WPF 修改DataGrid选中行时的颜色

<Style TargetType="{x:Type DataGridCell}">
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background" Value="Black" />
                </Trigger>
                <Trigger Property="IsFocused" Value="true">
                    <Setter Property="Background" Value="Red" />
                </Trigger>
            </Style.Triggers>
        </Style>