c# - WPF binding to a Usercontrol and getting an error -

im starting wpf, sorry if cant explain well, , have hours trying solve how bind collection custom grid named pagingdatagrid.

the pagingdatagrid in customersearchcontrol binding griditems itemssource, when excecute searchcommand griditems gets updated nothing else changes.

i following error:

system.windows.data error: 40 : bindingexpression path error: 'griditems' property not found on 'object' ''pagingdatagridviewmodel' (hashcode=54151655)'. bindingexpression:path=griditems; dataitem='pagingdatagridviewmodel' (hashcode=54151655); target element 'pagingdatagrid' (name='me'); target property 'itemssource' (type 'ienumerable') 

customersearchcontrol:

<usercontrol x:class="namespace.customersearchcontrol"              ... >     <control.datacontext>         <binding path="customersearchviewmodel" ... />     </control.datacontext>     <dockpanel lastchildfill="true">         <groupbox header="registros">             <controls:pagingdatagrid itemssource="{binding griditems}" height="300" />         </groupbox>     </dockpanel> </usercontrol>   public class customersearchviewmodel : viewmodelbase {     public observablecollection<griditem> griditems{ get; set; }     public icommand searchcommand { get; set; }      public customersearchviewmodel()     {         griditems = new observablecollection<griditem>();         searchcommand = new relaycommand(searchentities, () => true);     } } 

pagingdatagrid:

<usercontrol x:class="namespace.pagingdatagrid" x:name="me"              ... >     <usercontrol.datacontext>         <binding path="pagingdatagridviewmodel" ... />     </usercontrol.datacontext>     <grid>        ...         <xcdg:datagridcontrol              itemssource="{binding elementname=me, path=itemssource}" grid.row="0"/>     </grid> </usercontrol>   public partial class pagingdatagrid : usercontrol {     public static readonly dependencyproperty itemssourceproperty         = dependencyproperty.register("itemssource", typeof(ienumerable), typeof(pagingdatagrid),         new propertymetadata(default(ienumerable)));      public ienumerable itemssource     {         { return (ienumerable)getvalue(itemssourceproperty); }         set { setvalue(itemssourceproperty, value); }     } } 

you need declare instance of customersearchviewmodel in xaml , bind datacontext.

this how it:

<usercontrol.datacontext>    <local:customersearchviewmodel/> </usercontrol.datacontext> 

make sure declare namespace local @ root i.e. @ usercontrol:

xmlns:local="clr-namespace:wpfapplication" <-- replace wpfapplication                                              actual namespace of viewmodel. 

not needed since getting instance servicelocator.

---

and binding griditems need bind explicitly customersearchcontrol datacontext using relativesource. needed because have explicitly set datacontext on pagingdatagrid pagingdatagridviewmodel. so, search griditems property in pagingdatagridviewmodel instead of customersearchviewmodel.

<controls:pagingdatagrid itemssource="{binding datacontext.griditems,             relativesource={relativesource mode=findancestor,                                 ancestortype=usercontrol}}"/> 

or can give x:name customersearchcontrol , bind using elementname.