[Solved] Filter by binding with a second GridView

[Bij]

Hey,

I have a Problem on Binding the filtered value in a RadGridView.
I have two UserControls with one GridView each in one Window (sharing DataContext -ObervableCollection<Element>-) and I would like to filter the entries in one of them (radGridView2), where the value to filter by is the value of the currently SelecteItem of the other GridView (radGridView1). How can I do this?
With the following code: 

In Element.cs:
class Element
{
    string Name;
}

In radGridView1.xaml:
...
<telerik:RadGridView x:Name="radGridView1" AutoGenerateColumns="False" ForceCursor="True" ItemSource="{Binding}" SelectedItem="Name"\>
    <telerik:RadGridView.Columns>
        <telerik:GridViewDataColumn ... DataMemberBinding="{Binding Name, UpdateSourceTrigger=PropertyChanged}" Header="Name" IsResizable="True">
    </telerik:RadGridView.Columns>
</telerik:RadGridView>

In radGridView2.xaml I would like to do something like this:
...
<telerik:RadGridView x:Name="radGridView2" ShowInsertRow="True" ItemSource="{Binding}"
    <telerik:RadGridView.FilterDescriptors>
        <telerik:RadGridView.FilterDescriptor Member="Name" Operator="IsEqualTo" Value="{Binding radGridView1.SelectedItem.Name}">
...

This is not compiling. Do you know, how I should do it?

Thanks,

Bij.M

Ps: I'm sorry, I cannot directly copy my code, but if it helps, I can retype the rest of it for you.

[Rossen Hristov]

Hi Bij,

Unfortunately FilterDescriptor is not a DependencyObject yet, but we have plans to make it one. Until then you should add the FilterDescriptor to the grid programatically. You can attach to the selection changed event of the first grid and when selection changes you can add/remove/edit the FilterDescriptor for the second grid.

I hope this helps. Let us know if there are problems.

Regards,
Ross
the Telerik team

[david mcintyre]

Hi Ross, can you provide me w/ a snippet on how to do this?  I have the same scenario and problem as Bij.  In the first grid's SelectionChanged event handler, i can't clear or remove the grid's filterdescriptors without getting a InvalidOperationException ("Cannot change observablecollection during a collecctionchanged or propertychanged event").  I can see how you can't change the filterdescriptors of the *first* grid, but i don't understand why it's preventing the change to another grid's filters. 

Update:  I remembered that observable collections trigger updates only when adding/removing members, so i can edit the filter descriptor's value.  Is this the best or only way to do this?

[Veselin Vasilev]

Hi david mcintyre,

Please find attached a sample project.

Kind regards,
Veselin Vasilev
the Telerik team