WPF，这个对齐方式为什么不听使唤
<Grid HorizontalAlignment="Left" Height="557" VerticalAlignment="Top" Width="483">
<Border Grid.ColumnSpan="2" BorderThickness="0,0,0,2" BorderBrush="SteelBlue">
<TextBlock Text="张三" TextAlignment="Center" HorizontalAlignment="Stretch" />
</Border>
</Grid>



设置了TextBlock填满Border，设置了TextBlock的文本居中，可是结果为什么没有居中呢？
[解决办法]
你不是已居中了么？你要的是垂直居中？
[解决办法]
VerticalAlignment要选成Center

    <Grid>
        <Border Grid.ColumnSpan="1" BorderThickness="1" BorderBrush="SteelBlue">
            <TextBlock Text="张三" TextAlignment="Center" VerticalAlignment="Center" />
        </Border>
    </Grid>