<DataGridTextColumn Header="年龄" Binding="{Binding Path=Age}" >
    <DataGridTextColumn.ElementStyle>
        <Style TargetType="TextBlock">
            <Setter Property="Background" Value="YellowGreen" />
        </Style>
    </DataGridTextColumn.ElementStyle>
</DataGridTextColumn>
列的背景色,为什么和网格线之间有空隙呢?不好看哦。TextBlock又没有边框的,怎么填满整个空隙呢?