将 Setter 的值设置为附加属性

Question

我需要能够将 setter 的 Value 设置为附加属性，但在提出语法时遇到了困难。这是我的触发器的样子：

<DataTrigger Binding="{Binding Path=IsDisabled}" Value="True">
    <Setter TargetName="LayoutRoot" Property="Opacity" Value="0.3" />
    <Setter TargetName="LayoutRoot" Property="Background" Value="Interaction:Behaviors.OriginalBgBrush" />
</DataTrigger>

其中 Interaction:Behaviors.OriginalBgBrush 是在 LayoutRoot 上设置的附加属性，而 LayoutRoot 是一个边框。我必须这样做，因为在此之上的标准触发器设置了背景，但我无法同时检查模板和数据触发器的值。下面是整个模板，其中 MultiTrigger 是设置我不想要的背景的模板。背景颜色也以单​​独的样式定义，该样式使用此 ControlTemplate 作为其模板属性。

<ControlTemplate x:Key="StandardRowStyle" TargetType="tk:DataGridRow">
    <Border x:Name="LayoutRoot" Margin="0,0,0,-1" MinHeight="23" Interaction:Behaviors.OriginalBgBrush="{TemplateBinding Background}" PreviewMouseRightButtonDown="DataGridRow_SimpleMouseDown" PreviewMouseLeftButtonDown="DataGridRow_SimpleMouseDown" Background="{TemplateBinding Background}" BorderBrush="{StaticResource ElementBorderBrush}" BorderThickness="1" CornerRadius="0" SnapsToDevicePixels="True">
        <toolkit:SelectiveScrollingGrid x:Name="DGR_SelectiveScrollingGrid">
            <toolkit:SelectiveScrollingGrid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="*"/>
            </toolkit:SelectiveScrollingGrid.ColumnDefinitions>

            <toolkit:SelectiveScrollingGrid.RowDefinitions>
                <RowDefinition Height="*" MinHeight="23"/>
                <RowDefinition Height="Auto"/>
            </toolkit:SelectiveScrollingGrid.RowDefinitions>

            <toolkit:DataGridCellsPresenter Grid.Column="1" Grid.Row="0" x:Name="DGR_CellsPresenter" ItemsPanel="{TemplateBinding ItemsPanel}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
            <toolkit:DataGridDetailsPresenter Grid.Column="1" Grid.Row="1" Visibility="{TemplateBinding DetailsVisibility}" toolkit:SelectiveScrollingGrid.SelectiveScrollingOrientation="{Binding Path=AreRowDetailsFrozen, Converter={x:Static tk:DataGrid.RowDetailsScrollingConverter}, ConverterParameter={x:Static tk:SelectiveScrollingOrientation.Vertical}, RelativeSource={RelativeSource AncestorType={x:Type tk:DataGrid}}}" />
            <!--<toolkit:DataGridRowHeader Grid.Column="2" Grid.RowSpan="2" toolkit:SelectiveScrollingGrid.SelectiveScrollingOrientation="Vertical" Visibility="{Binding Path=HeadersVisibility, Converter={x:Static tk:DataGrid.HeadersVisibilityConverter}, ConverterParameter={x:Static tk:DataGridHeadersVisibility.Row}, RelativeSource={RelativeSource AncestorType={x:Type tk:DataGrid}}}"/>-->
        </toolkit:SelectiveScrollingGrid>
    </Border>
    <ControlTemplate.Triggers>
        <MultiTrigger>
            <MultiTrigger.Conditions>
                <Condition Property="IsMouseOver" Value="True" />
                <Condition Property="IsSelected" Value="False" />
                <Condition Property="DetailsVisibility" Value="Collapsed" />     
            </MultiTrigger.Conditions>
            <Setter TargetName="LayoutRoot" Property="Background" Value="{StaticResource InactiveSelectedBackgroundBrush}" />
            <Setter TargetName="LayoutRoot" Property="BorderBrush" Value="{StaticResource InactiveOuterBorderBrush}" />
            <Setter TargetName="LayoutRoot" Property="CornerRadius" Value="5" />
        </MultiTrigger>            
        <DataTrigger Binding="{Binding Path=IsDisabled}" Value="True">
            <Setter TargetName="LayoutRoot" Property="Opacity" Value="0.3" />
            <!-- Background needs to be changed back to default here -->
        </DataTrigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

Answer 1

只需使用 ElementName 绑定：

<Setter TargetName="LayoutRoot"
        Property="Background"
        Value="{Binding Path=(Interaction:Behaviors.OriginalBgBrush), ElementName=LayoutRoot}" />