使用StoryBoard执行动画

　　在WPF动画编程中，最常用的动画处理方式是DoubleAnimation动画，但是随着你的开发经验越来越多，你会发现，有时候使用这个动画类会很麻烦，因为这个动画是封闭动画，也就是说在动画的时间间隔内，你不能对它做对应依赖属性的赋值操作，这让你很多时候止步于很好的想法。

　　因为我们要求某个时刻动画能停止，属性能赋值新的值。所以WPF中提供StoryBoard，这个和IOS中StoryBoard概念有点像，故事版嘛，就是一大堆事情放在同一块进行统一处理，例如你对某个对象坐了多个属性的动画，这些动画就可以用一个StoryBoard统一管理，极其方便。下面博主写了一个StoryBoard的动画，描述一个矩形位置移动，相信在你以后的开发当中会经常用到。

  public partial class Window1 : Window
     {
         public Window1()
         {
             InitializeComponent();
             Loaded += new RoutedEventHandler(Window1_Loaded);
         }
         Storyboard _sb = new Storyboard();
         Rectangle rect1 = new Rectangle();

         void Window1_Loaded(object sender, RoutedEventArgs e)
         {
             DoubleAnimation da = new DoubleAnimation()
             {
                 From = ,
                 To = ,
                 FillBehavior = FillBehavior.Stop,
                 //AutoReverse = true,
                 //RepeatBehavior = RepeatBehavior.Forever,
                 Duration = TimeSpan.FromSeconds()
             };
             DoubleAnimation da1 = new DoubleAnimation()
             {
                 From = ,
                 FillBehavior = FillBehavior.Stop,
                 To = ,
                 //RepeatBehavior = RepeatBehavior.Forever,
                 Duration = TimeSpan.FromSeconds()
             };
             Rectangle rect = new Rectangle();

             rect.Width = rect.Height = ;
             rect.Fill = Brushes.Blue;
             _canvas.Children.Add(rect);

             rect1.Width = rect1.Height = ;
             rect1.Fill = Brushes.Red;
             _canvas.Children.Add(rect1);

             _sb.Children.Add(da);
             Storyboard.SetTarget(da, rect);
             Storyboard.SetTargetProperty(da, new PropertyPath(Canvas.LeftProperty));
             _sb.Begin();
         }
         /// <summary>
         /// 开始动画
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void Button_Click(object sender, RoutedEventArgs e)
         {
             bsCopy = _sb.Clone();
             bsCopy.Children.Clear();
             foreach (var item in _sb.Children)
             {

                 bsCopy.Children.Add(item);
                 Storyboard.SetTarget(item, rect1);
                 Storyboard.SetTargetProperty(item, Storyboard.GetTargetProperty(item));
             }
             bsCopy.FillBehavior = FillBehavior.Stop;
             bsCopy.Completed += delegate
             {
                 int a = ;
                 Canvas.SetLeft(rect1, );
             };
             bsCopy.Begin();
         }
         /// <summary>
         /// 停止动画
         /// </summary>
         Storyboard bsCopy;
         private void Button_Click_1(object sender, RoutedEventArgs e)
         {
             bsCopy.Stop();
             Canvas.SetLeft(rect1, );
         }
     }