示例代碼：

<DataGrid
    Padding="0"
    ItemsSource="{Binding Items}"
    SelectedItem="{Binding SelectedItem}"
    SelectionMode="Single"
    Style="{StaticResource DataGridStyle1}">
    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Exists}" Value="False">
                    <Setter Property="Background" Value="LightGray" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.RowStyle>