asp.net - Databinding on Custom Control with ITemplate -

this sample code of custom server control :

[designer(typeof(containercontroldesigner))] [toolboxdata("<{0}:blocarrondi runat=server><contenuprincipal></contenuprincipal></{0}:blocarrondi>")] public class blocarrondi : webcontrol {     private itemplate _contenuprincipal;     protected panel _panelcontenuprincipal = new panel();      public blocarrondi()     : base(htmltextwritertag.div)     {      }      [persistencemode(persistencemode.innerproperty)]     [templateinstance(templateinstance.single)]     public itemplate contenuprincipal     {             { return _contenuprincipal; }             set { _contenuprincipal = value; }     }      protected override void oninit(eventargs e)     {             base.oninit(e);             _panelcontenuprincipal.id = "panelprincipal";             this.controls.add(_panelcontenuprincipal);              if (_contenuprincipal != null)                     _contenuprincipal.instantiatein(_panelcontenuprincipal);     } } 

and here implementation :

<controls:blocarrondi runat="server">     <contenuprincipal>         <asp:label id="labelinfo" runat="server" />     </contenuprincipal> </controls:blocarrondi> 

my label labelinfo accessible on code behind, great !

but if use custom control in repeater or listview, can't use container.dataitem property inside contenuprincipal template :

<asp:repeater id="repeaterinfos" runat="server">     <itemtemplate>         <controls:blocarrondi runat="server">             <contenuprincipal>                 <asp:label runat="server" text="<%# (container.dataitem msginfo).displaymessage() " />             </contenuprincipal>         </controls:blocarrondi>     </itemtemplate> </asp:repeater> 

the error message :

'system.web.ui.control' not contain definition 'dataitem' , no extension method 'dataitem' accepting first argument of type 'system.web.ui.control' found (are missing using directive or assembly reference?)

how can use container.dataitem property inside contenuprincipal template of control ?

i solved problem custom templatecontainer inherit idataitemcontainer :

    public class blocarrondicontainer : panel, idataitemcontainer 

change :

    protected panel _panelcontenuprincipal = new panel();      [persistencemode(persistencemode.innerproperty)]     [templateinstance(templateinstance.single)]     public itemplate contenuprincipal     {         { return _contenuprincipal; }         set { _contenuprincipal = value; }     } 

by :

    protected blocarrondicontainer _panelcontenuprincipal = new blocarrondicontainer ();      [persistencemode(persistencemode.innerproperty)]     [templateinstance(templateinstance.single)]     [templatecontainer(typeof(blocarrondicontainer))]     public itemplate contenuprincipal     {         { return _contenuprincipal; }         set { _contenuprincipal = value; }     } 

overrinding ondatabinding method on blocarrondi class :

    protected override void ondatabinding(system.eventargs e)     {         if (namingcontainer idataitemcontainer)             _panelcontenuprincipal.dataitem = (namingcontainer idataitemcontainer).dataitem;          base.ondatabinding(e);     }