Trying to use converter on DistinctValues

[Eli]

Hello,

I styled the FilteringControl on a RadGrid to include a converter on the list of distinct values to filter by.

I am using this code in the converter,

            var filter = value as FilteringViewModel;
            if (filter != null)
            {
                foreach (DistinctValueViewModel distinctValue in filter.DistinctValues)
                {
                    
                }
                return filter.DistinctValues;
            }

            return null;

But when I put a breakpoint on the code it says that DistinctValues.Count = 0 and the loop will not trigger.

However, after the converter returns it's value, it shows the distinct values correctly.

I am wondering why I cannot access the distinct list inside the converter because I know it returns the right value.

Thank you,

[Eli]

Also, I am trying to access the column the filters belong to using var column = filter.GetType().GetField("column"); and it is returning null. How can I get access to the column from within the filter?

[Vlad]

Hi,

 I'm not sure how this is related to RadDataFilter. Can you clarify? 

Regards,
Vlad
the Telerik team

[Eli]

Doesn't the FilteringControl from the grid inherited from the RadDataFilter?

[Vlad]

Hello,

 Actually no. Both are completely different and independent. 

Greetings,
Vlad
the Telerik team

[Eli]

Okay, how do I solve the problem?

[Eli]

Is this still an open question?

[Eli]

Hello? anyone here?

[Rossen Hristov]

Hi,

Distinct values are loaded and shaped on demand. We are using our own conversion logic in order to shape how the distinct values look in the UI. Here is how we do it:

<ListBox x:Name="PART_DistinctValuesList"
     ItemsSource="{Binding DistinctValues}"
     telerik:StyleManager.Theme="{StaticResource Theme}"
     ScrollViewer.HorizontalScrollBarVisibility="Auto"
     SelectionMode="Multiple" ItemContainerStyle="{StaticResource DistinctValueListBoxItemStyle}">
    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel  MaxHeight="242"/>
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <CheckBox IsChecked="{Binding IsActive, Mode=TwoWay}"
                  Content="{Binding ConvertedValue, Converter={StaticResource DistinctValueConverter}}"
                  VerticalContentAlignment="Center"
                  telerik:StyleManager.Theme="{StaticResource Theme}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

So if you want to replace our stock converter with your one you can do it directly in the XAML. Alongside with the ConvertedValue property, the DistinctValueViewModel has another property called RawValue. So you can do something like this in XAML and the raw distinct value will be entering your converter:

<CheckBox IsChecked="{Binding IsActive, Mode=TwoWay}"

                  Content="{Binding RawValue, Converter={StaticResource YourConverter}}"

                  VerticalContentAlignment="Center"

                  telerik:StyleManager.Theme="{StaticResource Theme}"/>

The result of what your converter returns will be displayed in the UI as the content of the check-box.

I hope this helps. Also, placing a question in the correct product forum is always a good idea. RadDataFilter is an independent control that has absolutely nothing to do with RadGridView.

Regards,
Rossen Hristov
the Telerik team