Advanced FilterDescriptor Question

[Brendon]

This is what I want to do... tell me if I'm crazy.

I would like to filter data based on a many to many relationship...
Lets say we have People, and Widgets that are tied together via PeopleWidgets.

If I have a grid of People and a column for their Widgets - is it possible to have a custom filtering control that lets them which Widgets to choose from. Actually - I've made it that far, but now the problem is getting the FilterDescriptor to behave as desired. This is what I have...

            List<long> widgetIDs = new List<long>();
            foreach (CheckBox checkBox in this.ChildrenOfType<CheckBox>().Where(cb => cb.IsChecked == true))
            {
                widgetIDs.Add((checkBox.DataContext as Widget).WidgetID);
            }
            if (widgetIDs.Count > 0)
            {
                Telerik.Windows.Data.FilterDescriptor fd = new Telerik.Windows.Data.FilterDescriptor();
                fd.Member = "PeopleWidgets.WidgetID";
                fd.Operator = Telerik.Windows.Data.FilterOperator.IsContainedIn;
                fd.Value = widgetIDs;

            }

But this is obviously not working. Basically I'm trying to go another level deeper in my "Member" property of the FilterDescriptor.

Any ideas?

[Brendon]

In case anyone else needs a workaround and this can't be done via the FilterDescriptor methods - my current workaround is to raise an event in the Custom Filter Control that is caught by the RadGridView and then uses a QueryParameter of the DomainDataSource to filter the results.

[Rossen Hristov]

Hello Brendon,

You can find my blog post interesting.

In the blog post I have developed a Custom Filtering Control that communicates directly with the DomainDataSource thus eliminating any client-side filtering. I guess you are trying something similar. Check it out, I am filtering on the server without any events whatsoever. My custom control simply "knows" about the
DomainDataSource and operates over it.

I hope this will help.

All the best,
Ross
the Telerik team

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