wpf datagrid 隔行变色

<DataGrid AlternationCount="2">
   <DataGrid.RowStyle>
        <Style TargetType="{x:Type DataGridRow}">
            <Style.Triggers>
                <Trigger Property="ItemsControl.AlternationIndex"
                         Value="0">
                    <Setter Property="Background" Value="Red" />
                </Trigger>
                <Trigger Property="ItemsControl.AlternationIndex"
                         Value="1">
                    <Setter Property="Background" Value="Write" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </DataGrid.RowStyle>
</DataGrid>