动画目标：必须是依赖属性。可以用于Double，Color，Point，Object类型。对应的动画类后面加Animation，下面代码演示旋转360°。

void OnButtonClick(object sender, RoutedEventArgs args)        {            Button btn = sender as Button;            //在x-y二维空间围着一个点旋转的变换            RotateTransform rotateTransform = btn.RenderTransform as RotateTransform;            // Create and define animation            DoubleAnimation anima = new DoubleAnimation();            anima.From = 0;            anima.To = 360;            anima.Duration = new Duration(TimeSpan.FromSeconds(0.5));            // Set attached properties            Storyboard.SetTarget(anima, rotateTransform);            Storyboard.SetTargetProperty(anima, new PropertyPath(RotateTransform.AngleProperty));            // Create storyboard, add animation, and fire it up!            Storyboard storyboard = new Storyboard();            storyboard.Children.Add(anima);            storyboard.Begin();        }

xaml例子：

 淡出效果动画：