Entity Framework Lists, Static Resources and Filtering a BindingListCollectionView

zx12a1

Hi my view model has a dependency property ActiveWellLocation which is an ADO.Net Entity framework object, wellLocation, which is associated with wellSample which has an associated list wellAliquot, so: ActiveWellLocation.wellSample.wellAliquot - is a collection and I can successfully bind to my datagrid

<dg:DataGrid x:Name="additivesDataGrid" HorizontalAlignment="Center" Margin="2" Width="302" Height="150"
AutoGenerateColumns="False"

ItemsSource="{Binding ActiveWellLocation.wellSample.wellAliquot}"
....
</dg:DataGrid>

I need to filter my wellAliquot collection and thus investigated indirecting thru a static resource. The following snippets of the CollectionViewSource and associated binding on the datagrid also bind ok:

with

lt;dg:DataGrid x:Name="additivesDataGrid" HorizontalAlignment="Center" Margin="2" Width="302" Height="150"
AutoGenerateColumns="False"
ItemsSource="{Binding Source={StaticResource WellAliquotsWithAdditives}}"
....
</dg:DataGrid

I was intending to filter the CollectionViewSource (of type BindingListCollectionView) as my dp ActiveWellLocation updates. In short my view model fires an event to which the user control listens. In the event handler I have tried a couple of different ways to get hold of the resource but they fail, one example was

    public void PropertyChangedListener(object sender, PropertyChangedEventArgs e)
    {
        string name = e.PropertyName;
        switch (name)
        {
            case Avacta.Optim.Client.Models.PlateSampleViewModel.PLATE:
                object srcWellAliquotsWithAdditives = this.Resources\["WellAliquotsWithAdditives"\];
                BindingListCollectionView blcv = (BindingListCollectionView)CollectionViewSource.GetDefaultView(srcWellAliquotsWithAdditives);
                blcv.CustomFilter = "additive <> null";
                break;
            default:
                break;
        }
    }

To date I have been unable to get the resource and therefore the view. (also I expect the filter 'code' is not suitable, any clues to the correct filter appreciated) Any ideas as to the 'correct' approach? Cheers AndyF.

Super Lloyd

Usually I use: FindResource() (instead of Resources[key]) Also I dunno if it's the right event but... if this is called before InitializeComponent() returns, your ResourceDictionary might be null. Hence it's a reasonable idea to test for / expect a null value. And then what is "this"? Is it the UI element where the collection is defined?

A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station.... _________________________________________________________ My programs never have bugs, they just develop random features.

zx12a1

Thanks for the thoughts. You are right, the event is fired too early even though it appears after the various code required to 'load' the data. The GUI (this) is a user control and its main property dependency ActiveWell is synchronized with a property on an associated control. The associated control sets the ActiveWell property on this control. This control listens to its change property events and 'loads' the entity graph, as described above, and then fies another event. The control listens to its own events and attemps to get the collectioin for filtering..... So far so bad.