如何将新特性添加到控件模板/样式中

Question

我刚刚创建了一个Expander样式，标题中有一个复选框：

<Style TargetType="{x:Type Expander}" x:Key="MyCheckboxExpander">
    <Setter Property="Background" Value="{StaticResource ExpanderBackgroundBrush}"/>
    <Setter Property="HeaderTemplate" Value="{StaticResource MyHeaderExpander}" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Expander}">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="*" x:Name="ContentRow"/>
                    </Grid.RowDefinitions>
                    <Border Grid.Row="0" x:Name="Border" Background="{TemplateBinding Background}" BorderThickness="1" 
                            BorderBrush="{StaticResource ExpanderBorderBrush}" CornerRadius="2,2,0,0">
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="18"/>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="20"/>
                            </Grid.ColumnDefinitions>
                            <CheckBox VerticalAlignment="Center" Margin="4,0,0,2"/>
                            <ToggleButton Grid.Column="2" x:Name="ToggleBt" Template="{DynamicResource MyExpanderToggleButton}" Background="{StaticResource ExpanderBackgroundBrush}" 
                                          IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" 
                                          OverridesDefaultStyle="True"/>
                            <ContentPresenter Grid.Column="1" Margin="0,0,0,0" RecognizesAccessKey="True" ContentSource="Header"/>
                        </Grid>
                    </Border>
                    <Border Visibility="Collapsed" Grid.Row="1" x:Name="ExpandSite" Background="{StaticResource ContentBackgroundBrush}"
                            BorderBrush="{StaticResource ExpanderBorderBrush}" BorderThickness="1,0,1,1" CornerRadius="0,0,2,2">
                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" 
                                          VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Focusable="false"/>
                    </Border>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsExpanded" Value="True">
                        <Setter Property="Visibility" Value="Visible" TargetName="ExpandSite"/>
                    </Trigger>
                    <Trigger Property="IsEnabled" Value="False">
                        <Setter Property="Background" Value="{StaticResource ExpanderBackgroundBrush}" TargetName="Border"/>
                        <Setter Property="BorderBrush" Value="{StaticResource ExpanderBackgroundBrush}" TargetName="Border"/>
                        <Setter Property="Visibility" Value="Hidden" TargetName="ToggleBt" />
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

如何为该扩展器创建新属性（IsChecked）以便绑定到布尔值？e.g:

<Expander IsChecked="{Binding MyBoolValue}" />

同样在模板上：

<CheckBox VerticalAlignment="Center" Margin="4,0,0,2" IsChecked="{TemplateBinding ????}" />

编辑：

我发现了一个类似的问题，但我想知道是否有其他方法可以在不使用控制继承的情况下做到这一点。

Answer 1

我创建了一个像这样的附加属性：

public sealed class AP : DependencyObject 
{
    public static bool GetIsChecked(DependencyObject obj)
    {
        return (bool)obj.GetValue(IsCheckedProperty);
    }
    public static void SetIsChecked(DependencyObject obj, bool value)
    {
        obj.SetValue(IsCheckedProperty, value);
    }
    // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty IsCheckedProperty =
        DependencyProperty.RegisterAttached("IsChecked", typeof(bool), typeof(AP), new UIPropertyMetadata(false));
}

然后我所要做的就是：

<Expander my:AP.IsChecked="{Binding Path=TestBool}" />   

在模板上：

<CheckBox VerticalAlignment="Center" Margin="4,0,0,2" IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=(my:AP.IsChecked)}" />

我想知道如果在不同的汇编中定义样式，该怎么办。。。