将 AdaptiveTrigger.MinWindowWidth 设置为 TemplateBinding 会导致触发器永远不会执行

Question

目前我在 generic.xaml

中的一个自定义控件中有此代码

<VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="VisualStateGroup">
                            <VisualState x:Name="VisualStateNarrow">
                                <VisualState.StateTriggers>
                                    <AdaptiveTrigger x:Name="VisualStateNarrowTrigger" MinWindowWidth="{TemplateBinding VisualStateNarrowMinWidth}" />
                                </VisualState.StateTriggers>
                                <VisualState.Setters>
                                    <Setter Target="PART_SPACER.Visibility" Value="Visible" />
                                </VisualState.Setters>
                            </VisualState>
                            <VisualState x:Name="VisualStateNormal">
                                <VisualState.StateTriggers>
                                    <AdaptiveTrigger x:Name="VisualStateNormalTrigger" MinWindowWidth="{TemplateBinding VisualStateNormalMinWidth}"/>
                                </VisualState.StateTriggers>
                                <VisualState.Setters/>
                            </VisualState>
                        </VisualStateGroup>
</VisualStateManager.VisualStateGroups>

其中VisualStateNarrowMinWidth和VisualStateNormalMinWidth为int类型的DependencyProperties，例如：

public int VisualStateNarrowMinWidth
        {
            get { return (int)GetValue(VisualStateNarrowMinWidthProperty); }
            set { SetValue(VisualStateNarrowMinWidthProperty, value); }
        }

        public static readonly DependencyProperty VisualStateNarrowMinWidthProperty =
            DependencyProperty.Register(nameof(VisualStateNarrowMinWidth), typeof(int), typeof(PageHeader), new PropertyMetadata(default(int)));

将 MinWindowWidth 设置为一个整数，如 0 表示窄，521 表示正常，使其执行得很好。我将如何使用它进行绑定？

Answer 1

绑定到 TemplatedParent，像这样：

<AdaptiveTrigger x:Name="VisualStateNarrowTrigger" MinWindowWidth="{Binding VisualStateNarrowMinWidth, RelativeSource={RelativeSource TemplatedParent}}" />