.net - Border 不继承 Control，那么 Control.Background 上的 setter 是如何工作的呢？

Question

由于 Border 不是从 Control 派生的，它是如何工作的？

    <Border.Style>
        <Style>
            <Style.Setters>
                <Setter Property="Control.Background" Value="LightBlue"/>
            </Style.Setters>
        </Style>
    </Border.Style>

Answer 1

Background WPF 中的依赖属性由许多类共享。它在Panel 类中定义，其他类只需对其调用AddOwner。

Border.cs

[CommonDependencyProperty]
public static readonly DependencyProperty BackgroundProperty =
    Panel.BackgroundProperty.AddOwner(
        typeof (Border),
        new FrameworkPropertyMetadata(null,
            FrameworkPropertyMetadataOptions.AffectsRender |
            FrameworkPropertyMetadataOptions.SubPropertiesDoNotAffectRender));

Panel.cs

[CommonDependencyProperty] 
public static readonly DependencyProperty BackgroundProperty =
    DependencyProperty.Register("Background", 
        typeof(Brush),
        typeof(Panel),
        new FrameworkPropertyMetadata((Brush)null,
            FrameworkPropertyMetadataOptions.AffectsRender | 
            FrameworkPropertyMetadataOptions.SubPropertiesDoNotAffectRender));