直接在控制哪个故事板动画已设置的上设置不透明度

Question

我可以正确设置UserControl不透明度属性，但不能绑定到Storyboard后。

UserControl MyControl;
MyControl.Opacity = 0.8;   /// This works before animation set

Storyboard sb = new Storyboard();
DoubleAnimation opacity = new DoubleAnimation();
opacity.From = 1;
opacity.To = 0;
opacity.Duration = TimeSpan.FromMilliseconds(400);
Storyboard.SetTarget(opacity, MyControl);
Storyboard.SetTargetProperty(opacity, new PropertyPath(UserControl.OpacityProperty));
sb.Children.Add(opacity);
sb.Begin();

sb.Completed += (object sender, EventArgs e) => {
  MyControl.Opacity = 0.5;   /// This doesn't work anymore
}

如何在Storyboard完成后使其有效？

Answer 1

在某些情况下，您可能无法在动画制作后更改属性的值。 你可以尝试：

sb.Completed += (object sender, EventArgs e) => {
 sb.Remove(MyControl);
  MyControl.Opacity = 0.5;
}

原因解释为How to: Set a Property After Animating It with a Storyboard