c# - Cant Find Control Windows Phone 8.1 UAP -


i trying find control under xaml in hub control of windows phone 8.1. may case method works fine on desktop have testest in wpf before porting windows phone , may not work same.

<grid>     <hub header="lists" name="mainhub" >         <hubsection minwidth="600" name="lattestlists" header="new lists">             <datatemplate>                 <grid>                     <listbox background="transparent" margin="6" height="auto" borderthickness="2" maxheight="580" grid.row="1" x:name="listboxobj"  >                         <listbox.itemtemplate>                             <datatemplate>                                 <grid width="350" >                                     <border margin="5" borderbrush="white" borderthickness="1">                                         <grid>                                             <grid.rowdefinitions>                                                 <rowdefinition height="auto"/>                                                 <rowdefinition height="auto"/>                                             </grid.rowdefinitions>                                             <textblock margin="5,0,0,0" grid.row="0" x:name="nametxt" textwrapping="wrap" text="{binding name}" fontsize="28" foreground="white"/>                                             <textblock grid.row="0" text=">" fontsize="28"  horizontalalignment="right" verticalalignment="center" foreground="white"/>                                             <textblock margin="5,0,0,0" grid.row="1" x:name="phonetxt"  textwrapping="wrap" foreground="white" fontsize="18" text="{binding phonenumber}" />                                             <textblock horizontalalignment="right" margin="0,0,35,0" grid.row="3" x:name="createddatetxt" foreground="white" fontsize="18" textwrapping="wrap" text="{binding creationdate}" />                                         </grid>                                     </border>                                 </grid>                             </datatemplate>                         </listbox.itemtemplate>                     </listbox>                 </grid>             </datatemplate>         </hubsection>          <hubsection header="tech" isheaderinteractive="true"              background="#222222" minwidth="250">             <datatemplate>                 <stackpanel>                     <textblock text="tech news goes here."                        style="{themeresource bodytextblockstyle}" />                     <textblock text="click header go tech page."                        style="{themeresource bodytextblockstyle}" />                 </stackpanel>             </datatemplate>         </hubsection>          <hubsection header="sports" isheaderinteractive="true"             background="#444444" minwidth="250">             <datatemplate>                 <stackpanel>                     <textblock text="sports news goes here."                        style="{themeresource bodytextblockstyle}" />                     <textblock text="click header go sports page."                        style="{themeresource bodytextblockstyle}" />                 </stackpanel>             </datatemplate>         </hubsection>     </hub>  </grid>

i trying use following method find lsitbox not working 

      listbox listboxobjc = findchildcontrol<listbox>(this, "listboxobj") listbox;         listboxobjc.itemssource = db_contactlist.orderbydescending(i => i.id).tolist();//binding db data listbox , latest contact id can display first.

this method findchildcontrol 

  private dependencyobject findchildcontrol<t>(dependencyobject control, string ctrlname)     {         int childnumber = visualtreehelper.getchildrencount(control);         (int = 0; < childnumber; i++)         {             dependencyobject child = visualtreehelper.getchild(control, i);             frameworkelement fe = child frameworkelement;             // not framework element or null             if (fe == null) return null;              if (child t && fe.name == ctrlname)             {                 // found control return                 return child;             }             else             {                 // not found - search children                 dependencyobject nextlevel = findchildcontrol<t>(child, ctrlname);                 if (nextlevel != null)                     return nextlevel;             }         }         return null;   }

edit debuged code , showing control null though have done same way would

i have replace method find children couple of times during different versions of windows phone / windows runtime 1 being reliable. in case you're not able spot mistake try 1 , see if yields better results:

public t findelementbyname<t>(dependencyobject element, string schildname) t : frameworkelement     {         t childelement = null;         var nchildcount = visualtreehelper.getchildrencount(element);         (int = 0; < nchildcount; i++)         {             frameworkelement child = visualtreehelper.getchild(element, i) frameworkelement;              if (child == null)                 continue;              if (child t && child.name.equals(schildname))             {                 childelement = (t)child;                 break;             }              childelement = findelementbyname<t>(child, schildname);              if (childelement != null)                 break;         }         return childelement;     }

also when using method shortly after creating / loading content call updatelayout beforehand:

this.updatelayout();

but careful - not 1 of performance-friendliest methods (see also: https://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.uielement.updatelayout).


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