wpf - How to switch between 2 data sources for ListBox.ItemsSource -

what best/elegant way bind itemscontrol.itemssource 2 different sources best on given property?

the binding should done 1 of 2 collection, selection collection itemscontrol bound should based on property.

i have view bound viewmodel. collections want bind located in different hierarchy path under viewmodel.

i've solution based on multibinding think there should more elegant solution.

<collectionviewsource x:key="cvs">       <collectionviewsource.source  >           <multibinding converter="{staticresource mymultibindingconverter}">               <binding  path="xxxx.yyyy.observablecollection1"  />               <binding path="xxxx.observablecollection2" />                               </multibinding>       </collectionviewsource.source>                             </collectionviewsource>  <listbox  x:name="mylistbox"                                              itemssource="{binding source={staticresource cvs}}" /> 

the converter:

public class mymultibindingconverter : imultivalueconverter {     public object convert(object[] values, type targettype, object parameter,         system.globalization.cultureinfo culture)     {          foreach (var item in values)         {             if(mydependecyproperty == getfirstcollection)             {               //make sure item of first collection type based on item property               return item;              }             else             {               //make sure item of second collection type               return item;             }          }         return null;     }      public object[] convertback(object value, type[] targettypes, object parameter,         system.globalization.cultureinfo culture)     {         throw new notimplementedexception();     } } 

a datatrigger more appropriate here since want change itemssource binding based on value

<style x:key="mylistboxstyle" targettype="listbox">     <setter property="itemssource" value="{binding xxx.observablecollection2}" />     <style.triggers>         <datatrigger binding="{binding somevalue}" value="secondcollection">             <setter property="itemssource" value="{binding xxx.yyy.observablecollection2}" />         </datatrigger>     </style.triggers> </style> 

unlike converter, datatrigger correctly re-evaluated whenever triggered value changes