/// <summary>
    /// 用于附加属性的演示
    /// </summary>
    public class MyAttachedProperty
    {
        // 获取附加属性
        public static string GetSubTitle(DependencyObject obj)
        {
            return (string)obj.GetValue(SubTitleProperty);
        }

        // 设置附加属性
        public static void SetSubTitle(DependencyObject obj, string value)
        {
            obj.SetValue(SubTitleProperty, value);
        }

        // 注册一个附加属性
        public static readonly DependencyProperty SubTitleProperty =
            DependencyProperty.RegisterAttached(
                "SubTitle", // 附加属性的名称
                typeof(string), // 附加属性的数据类型
                typeof(MyAttachedProperty), // 附加属性所属的类
                new PropertyMetadata("", PropertyMetadataCallback)); // 指定附加属性的默认值，以及值发生改变时所调用的方法

        private static void PropertyMetadataCallback(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            object newValue = args.NewValue; // 发生改变之后的值
            object oldValue = args.OldValue; // 发生改变之前的值
        }
    }

<Page
    x:Class="XamlDemo.Controls.Basic.AttachedPropertyDemo"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:XamlDemo.Controls.Basic"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:myControls="using:MyControls"
    mc:Ignorable="d">

    <Grid Background="Transparent">
        <StackPanel Margin="120 0 0 0">

            <!--
                演示如何开发和使用自定义附加属性（本例所用到的自定义控件请参看：MyControls/MyControl.cs）
            -->
            <myControls:MyControl Background="Blue" BorderBrush="Yellow" BorderThickness="1" Width="100" HorizontalAlignment="Left"
                                  Title="{Binding Value, ElementName=slider}" myControls:MyAttachedProperty.SubTitle="{Binding Value, ElementName=slider}" /> //此处就使用附加属性

            <Slider Name="slider" Width="100" Minimum="0" Maximum="200" IsThumbToolTipEnabled="False"  HorizontalAlignment="Left" />
            
        </StackPanel>
    </Grid>
</Page>