WPF,给颜色SolidColorBrush添加动画

/// <summary>
        /// 设置颜色动画
        /// </summary>
        /// <returns></returns>
        private SolidColorBrush ColorAnimation()
        {

            ColorAnimationUsingKeyFrames colorAnimation = new ColorAnimationUsingKeyFrames();
            colorAnimation.Duration = TimeSpan.FromSeconds(1);
            colorAnimation.FillBehavior = FillBehavior.Stop;
            colorAnimation.KeyFrames.Add(new DiscreteColorKeyFrame(Brushes.Red.Color, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(0.5))));
            colorAnimation.KeyFrames.Add(new DiscreteColorKeyFrame(Brushes.Transparent.Color, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(1))));
            colorAnimation.KeyFrames.Add(new DiscreteColorKeyFrame(Brushes.Red.Color, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(1.5))));           
            SolidColorBrush background = new SolidColorBrush();
            AnimationClock myClock = colorAnimation.CreateClock();
            background.ApplyAnimationClock(SolidColorBrush.ColorProperty, myClock);
            return background;
        }