ListBox垂直滾動條不顯示（WPF）

Question

我有一個視圖，該視圖應顯示信息並進行測試，我添加了testdata。 但是，如果我為屏幕空間添加了太多項目，則不會出現垂直滾動條。

這是我的XML代碼：

<UserControl x:Class="not relevant"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="not relevant"
    mc:Ignorable="d"
     Width="250">

<Border Background="{DynamicResource  BG}" BorderBrush="{DynamicResource  BorderBrush}" BorderThickness="1">
    <StackPanel>
        <Grid>
            <Label  Height="30" Content="Geöffnete Designs" HorizontalContentAlignment="Center"></Label>
            <Separator Background="DarkGray"/>
            <ListBox  Background="{DynamicResource BG}" BorderThickness="0" VerticalAlignment="Stretch" >
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
                <ListBoxItem>
                    <Label Content="Hallo"></Label>
                </ListBoxItem>
            </ListBox>
        </Grid>
    </StackPanel>
</Border>

我嘗試添加滾動查看器，但無法正常工作。 我是在做錯事還是我可能出什么問題？

Answer 1

只需在您的xaml代碼中刪除StackPanel 。 您不需要它，只會遇到問題。 我建議您更改樣式布局，因為您不應該使用Grid 。

當您想在頂部顯示Label並在Label下顯示List時，至少添加一些RowDefinitions來布局UI。

看起來像這樣

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Label Grid.Row="0"
           Height="30"
           Content="Geöffnete Designs"
           HorizontalContentAlignment="Center" />
    <Separator Grid.Row="1"
               Background="DarkGray" />
    <ListBox Grid.Row="2"
             BorderThickness="0"
             VerticalAlignment="Stretch">

Answer 2

只需在您的XAML中添加滾動查看器

    <ScrollViewer>
    <Border BorderThickness="1">
        <StackPanel>
            <Grid>
                <Label  Height="30" Content="Geöffnete Designs" HorizontalContentAlignment="Center"></Label>
                <Separator Background="DarkGray"/>
                <ListBox BorderThickness="0" VerticalAlignment="Stretch" >
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                    <ListBoxItem>
                        <Label Content="Hallo"></Label>
                    </ListBoxItem>
                </ListBox>
            </Grid>
        </StackPanel>
    </Border>
</ScrollViewer>