Question

I have UserControl bounded to my view model. View model implements IDataErrorInfo. UserConrol has Validation.ErrorTemplate. In this template I use converter to show tooltip with errors:

<UserControl.Style>
    <Style TargetType="{x:Type UserControl}">
        <Setter Property="Validation.ErrorTemplate">
            <Setter.Value>
                <ControlTemplate>
                    <DockPanel>
                        <AdornedElementPlaceholder x:Name="adorner">
                            <Image x:Name="imgError"
                                       Width="32"
                                       Height="32"
                                       Margin="5"
                                       HorizontalAlignment="Left"
                                       VerticalAlignment="Bottom"
                                       ToolTip="{Binding ElementName=adorner,Path=AdornedElement.(Validation.Errors),Converter={StaticResource ValidationErrors2TooltipConverter},ConverterParameter='Couldn't save hour work:'}"
                                       Source="{StaticResource ErrorDrawingImage}" />
                        </AdornedElementPlaceholder>
                    </DockPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</UserControl.Style>

When I change some property (for instance: ComboBox‘s selection), the number of error should change, but it doesn’t. I couldn’t find a way to refresh errors in ToolTip.

Questions:

1. How could I refresh errors in ToolTip.
2. Validation works fine for UserControl, but doesn’t work for components inside it. I defined Validation.ErrorTemplate‘s for components in UserControl, but they are not visible, however controls bounded to view models (with IDataErrorInfo).

Answer 1

The validation pattern must be applied for each control inside your UserControl. There’s no “inheritance”.