DataList嵌套DataList的实现

        数据服务控件的嵌套最主要的是是内层控件数据的加载和事件的触发。 DataList嵌套的重点是要在外层DataList的ItemDataBound事件中用e.Item.FindControl方法来找到嵌套层DataList的id,编写嵌套层DataList的绑定数据源事件。下面以两层DataList为例介绍下实现的过程。效果如下图：



---------前台html代码-------

< 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 ="可查看到更多相关内容" >< img  src ='<%#PageBase.strStyleRoot+"/picture/more.gif"% > ' width="34" height="11" border="0"> </ a ></ td >
                         </ tr >
                     </ table >
                 </ td >
             </ tr >
         </ table >
     </ ItemTemplate >
</ asp:datalist >

--------后台cs代码------
内层控件数据绑定与事件声明在外层的ItemDataBind中实现

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();
              }
        }