我试着写一个简单的（独立的）C＃扩展方法做淡入一个通用的WPF的UIElement的，但解决方案（和code样品），我发现都含有大量的运动部件（比如设置了一个故事，等...）

有关参考这里是API的方法，我想创建类型的一个例子。这code将根据提供的值旋转的UIElement的（fromValue，toValue，持续时间和环路）

的公共静态牛逼旋转＆LT; T＆GT;（这件T的UIElement，双fromValue，双toValue，诠释durationInSeconds，布尔loopAnimation）
    其中T：的UIElement
{
    返回（T）uiElement.wpfInvoke（
            （）=＆GT; {
                    DoubleAnimation是DoubleAnimation是=新DoubleAnimation是（fromValue，toValue，新的持续时间（TimeSpan.FromSeconds（durationInSeconds）））;
                    RotateTransform rotateTransform =新RotateTransform（）;
                    uiElement.RenderTransform = rotateTransform;
                    uiElement.RenderTransformOrigin =新System.Windows.Point（0.5，0.5）;
                    如果（loopAnimation）
                        doubleAnimation.RepeatBehavior = RepeatBehavior.Forever;
                    rotateTransform.BeginAnimation（RotateTransform.AngleProperty，DoubleAnimation是）;
                    返回的UIElement;
                }）;
}
 

解决方案

听起来你正在寻找这样的事情：

 公共静态牛逼淡入＆LT; T＆GT;（这件T的UIElement，诠释durationInSeconds）
{
  返回uiElement.FadeFromTo（0，1，durationInSeconds，假）;
}
公共静态牛逼淡出＆LT; T＆GT;（这件T的UIElement，诠释durationInSeconds）
{
  返回uiElement.FadeFromTo（1，0，durationInSeconds，假）;
}

公共静态牛逼FadeFromTo＆LT; T＆GT;（这件T的UIElement，
                              双fromOpacity，双toOpacity，
                              INT durationInSeconds，布尔loopAnimation）
其中T：的UIElement
{
  返回（T）uiElement.wpfInvoke（（）=＆GT;
  {
    VAR DoubleAnimation是=
      新DoubleAnimation是（fromOpacity，toOpacity，
                          新持续时间（TimeSpan.FromSeconds（durationInSeconds）））;
    如果（loopAnimation）
      doubleAnimation.RepeatBehavior = RepeatBehavior.Forever;
    uiElement.BeginAnimation（UIElement.OpacityProperty，DoubleAnimation是）;
    返回的UIElement;
   }）;
}
 

I'm trying to write a simple (stand alone) C# extension method to do a Fade-In of a generic WPF UIElement, but the solutions (and code samples) that I found all contain a large number of moving parts (like setting up a story, etc...)

For reference here is an example of the type of API method I would like to create. This code will rotate an UIElement according to the values provided (fromValue, toValue, duration and loop)

public static T rotate<T>(this T uiElement, double fromValue, double toValue, int durationInSeconds, bool loopAnimation)
    where T : UIElement
{
    return (T)uiElement.wpfInvoke(
            ()=>{
                    DoubleAnimation doubleAnimation = new DoubleAnimation(fromValue, toValue, new Duration(TimeSpan.FromSeconds(durationInSeconds)));
                    RotateTransform rotateTransform = new RotateTransform(); 
                    uiElement.RenderTransform = rotateTransform;
                    uiElement.RenderTransformOrigin = new System.Windows.Point(0.5, 0.5);  
                    if (loopAnimation)
                        doubleAnimation.RepeatBehavior = RepeatBehavior.Forever;
                    rotateTransform.BeginAnimation(RotateTransform.AngleProperty, doubleAnimation);
                    return uiElement;
                });
}

Sounds like you're looking for something like this:

public static T FadeIn<T>(this T uiElement, int durationInSeconds)
{
  return uiElement.FadeFromTo(0, 1, durationInSeconds, false);
}
public static T FadeOut<T>(this T uiElement, int durationInSeconds)
{
  return uiElement.FadeFromTo(1, 0, durationInSeconds, false);
}

public static T FadeFromTo<T>(this T uiElement,
                              double fromOpacity, double toOpacity,
                              int durationInSeconds, bool loopAnimation)
where T : UIElement
{
  return (T)uiElement.wpfInvoke(()=>
  {
    var doubleAnimation =
      new DoubleAnimation(fromOpacity, toOpacity,
                          new Duration(TimeSpan.FromSeconds(durationInSeconds)));
    if(loopAnimation)
      doubleAnimation.RepeatBehavior = RepeatBehavior.Forever;
    uiElement.BeginAnimation(UIElement.OpacityProperty, doubleAnimation);
    return uiElement;
   });
}