Can you selectively enable or disable 'FilterDescriptors' in silverlight 4?

Question

In Silverlight with RIA services it is very easy to implement simple data filtering with 'FilterDescriptor' instances.

However I've got a case where I have several filters and I want to enable or disable them based on other filters.

It seems like a simple 'Enabled' property would make this really easy - but there is none.

Is there a way to achieve this without just manually defining all the filters I need every time the relevant checkbox is checked. Perhaps a subclass? (I haven't had time to try this myself yet)

Answer 1

Sorting / Filtering / Grouping is really will be easy with using "RIA Services DataFilter Control for Silverlight". http://riadatafilter.codeplex.com/

Answer 2

I am doing this by setting each one to -1 by default, and have the IgnoredValue="-1" in the FilterDescriptor. You can also use null or Nothing depending on your language your using. Ken

Answer 3

Ok, here is what I do. I reset the filter, then set them, you can loop thru them and set them to anything you like...

Private Sub AppPickerComboBox_SelectionChanged(ByVal sender As System.Object, ByVal e As System.Windows.Controls.SelectionChangedEventArgs) Handles AppPickerComboBox.SelectionChanged
    For fd As Integer = AppTranDomainDataSource.FilterDescriptors.Count - 1 To 0 Step -1
        If AppTranDomainDataSource.FilterDescriptors(fd).PropertyPath = "Application_ID" Then
            AppTranDomainDataSource.FilterDescriptors.Remove(AppTranDomainDataSource.FilterDescriptors(fd))
        End If
    Next fd
    AppTranDomainDataSource.FilterDescriptors.Add(New FilterDescriptor With {.PropertyPath = "Application_ID", .Operator = FilterOperator.IsEqualTo, .Value = AppPickerComboBox.SelectedValue, .IgnoredValue = -1})
End Sub