public partial class WindowReadOnly : Window{public WindowReadOnly (){InitializeComponent();//用SetValue的方法来设置值DispatcherTimer timer =new DispatcherTimer(TimeSpan.FromSeconds(1),DispatcherPriority.Normal,(object sender, EventArgs e)=>{int newValue = Counter == int.MaxValue ? 0 : Counter + 1;SetValue(counterKey, newValue);},Dispatcher);}//属性包装器，只提供GetValuepublic int Counter{get { return (int)GetValue(counterKey.DependencyProperty); }}//用RegisterReadOnly来代替Register来注册一个只读的依赖属性private static readonly DependencyPropertyKey counterKey =DependencyProperty.RegisterReadOnly("Counter",typeof(int),typeof(WindowReadOnly),new PropertyMetadata(0));}

<Window x:Name="winReadOnly" x:Class="WpfApp1.WindowReadOnly"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"Title="WindowDepend" Height="300" Width="300"><Grid><Viewbox><TextBlock Text="{Binding ElementName=winReadOnly, Path=Counter}" /></Viewbox></Grid>
</Window>

   <Grid><Grid.RowDefinitions><RowDefinition Height="101*"/><RowDefinition Height="80"/><RowDefinition Height="80"/></Grid.RowDefinitions><StackPanel Grid.Row="0" >

<Canvas><Button Canvas.Top="20" Canvas.Left="20" Content="Knights Warrior!"/>
</Canvas>

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Media;namespace WpfApp1.Services{public class TurnoverManager : DependencyObject{//通过静态方法的形式暴露读的操作public static double GetAngle(DependencyObject obj){return (double)obj.GetValue(AngleProperty);}//通过静态方法的形式暴露写的操作public static void SetAngle(DependencyObject obj, double value){obj.SetValue(AngleProperty, value);}//通过使用RegisterAttached来注册一个附加属性public static readonly DependencyProperty AngleProperty =DependencyProperty.RegisterAttached("Angle", typeof(double), typeof(TurnoverManager), new PropertyMetadata(0.0, OnAngleChanged));//根据附加属性中的值，当值改变的时候，旋转相应的角度。private static void OnAngleChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e){var element = obj as UIElement;if (element != null){element.RenderTransformOrigin = new Point(0.5, 0.5);element.RenderTransform = new RotateTransform((double)e.NewValue);}}     }}

<Window x:Class="WpfApp1.WindowTurnover"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="clr-namespace:WpfApp1.Services"Title="WindowTurnover" Height="400" Width="500" Loaded="Window_Loaded"><Grid><Grid.RowDefinitions><RowDefinition Height="313*"/><RowDefinition Height="57*"/></Grid.RowDefinitions><Canvas Grid.Row="0"><Ellipse Name="ellipseRed" Fill="Red" Width="100" Height="60" Canvas.Left="56"Canvas.Top="98" local:TurnoverManager.Angle="{Binding ElementName=sliderAngle, Path=Value}"/><Rectangle Name="ellipseBlue" Fill="Blue" Width="80" Height="80" Canvas.Left="285"Canvas.Top="171" local:TurnoverManager.Angle="45" /><Button  Name="btnWelcome" Content="欢迎光临" Canvas.Left="265" Canvas.Top="48" FontSize="20" local:TurnoverManager.Angle="60"/></Canvas><WrapPanel Grid.Row="1"><Label Content="角度大小" /><Slider x:Name="sliderAngle" Minimum="0" Maximum="240" Width="300" /></WrapPanel></Grid></Window>