2.WPF-StackPanel--Orientation(元素堆叠方式)--HorizontalAlignment(水平对齐方式)--VerticalAlignment(垂直对齐方式)

<Window x:Class="StackPanel和border.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel Orientation="Vertical">
        <Button Content="button1" ></Button>
        <Button Content="button1" HorizontalAlignment="Stretch"></Button>
        <Button Content="button1" ></Button>
        <Button Content="button1" ></Button>
        <Button Content="button1" HorizontalAlignment="Center"  VerticalAlignment="Bottom"></Button>
    </StackPanel>
</Window>