ItemsControl的UWP绑定方向

我想创建一个模板控件，它派生自

ItemsControl

，如果需要，可以更改它的方向

所以，我试过这个：

<Setter Property="ItemsPanel">
    <Setter.Value>
        <ItemsPanelTemplate>
            <ItemsStackPanel Orientation="{Binding Orientation, RelativeSource={RelativeSource Mode=TemplatedParent}}"/>
        </ItemsPanelTemplate>
    </Setter.Value>
</Setter>

它不起作用，然后我尝试了

Mode=Self

，没有成功

Orientation

是一个

dependencProperty

，我已经在.cs文件中声明了它

我遇到了一个wpf的旧解决方案，它使用了UWP中不可用的

AncestorType

我怎样才能解决这个问题

---

谢谢

这在UWP中是不支持的。见：

Windows演示基础（WPF）和微软Silverlight支持使用绑定表达式为样式中的SETER提供值的能力。Windows运行时不支持Setter.Value的绑定用法（绑定将不会计算，Setter无效，不会出现错误，但也不会得到所需的结果）。当您从Windows演示基础（WPF）或微软Silverlight XAML转换XAML样式时，用绑定字符串或设置值的对象替换任何绑定表达式用法，或将这些值重构为共享{STATEATIORATURSOR}标记扩展值而不是绑定值。 但您可以使用attache属性来执行此操作

在主页面中添加方向属性

    public static readonly DependencyProperty OrientationProperty = DependencyProperty.Register(
        "Orientation", typeof(Orientation), typeof(MainPage), new PropertyMetadata(default(Orientation)));

    public Orientation Orientation
    {
        get { return (Orientation) GetValue(OrientationProperty); }
        set { SetValue(OrientationProperty, value); }
    }

添加BindingHelper并定义attache属性

    public static readonly DependencyProperty ItemsPanelOrientationProperty = DependencyProperty.RegisterAttached(
        "ItemsPanelOrientation", typeof(bool), typeof(BindingHelper),
        new PropertyMetadata(default(bool), ItemsPanelOrientation_OnPropertyChanged));

在属性更改的

ItemsPanelOrientation\u中

设置绑定到ItemsStackPanel.Orientation

    private static async void ItemsPanelOrientation_OnPropertyChanged(DependencyObject d,
        DependencyPropertyChangedEventArgs e)
    {
        if (d is ListView listView)
        {
            await listView.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                if (listView.ItemsPanelRoot is ItemsStackPanel stackPanel)
                {
                    BindingOperations.SetBinding(stackPanel, ItemsStackPanel.OrientationProperty, new Binding()
                    {
                        Path = new PropertyPath("Orientation"),
                        Mode = BindingMode.OneWay
                    });
                }
            });
        }
    }

    public MainPage()
    {
        this.InitializeComponent();

        Task.Run(async () =>
        {
            while (true)
            {
                await Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                    () => { Orientation = Orientation.Horizontal; });

                await Task.Delay(TimeSpan.FromSeconds(5));

                await Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                    () => { Orientation = Orientation.Vertical; });

                await Task.Delay(TimeSpan.FromSeconds(5));
            }
        });
    }

在xaml中，编写BindingHelper.ItemsPaneLocation和ItemsPaneTemplate

        <ListView.Style>
            <Style TargetType="ListView">
                <Setter Property="ItemsPanel">
                    <Setter.Value>
                        <ItemsPanelTemplate>
                            <ItemsStackPanel Orientation="{Binding Orientation, RelativeSource={RelativeSource Mode=TemplatedParent}}"/>
                        </ItemsPanelTemplate>
                    </Setter.Value>
                </Setter>
                <Setter Property="local:BindingHelper.ItemsPanelOrientation" Value="True"></Setter>
            </Style>
        </ListView.Style>

在主页中编写代码以更改方向

    private static async void ItemsPanelOrientation_OnPropertyChanged(DependencyObject d,
        DependencyPropertyChangedEventArgs e)
    {
        if (d is ListView listView)
        {
            await listView.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                if (listView.ItemsPanelRoot is ItemsStackPanel stackPanel)
                {
                    BindingOperations.SetBinding(stackPanel, ItemsStackPanel.OrientationProperty, new Binding()
                    {
                        Path = new PropertyPath("Orientation"),
                        Mode = BindingMode.OneWay
                    });
                }
            });
        }
    }

    public MainPage()
    {
        this.InitializeComponent();

        Task.Run(async () =>
        {
            while (true)
            {
                await Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                    () => { Orientation = Orientation.Horizontal; });

                await Task.Delay(TimeSpan.FromSeconds(5));

                await Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                    () => { Orientation = Orientation.Vertical; });

                await Task.Delay(TimeSpan.FromSeconds(5));
            }
        });
    }

github中的所有代码：