How to merge single binding validationrule errors to bindinggroup?

Question

Example:

<Grid>
    <Grid.BindingGroup>
        <BindingGroup x:Name="Group"/>
    </Grid.BindingGroup>
    <TextBox>
        <TextBox.Text>
            <Binding Path="Name" BindingGroupName="Group">
                <Binding.ValidationRules>
                    <rules:MyCustomCommonRule/>
                </Binding.ValidationRules>
            </Binding>
        </TextBox.Text>
    </TextBox>
    <TextBox Text="{Binding Name2}"/>
    <Button Content="Commit"
              IsEnabled="{Binding ElementName=Group,
              Path=HasValidationError,
              Converter={StaticResource NotConverter}}"/>
</Grid>

If MyCustomCommonRule has return validation error, how to make the button disabled?

Answer 1

Hi,

Welcome to our Microsoft Q&A platform!

Grid doesn't have HasValidationError property.

If you want to use code behind ,see my code:

if (Validation.GetHasError(GridName) == true)
{
ButtonName.IsEnabled = false;
}

or you can use xaml:

<Button   >
            <Button.Style>
                <Style TargetType="Button">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding ElementName=Grid1,Path=(Validation.HasError),UpdateSourceTrigger=PropertyChanged}" Value="True">
                            <Setter Property="IsEnabled" Value="False"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>

Thanks.