downkyicore/DownKyi/Views/ViewDownloadManager.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="DownKyi.Views.ViewDownloadManager"
             xmlns:prism="http://prismlibrary.com/"
             xmlns:vm="clr-namespace:DownKyi.ViewModels"
             xmlns:i="using:Avalonia.Xaml.Interactivity"
             xmlns:ia="clr-namespace:Avalonia.Xaml.Interactions.Core;assembly=Avalonia.Xaml.Interactions"
             x:DataType="vm:ViewDownloadManagerViewModel"
             prism:ViewModelLocator.AutoWireViewModel="True">
    <Grid RowDefinitions="50,1,*">

        <Grid Grid.Row="0" ColumnDefinitions="200,*,100">

            <Button
                Grid.Column="0"
                Margin="10,5,0,5"
                HorizontalAlignment="Left"
                VerticalAlignment="Center"
                Command="{Binding BackSpaceCommand}"
                Theme="{StaticResource ImageBtnStyle}">
                <StackPanel Orientation="Horizontal">
                    <ContentControl Width="24" Height="24">
                        <Path
                            Theme="{StaticResource NavigationIcon.ArrowBack}"
                            Width="24"
                            Height="24"
                            Fill="{DynamicResource ColorTextDark}" />
                    </ContentControl>
                    <TextBlock
                        VerticalAlignment="Center"
                        FontSize="16"
                        Foreground="{DynamicResource BrushTextDark}"
                        Text="{DynamicResource DownloadManager}" />
                </StackPanel>
            </Button>
        </Grid>
        <TextBlock Grid.Row="1" Background="{DynamicResource BrushBorder}" />
        <Grid Grid.Row="2" ColumnDefinitions="200,*">

            <ListBox
                Name="NameLeftTabHeaders"
                Grid.Column="0"
                BorderThickness="0"
                ItemsSource="{Binding TabHeaders}"
                SelectedIndex="{Binding SelectTabId}"
                ItemContainerTheme="{StaticResource LeftTabHeaderItemStyle}"
                Theme="{StaticResource LeftTabHeaderStyle}">
                <i:Interaction.Behaviors>
                    <ia:EventTriggerBehavior EventName="SelectionChanged">
                        <ia:InvokeCommandAction Command="{Binding LeftTabHeadersCommand}"
                                                CommandParameter="{Binding ElementName=NameLeftTabHeaders, Path=SelectedItem}" />
                    </ia:EventTriggerBehavior>
                </i:Interaction.Behaviors>
            </ListBox>
            <!--  右侧内容区  -->
            <ContentControl Grid.Column="1" prism:RegionManager.RegionName="DownloadManagerContentRegion" />
        </Grid>
    </Grid>
</UserControl>