public class BlinkAnimation : Animatable

     {

         /// <summary>

         /// 单例，保持所有闪烁的动画同步

         /// </summary>

         public static readonly BlinkAnimation Instance = new BlinkAnimation();

         public double BlinkOpacity

         {

             get { return (double)GetValue(BlinkOpacityProperty); }

             set { SetValue(BlinkOpacityProperty, value); }

         }

         // Using a DependencyProperty as the backing store for BlinkOpacity.  This enables animation, styling, binding, etc...

         public static readonly DependencyProperty BlinkOpacityProperty =

             DependencyProperty.Register("BlinkOpacity", typeof(double), typeof(BlinkAnimation), new PropertyMetadata(0.0));

         /// <summary>

         /// 闪烁动画，用于动画同步

         /// </summary>

         public BlinkAnimation()

         {

             try

             {

                 DoubleAnimationUsingKeyFrames doubleAnimation = new DoubleAnimationUsingKeyFrames

                 {

                     RepeatBehavior = RepeatBehavior.Forever,

                     Duration = TimeSpan.FromSeconds(1.5)

                 };

                 DiscreteDoubleKeyFrame ddkf1 = new DiscreteDoubleKeyFrame(0.0, KeyTime.FromTimeSpan(TimeSpan.FromSeconds()));

                 DiscreteDoubleKeyFrame ddkf2 = new DiscreteDoubleKeyFrame(1.0, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(0.75)));

                 doubleAnimation.KeyFrames.Add(ddkf1);

                 doubleAnimation.KeyFrames.Add(ddkf2);

                 if (BlinkOpacityProperty!=null)

                 {

                      BeginAnimation(BlinkOpacityProperty, doubleAnimation);

                 }

             }

             catch (Exception)

             {

                 // ignored

             }

         }

         protected override Freezable CreateInstanceCore()

         {

             return Instance;

         }

     }

   <!--闪烁动画同步控制类-->

             <ObjectDataProvider x:Key="BlinkerOdp"

                                 ObjectType="{x:Type animation:BlinkAnimation}" />

   <Rectangle Fill="White"

                                                                DataContext="{StaticResource BlinkerOdp}"

                                                                Opacity="{Binding BlinkOpacity}"

                                                                x:Name="rect"

                                                                Visibility="Collapsed" />