使用StoryBoard執行動畫

　　在WPF動畫程式設計中，最常用的動畫處理方式是DoubleAnimation動畫，但是隨著你的開發經驗越來越多，你會發現，有時候使用這個動畫類會很麻煩，因為這個動畫是封閉動畫，也就是說在動畫的時間間隔內，你不能對它做對應依賴屬性的賦值操作，這讓你很多時候止步於很好的想法。

　　因為我們要求某個時刻動畫能停止，屬效能賦值新的值。所以WPF中提供StoryBoard，這個和IOS中StoryBoard概念有點像，故事版嘛，就是一大堆事情放在同一塊進行統一處理，例如你對某個物件坐了多個屬性的動畫，這些動畫就可以用一個StoryBoard統一管理，極其方便。下面博主寫了一個StoryBoard的動畫，描述一個矩形位置移動，相信在你以後的開發當中會經常用到。

 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 = 0,
                To = 300,
                FillBehavior = FillBehavior.Stop,
                //AutoReverse = true,
                //RepeatBehavior = RepeatBehavior.Forever,
                Duration = TimeSpan.FromSeconds(2)
            };
            DoubleAnimation da1 = new DoubleAnimation()
            {
                From = 0,
                FillBehavior = FillBehavior.Stop,
                To = 300,
                //RepeatBehavior = RepeatBehavior.Forever,
                Duration = TimeSpan.FromSeconds(2)
            };
            Rectangle rect = new Rectangle();

            rect.Width = rect.Height = 100;
            rect.Fill = Brushes.Blue;
            _canvas.Children.Add(rect);

            rect1.Width = rect1.Height = 100;
            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>
        /// 開始動畫
        /// </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 = 3;
                Canvas.SetLeft(rect1, 100);
            };
            bsCopy.Begin();
        }
        /// <summary>
        /// 停止動畫
        /// </summary>
        Storyboard bsCopy;
        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            bsCopy.Stop();
            Canvas.SetLeft(rect1, 100);
        }
    }