c# - CustomMessageBox 中的列表框总是向上滚动

Question

我有一个列表框的奇怪问题，它被放置在一个自定义消息框中。

问题:您无法向下滚动列表，因为“拖动手势”向上与向下的效果相同。所以我唯一得到的就是当您位于列表顶部时的响应动画。

我做了一个小样本:

<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>


    <!--TitlePanel contains the name of the application and page title-->
    <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
        <TextBlock Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}" Margin="12,0"/>
        <TextBlock Text="page name" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
    </StackPanel>

    <!--ContentPanel - place additional content here-->
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">

        <Button Background="Bisque" Content="Click Me" Click="Button_Click"></Button>

    </Grid>
</Grid>

public partial class MainPage : PhoneApplicationPage
{
    // Constructor
    public MainPage()
    {
        InitializeComponent();
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        var source = new string[200];

        for (int i = 0; i < source.Length; i++)
        {
            source[i] = i.ToString();
        }

        var dialog = new CustomMessageBox()
        {
            Content = new ListBox(){ItemsSource = source},
            RightButtonContent = "Cancel",
            LeftButtonContent = "Store",
            VerticalContentAlignment = VerticalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Center,
            Background = new SolidColorBrush(Colors.Black),
            HorizontalContentAlignment = HorizontalAlignment.Center,
            HorizontalAlignment = HorizontalAlignment.Center
        };

        dialog.Show();
    }
}

如果你想下载它，这里是链接: https://onedrive.live.com/redir?resid=6B27FD720F1FB58D!15988&authkey=!ACG5krcfzsoBxA8&ithint=folder%2csln

有谁知道出了什么问题吗？ 感谢您的帮助。

Answer 1

有一个简单的修复方法。将 Height 添加到 ListBox。像这样。

var dialog = new CustomMessageBox()
{
    Content = new ListBox(){ItemsSource = source, Height = 800},
    RightButtonContent = "Cancel",
    LeftButtonContent = "Store",
    VerticalContentAlignment = VerticalAlignment.Top, // Change to Top
    VerticalAlignment = VerticalAlignment.Top, // Change to Top
    Background = new SolidColorBrush(Colors.Black),
    HorizontalContentAlignment = HorizontalAlignment.Center,
    HorizontalAlignment = HorizontalAlignment.Center
};

将 VerticalContentAlignment 和 VerticalAlignment 更改为顶部，这样当您将高度值设置为小于 800 时，内容将对齐到顶部。