C# 如何在C代码中设置dropshadoweffect的不透明度动画？

如何在代码中设置DropShadow效果不透明度的动画。我在UI中动态创建StackPanel，其中包含图像和文本块。我已经对图像应用了DropShadow效果，我想为不透明度设置动画。以下是我所拥有的：

Image img = ch.ChannelLogo;  //Create the image for the button
img.Height = channelStackPnl.Height * .66;

DropShadowEffect dSE = new DropShadowEffect();
dSE.Color = Colors.White;
dSE.Direction = 25;
dSE.ShadowDepth = 10;
dSE.Opacity = .40;
img.Effect = dSE;

DoubleAnimation animateOpacity = new DoubleAnimation();
animateOpacity.From = 0;
animateOpacity.To = 1;
animateOpacity.AutoReverse = true;
animateOpacity.RepeatBehavior = RepeatBehavior.Forever;
animateOpacity.Duration = new Duration(new TimeSpan(0, 0, 0, 0, 400));

//Here's where I am stuck.  How do I specifically target the opacity of the effect propery?
img.BeginAnimationimg.BeginAnimation(DropShadowEffect.OpacityProperty,animateOpacity);

也许

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（您正在制作效果动画，而不是图像）

感谢您抽出时间回复！为什么这不是正确答案@本

dSE.BeginAnimation(DropShadowEffect.OpacityProperty, animateOpacity);