WPF对某个元素进行淡入淡出

WPF对某个元素进行淡入淡出，例如对 ImagePage 元素进行淡入淡出，代码如下：

淡入

daV = new DoubleAnimation(0, 1, new Duration(TimeSpan.FromSeconds(1)));
this.ImagePage.BeginAnimation(UIElement.OpacityProperty, daV);

淡出

DoubleAnimation daV = new DoubleAnimation(1, 0, new Duration(TimeSpan.FromSeconds(1)));
this.ImagePage.BeginAnimation(UIElement.OpacityProperty, daV);