Question

Searched a lot about this problem but never found a answer, that solved it.

I´ve got the following CheckboxColumn in a WPF datagrid:

<DataGridCheckBoxColumn Header="Erledigt" Binding="{Binding Path=erledigt}"  />

The variable erledigt contains 0 or 1. Now I want, that if the Checkbox is checked, the cellbackground is green.
Hopelessly searched for a checked property. How can I manage this?

Answer 1

You could add a CellStyle to the column in which you just use a DataTrigger on erledigt, you don’t need the IsChecked property itself. Using the ElementStyle and EditingElementStyle you should be able to add a normal Trigger on IsChecked as the style should be one applied the CheckBoxes, however the scope would also be limited to the CheckBoxes themselves and not the cell.

---

<DataGridCheckBoxColumn.CellStyle>
    <Style TargetType="DataGridCell">
        <Style.Triggers>
            <DataTrigger Binding="{Binding erledigt}" Value="1">
                <Setter Property="Background" Value="LightGreen"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>
</DataGridCheckBoxColumn.CellStyle>

You can also bind to the CheckBox.IsChecked from the cell level, this has the effect that the colour will be changing right away instead of after committing the change which then affects the bound property. To do so change the trigger in the CellStyle to this:

<DataTrigger Binding="{Binding Content.IsChecked,
                               RelativeSource={RelativeSource Self}}"
             Value="True">