"];;
                 dl.DataBind();
              }
        }