在 WPF 框架上设置 ScrollViewer（用于垂直滚动）的正确方法？
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Correct way to set ScrollViewer (for vertical scrolling) on a WPF Frame?
提问by JDL
does anyone know the difference between defining a vertical scrollbar on a frame like this:
有谁知道在这样的框架上定义垂直滚动条的区别：
<ScrollViewer Grid.Row="2" VerticalScrollBarVisibility="Auto">
<Frame Name="Frame1"
ScrollViewer.CanContentScroll="True" />
</ScrollViewer>
or like this:
或者像这样：
<ScrollViewer Grid.Row="2">
<Frame Name="Frame1"
ScrollViewer.VerticalScrollBarVisibility="Auto"
ScrollViewer.CanContentScroll="True" />
</ScrollViewer>
This frame is nested in a WebBrowser control and setting it the first way correctly displays the vertical scrollbar and is only visible when it needs to scroll (auto). When I set it the second way the vertical scrollbar works but is always visible even when it does not need to scroll (visible).
此框架嵌套在 WebBrowser 控件中，并将其设置为第一种方式正确显示垂直滚动条，并且仅在需要滚动（自动）时可见。当我以第二种方式设置它时，垂直滚动条工作但即使不需要滚动（可见）也始终可见。
I am going to use the 1st option because it meets my needs, but I don't want to be surprised down the road if I am setting it incorrectly.
我将使用第一个选项，因为它满足我的需求，但如果我的设置不正确，我不想在路上感到惊讶。
Thanks!
谢谢！
回答by Kapitán Mlíko
When you use ScrollViewer.VerticalScrollBarVisibilityor ScrollViewer.HorizontalScrollBarVisibilityattached property it has no effect with Frame.
当您使用ScrollViewer.VerticalScrollBarVisibility或ScrollViewer.HorizontalScrollBarVisibility附加属性时，它对 Frame 没有影响。
<ScrollViewer Margin="225.667,-4,0,296.939" HorizontalAlignment="Left" Width="221.667">
<Frame Content="Frame" ScrollViewer.CanContentScroll="True" ScrollViewer.HorizontalScrollBarVisibility="Visible" ScrollViewer.VerticalScrollBarVisibility="Hidden" Source="UserControl2.xaml" Background="#FFDE5454"/>
</ScrollViewer>
In example above I used both ScrollViewer.VerticalScrollBarVisibilityand ScrollViewer.HorizontalScrollBarVisibilityattached properties. outcome of that code is the exact opposite of what you would expect. There is no HorizontalScrollBarvisible... and you can still see VerticalScrollBar.
在上面的示例中，我同时使用了ScrollViewer.VerticalScrollBarVisibility和ScrollViewer.HorizontalScrollBarVisibility附加属性。该代码的结果与您期望的完全相反。没有HorizontalScrollBar可见的……你仍然可以看到VerticalScrollBar。
So that's why this is what you should use
所以这就是为什么这是你应该使用的
<ScrollViewer Grid.Row="2" VerticalScrollBarVisibility="Auto">
<Frame Name="Frame1" />
</ScrollViewer>
When you try this for example with ListBox then result will be different.
例如，当您使用 ListBox 尝试此操作时，结果会有所不同。
This is the result of following code:
这是以下代码的结果：
<ScrollViewer Margin="225.667,0,0,12.761" Height="280.178" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="221.667">
<ListBox ScrollViewer.CanContentScroll="True" ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Visible" Background="Orange" ItemsSource="{Binding Collection}" DisplayMemberPath="Property1" />
</ScrollViewer>
That's because those attached properties now affect ScrollViewer within ListBoxand not parent ScrollVieweras you may expect.
那是因为这些附加属性现在影响 ScrollViewer 内部ListBox而不是ScrollViewer您可能期望的父级。
So from this little experiment I assume that ScrollViewer.VerticalScrollBarVisibilityattached property is meant for cases where you want to be able to affect ScrollViewerwhich exists within Control's template and not parent ScrollViewer. So I think it does not work for example as DockPanel.Dockwhich takes effect on parent DockPanel.
因此，从这个小实验中，我假设ScrollViewer.VerticalScrollBarVisibility附加属性适用于您希望能够影响ScrollViewerControl 模板中存在的内容而不是 parent 的情况ScrollViewer。所以我认为它不起作用，例如DockPanel.Dock对 parent 生效DockPanel。
