在下面的WPF XAML中,ScrollViewer不起作用(它显示一个滚动条但你无法滚动,内容从窗口向下移动到底部)。

我可以将外部StackPanel更改为Grid,它可以正常工作。

但是,在我复制以下代码的应用程序中,我需要一个外部StackPanel。 我需要对StackPanel做什么才能让ScrollViewer显示一个可用的滚动条?,例如VerticalAlignment = QUOT;拉伸"高度= QUOT;自动"不工作。

 <StackPanel>
        <ScrollViewer>
            <StackPanel>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
                <TextBlock Text="This is a test"/>
            </StackPanel>
        </ScrollViewer>
 </StackPanel>
有帮助吗?

解决方案

你不能不修复 StackPanel 的高度。它旨在无限制地向一个方向发展。我建议使用不同的 Panel 。为什么你“需要”有一个外部 StackPanel

其他提示

这也困扰了我一段时间,诀窍是将你的stackpanel放在一个滚动查看器中。

此外,您需要确保将滚动查看器的CanContentScroll属性设置为True,这是一个示例:

  <ScrollViewer Grid.Row="1" Margin="299,12,34,54" Name="ScrollViewer1" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" Height="195" CanContentScroll="True">
        <StackPanel Name="StackPanel1" OverridesDefaultStyle="False"  Height="193" Width="376" VerticalAlignment="Top" HorizontalAlignment="Left"></StackPanel>
  </ScrollViewer>

请注意,有时您可能没有意识到StackPanel。在我的情况下,我有这个代码

<ScrollViewer>
  <ItemsControl ItemsSource="{Binding Pages}"/>
</ScrollViewer>

工作得很好。 “页面”绑定引用的是非常不同的,复杂的UserControls,我想在其中一些上只有滚动条。所以我删除了scrollviewer:

 <ItemsControl ItemsSource="{Binding Pages}"/>

然后我将ScrollViewer作为我想要的用户控件的顶级元素。但是,这不起作用。内容刚刚流出页面。起初我不认为这个问题/答案可以帮助我,但我意识到ItemsControl的默认ItemPanel是StackPanel。所以我通过指定一个不是StackPanel的ItemsPanel解决了我的问题:

<ItemsControl ItemsSource="{Binding Pages}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <Grid/>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
</ItemsControl>

事实上,我解决困境的方法是删除外部堆栈面板,而是将scrollviewer设置在主网格中我想要的位置。

        <Grid Style="{StaticResource LayoutRootStyle}">
    <Grid.RowDefinitions>
        <RowDefinition Height="160"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>        

    <!-- Vertical scrolling grid used in most view states -->    

        <ScrollViewer Grid.Row="1" HorizontalScrollBarVisibility="Auto">
            <StackPanel Orientation="Horizontal">
                <GridView>
                ...
                </GridView>
            </StackPanel>
        </ScrollViewer>        

这是它的工作原理:

<Window x:Class="TabControl.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        
    xmlns:local="clr-namespace:TabControl"
    Title="MainWindow"    Height="300"   
    DataContext="{Binding RelativeSource={RelativeSource Self}}"         
    >    
<StackPanel>
    <ScrollViewer Height="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Border}},Path=ActualHeight}" >
        <StackPanel >
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
            <TextBlock Text="This is a test"/>                <TextBlock Text="This is a test"/>
        </StackPanel>
    </ScrollViewer>
</StackPanel>

通过将ScrollViewer的高度绑定到窗口的内部高度。

重新调整大小的逻辑是我们需要给出任何元素修复高度或设计视图以使用渲染高度。

<强>输出:

移动Grid.Row =&quot; 1&quot;从StackPanel到ScrollViewer完全解决了它。

我在StackPanel中显示了大约40个项目的长列表,但只显示了前20个项目。

    <ScrollViewer Grid.Row="1" VerticalScrollBarVisibility="Auto">
        <StackPanel x:Name="ContentPanel" Margin="12,0,12,0">
        <TextBlock Text="{Binding Line1}" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        <TextBlock Text="" Margin="10,-2,10,0" Style="{StaticResource PhoneTextNormalStyle}" />
        ...
        </StackPanel>
    </ScrollViewer>

如果您的堆栈面板位于网格中,我会这样做:

<ScrollViewer Grid.Row="1" VerticalScrollBarVisibility="Auto">
    <StackPanel MaxHeight="{Binding Path=Height,RelativeSource={RelativeSource 
              AncestorType=Grid}}">
    </StackPanel>
</ScrollViewer>
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