How do you change WPF DataGrid cell background while editing the cell?

Question

The following is an example of how to set the background when the cell is selected, but when I actually click inside the cell to edit it the color changes. Is there a trigger property for when a cell is being edited? I'd like the background not to change.

<DataGrid Name="DG1" ItemsSource="{Binding}" SelectionUnit="Cell" >
    <DataGrid.CellStyle>
        <Style TargetType="DataGridCell" >
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background" Value="SeaGreen"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </DataGrid.CellStyle>
</DataGrid>

Answering my own question, it looks like the Cell background color is based off of SystemColors.WindowBrushKey. Overriding that resource like such <SolidColorBrush x:Key="{x:Static SystemColors.WindowBrushKey}" Color="Red" /> did the trick. `

Answer 1

You can add another trigger into your existing style for the IsEditing state. Then you can set the ControlTemplate for the DataGridCell inside of the trigger.

<Trigger Property="IsEditing" Value="True">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="DataGridCell">
                <TextBox Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Content.Text, Mode=TwoWay, UpdateSourceTrigger=Default}"
                         HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Padding="0" BorderThickness="0" Background="SeaGreen"/>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Trigger>