Xaml DelegateFilterDescriptor Filter binding

[Alexei]

Hi all,

Need some help with binding.

I have a page with following xaml:

 <Entry x:Name="ListFilter" />

....

<dataControls:RadListView x:Name="ItemsList" ItemsSource ="{Binding ItemsList}" >

...

     <dataControls:RadListView.FilterDescriptors>
              <listView:DelegateFilterDescriptor Filter="{Binding ....}"></listView:DelegateFilterDescriptor>
     </dataControls:RadListView.FilterDescriptors>

....

 

How could I write a binding for Filter (DelegateFilterDescriptor's property) to execute the contains predicate in xaml with parameter Entry's Text property. Equivalent to code behind expression:

ItemsList.FilterDescriptors.Add(new DelegateFilterDescriptor {Filter = (n)=>((Item)n).Name.Contains(ItemsList.Text)});

 

Thank you in advance.

Alexei

[Rosy Topchiyska]

Hello Alexei,

Thank you for contacting us.

This scenario is not supported. Adding a filter descriptor to the FilterDescriptors collection triggers the filtering once and any further changes in the descriptor are not regarded. You have to modify the FilterDescriptors collection to initiate new filtering. Generally, what you could do in this case is: clear the descriptors collection and add new descriptor every time the entry text is changed. I have attached an example.

I hope this helps.

Regards,
Rosy Topchiyska
Telerik by Progress