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:

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

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:

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