<DataTemplate.Triggers>
<DataTrigger Binding="{Binding Path=IsSelected, RelativeSource={RelativeSource AncestorType=DataGridRow}}" Value="True">
<Setter TargetName="TextBoxStackPanel" Property="Background" Value="White"/>
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsSelected, RelativeSource={RelativeSource AncestorType=DataGridCell}}" Value="True">
<Setter TargetName="TextBoxStackPanel" Property="Background" Value="White"/>
</DataTrigger>
</DataTemplate.Triggers>
以上分别为行选中和单元格选中时触发
TextBoxStackPanel为 DataTemplate 下的子元素StackPanel的Name标签：DataGrid,参考,cell,背景色,选中,wpf From： https://www.cnblogs.com/wuguoqiang/p/16985323.html