WPF TextBlock根据搜索条件突出显示某些部分

<DataGrid x:Name="dataGrid">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Search Term" Binding="{Binding SearchTerm}" />
        <DataGridTextColumn Header="Result" Binding="{Binding Result}" />
    </DataGrid.Columns>
    <DataGrid.Triggers>
        <DataTrigger Binding="{Binding SearchTerm}" Value="{x:Null}">
            <Setter TargetName="dataGrid" Property="Background" Value="LightGray" />
        </DataTrigger>
        <DataTrigger Binding="{Binding SearchTerm}" Value="{Binding Result}">
            <Setter TargetName="dataGrid" Property="Background" Value="AliceBlue" />
        </DataTrigger>
    </DataGrid.Triggers>
</DataGrid>