WPF Datagrid trigger row colour based on value

Question

I have a WPF application that contains a datagrid. The datagrid is bound to my object OrderBlock which contains a List of type Orders.

Answer 1

Do you need to change the behaviour of the DataGridRow, or is it sufficient to alter the style?

If changing the row highlighting based on a property is all you need, you should be able to just use a simpler Style, something like this:

    <!-- A brush -->
    <LinearGradientBrush x:Key="BgBrush1" StartPoint="0,0" EndPoint="0,1">
        <GradientStop Offset="0" Color="#888888"/>
        <GradientStop Offset="1" Color="#FFFFF86E"/>
    </LinearGradientBrush>

    <!-- Your row style -->
    <Style x:Key="HighlightRow" TargetType="{x:Type DataGridRow}">
        <Style.Triggers>
            <DataTrigger Binding="{Binding StatusGood}" Value="Hold">
                <Setter Property="Background" Value="{StaticResource BgBrush1}" />
            </DataTrigger>
        </Style.Triggers>
    </Style>

You should be able to apply the style when required in a DataGrid by using your style as a StaticResource for the RowStyle property:

<DataGrid DataContext="{Binding OrderBlock}"
          Name="dataGridOrdersGood" 
          ItemsSource="{Binding Orders}" 
          RowStyle="{StaticResource HighlightRow}" />

Edit:

If you want to retain the rest of your styling and use a control template, you can place your DataTrigger in your ControlTemplate.Triggers, you'll also have to supply a TargetName property, to specify the element you wish the trigger to act on, so using my above brush, and your initial code:

<!-- Data grid formatting Grid Row template -->
<Style x:Key="DG_Row" TargetType="{x:Type DataGridRow}">        
    <Setter Property="Template">            
        <Setter.Value>
        <!-- Your code -->
            <ControlTemplate TargetType="{x:Type DataGridRow}">
                <Border x:Name="DGR_Border"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        SnapsToDevicePixels="True">
                <!-- Your code -->
                </Border>
                <ControlTemplate.Triggers>
                    <DataTrigger Binding="{Binding StatusGood}" Value="Send">
                        <Setter TargetName="DGR_Border" Property="Background" Value="{StaticResource BgBrush1}"/>
                     </DataTrigger>
                 </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Where DGR_Border is the name you had given your border with the existing gradient.