Custom filter for custom GridViewColumn

[Boukerroui]

I have ceate a custom filter (inherit from IFilteringControl) with 2 chekbox (values : All and Present) and want to apply it for a custom GridViewColumn

<telerikGridView:GridViewColumn UniqueName="Commandes_MultiSources"
        HeaderCellStyle="{StaticResource HeaderCellSmallStyle}"
        IsVisible="False"
        IsSortable="False"
        IsReadOnly="True">
    <telerikGridView:GridViewColumn.CellTemplate>
        <DataTemplate>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition />
                </Grid.ColumnDefinitions>
                <TextBlock Grid.Column="0" x:Name="Present"
                           TextDecorations="Underline"
                           Cursor="Hand" HorizontalAlignment="Center"
                           Text="{Binding MultiSourcesPresent}"
                           MouseLeftButtonUp="MultiSources_MouseLeftButtonUp"/>
                <TextBlock Grid.Column="1" x:Name="Tous"
                           TextDecorations="Underline"
                           Cursor="Hand" HorizontalAlignment="Center"
                           Text="{Binding MultiSourcesTous}"
                           MouseLeftButtonUp="MultiSources_MouseLeftButtonUp"/>
            </Grid>
        </DataTemplate>
    </telerikGridView:GridViewColumn.CellTemplate>
    <telerikGridView:GridViewColumn.Header>
        <Grid Width="Auto" HorizontalAlignment="Stretch">
            <Grid.RowDefinitions>
                <RowDefinition Height="50*"/>
                <RowDefinition Height="50*"/>
            </Grid.RowDefinitions>
            <TextBlock Grid.Row="0" Padding="0 0 0 2" TextAlignment="Center" Text="multi_source"/>
            <Grid Grid.Row="1">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="50*" />
                    <ColumnDefinition Width="50*"/>
                </Grid.ColumnDefinitions>
                <TextBlock Grid.Column="0" Padding="0 2 20 0" TextAlignment="Center" Text="Present" />
                <TextBlock Grid.Column="1" Padding="5 2 0 0" TextAlignment="Center" Text="All" />
            </Grid>
        </Grid>
    </telerikGridView:GridViewColumn.Header>
    <telerikGridView:GridViewColumn.FilteringControl>
        <UCPlanipe:FilterControlMultiSource/>
    </telerikGridView:GridViewColumn.FilteringControl>
</telerikGridView:GridViewColumn>

in custom filter i cant not use GridViewBoundColumnBase  and i have error (NullReferenceException) in OnFilter method (line 8)

01.private void OnFilter(object sender, RoutedEventArgs e)
02.        {
03.            CreateFilters();
04.            try
05.            {
06.                if (!this.column.DataControl.FilterDescriptors.Contains(this.compositeFilter))
07.                {
08.                    this.column.DataControl.FilterDescriptors.Add(this.compositeFilter);
09.                }
10.                this.IsActive = true;
11.                OnFiltredComplet();
12.            }
13.            catch (Exception ex)
14.            {
15.                // error message is : Object reference not set to an instance of an object
16.            }
17.        }

[Dimitrina]

Hi,

May I ask you to check why this exception is thrown, is this.column null? How do you initialize this.column? Why do you use GridViewColumn and not GridViewBoundColumnBase? How do you intend to perform the filtering in that case? Please note filtering is a data operation which means it is done by building and executing a LINQ query appending proper Where clause over the source collection. 

Generally, you can refer to our online documentation on how to create a custom filtering control. For more practical project on this you can also check our CustomFilterControls online demo and  the "Custom FilterControl" SDK example running the SDK Samples Browser. 

Regards,
Dimitrina
Telerik

 

 

[Boukerroui]

Hi,
tank you for response. My Linq expression  is not find.