为什么WPF的TextBlock的滚动条不成功？下面这代码有什么问题吗？

Question

<Window x:Class="test.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" FontSize="50">
    <Grid>
        <TextBlock TextWrapping="Wrap"
                   ScrollViewer.VerticalScrollBarVisibility="Auto">
        abcdefghijklmnopaaaa aaabbbbbbb ccccccccc cdddddddeeeeeeeeefffffffffggggggggghhhh
        </TextBlock>
    </Grid>
</Window>

Answer 1

TextBlock没有设置宽高，TextBlock的大小会根据字数的变化自动变化，运行环境是出滚动条呢，还是自动扩大TextBlock呢？我估计运行环境自己是主动选择自动扩大TextBlock而不是出现滚动条。我忘了WPF的带滚动条的Textblock是不是这么写也好用了。反正Silverlight（WPF的子集）是像下面这么写，你可以试试<ScrollViewer Name="scrollViewer" Width ="200" Height="20" VerticalScrollBarVisibility="Auto">
    <ScrollViewer.Content>
        <TextBlock TextWrapping="Wrap">
        abcdefghijklmnopaaaa aaabbbbbbb ccccccccc cdddddddeeeeeeeeefffffffffggggggggghhhh
        </TextBlock>
    /ScrollViewer.Context>
</ScrollViewer>