WPF Data binding: CollectionViewSource and ObjectDataProvider issue -

i have mainwindow.xaml file:

<window.resources>    <collectionviewsource x:key="cvs"      source="{binding source={staticresource resourcekey=detailscollection}}" />    <collectionviewsource x:key="detailscopes">     <collectionviewsource.source>       <objectdataprovider          methodname="getvalues"          objecttype="{x:type system:enum}">         <objectdataprovider.methodparameters>           <x:type typename="entities:detailscope" />         </objectdataprovider.methodparameters>       </objectdataprovider>     </collectionviewsource.source>   </collectionviewsource>    <datatemplate x:key="accountdetail"     datatype="{x:type entities:accountdetail}">     <dockpanel>       <combobox          dockpanel.dock="left"          itemssource="{binding source={staticresource resourcekey=detailscopes}}"          selecteditem="{binding path=scope}">         <combobox.itemtemplate>           <datatemplate>             <textblock                text="{binding converter={staticresource detailscopeconverter}}" />           </datatemplate>         </combobox.itemtemplate>       </combobox>       <textbox text="{binding path=value}" />     </dockpanel>   </datatemplate>  </window.resources>  ...  <listbox    itemtemplate="{staticresource resourcekey=accountdetail}"    itemssource="{binding source={staticresource resourcekey=cvs}}" /> 

and code-behind class, defined filter detail scopes:

public class mainwindow {     public mainwindow()     {         collectionviewsource detailscopes;          initializecomponent();          // attach filter collection view source         detailscopes = this.resources["detailscopes"] collectionviewsource;         detailscopes.filter += new filtereventhandler(detailscopesfilter);          private void detailscopesfilter(object sender, filtereventargs e)         {             detailscope scope;              scope = (detailscope)e.item;             if (scope == detailscope.private ||                 scope == detailscope.business)             {                 e.accepted = true;             }             else             {                 e.accepted = false;             }         }     } } 

next, there's accountdetail class:

public class accountdetail {   public string value   {     { return this.value; }     set { this.value = value; }   }   public detailscope scope   {     { return scope; }     set { scope = value; }   }    private string value;   private detailscope scope; } 

finally, enum:

public enum detailscope {   private,    business,    other } 

when run code, list box populated bunch of account details, each having own combo box selected scope , text box appropriate value. problem selected values in combo boxes match scope set last entered detail , changing of combo box values updates of them, if bound same account detail.

when take out objectdataprovider collectionviewsource detailscopes , bind directly combo box's itemssource in datatemplate accountdetail, problem gone. however, need inside collectionviewsource because applying filtering , cannot apply filtering objectdataprovider.

could please explain why happening , how supposed connect collectionviewsource , objectdataprovider? thank you.

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the problem code every combobox using same instance of collectionviewsource; means, resource key "detailscopes" shared all combobox, whenever select 1 value particular combobox, automatically selects same value in combobox. it's because underlying collection shared, keeps track of selected item, , since changes on selecting 1 combobox, collectionviewsource notifies change combobox.

so solution simple. need make detailscopes resource unsharable.

here fix:

<!-- please note x:shared="false" after x:key="detailsscopes" --->  <collectionviewsource x:key="detailscopes"  x:shared="false">      <collectionviewsource.source>       <objectdataprovider          methodname="getvalues"          objecttype="{x:type system:enum}">         <objectdataprovider.methodparameters>           <x:type typename="entities:detailscope" />         </objectdataprovider.methodparameters>       </objectdataprovider>     </collectionviewsource.source>   </collectionviewsource> 

hope solves problem!

however, solution cause problem. let me quote msdn, you'll understand x:shared does.

x:shared attribute

when set false, modifies wpf resource-retrieval behavior requests attributed resource create new instance each request instead of sharing same instance requests.

since x:shared causes create new instance (a new copy) of resource whenever attempt access it, means, filter handler method attached instance in code-behind, not instances.

so in order work handler properly, need attach handler xaml itself, this:

<!-- please note filter="detailsscopesfilter" --->  <collectionviewsource x:key="detailscopes"  x:shared="false"  filter="detailscopesfilter">      <collectionviewsource.source>       <objectdataprovider          methodname="getvalues"          objecttype="{x:type system:enum}">         <objectdataprovider.methodparameters>           <x:type typename="entities:detailscope" />         </objectdataprovider.methodparameters>       </objectdataprovider>     </collectionviewsource.source>   </collectionviewsource> 

hope solves problems. let me know if still face any.:-)

oh way, following code-behind not needed anymore. please remove it.

    // attach filter collection view source     detailscopes = this.resources["detailscopes"] collectionviewsource;     detailscopes.filter += new filtereventhandler(detailscopesfilter); 

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