Xamarin:重复使用效果

Android项目

public class LabelShadowEffect : PlatformEffect
{
   protected override void OnAttached()
   {
      ...
   }

   protected override void OnDetached()
   {
      ...
   }
}

.netstandard库

public class ShadowEffect : RoutingEffect
{
   ...
}

<controls:FontAwesomeLabel

  ...

  <controls:FontAwesomeLabel.Effects>
     <effects:ShadowEffect
        DistanceX="2"
        DistanceY="2"
        Radius="2"
        Color="{StaticResource HeaderTextShadowColor}" />
  </controls:FontAwesomeLabel.Effects>
</controls:FontAwesomeLabel>

Element.Effects ,其定义如下

public System.Collections.Generic.IList<Xamarin.Forms.Effect> Effects { get; }

Effects="{StaticResource StandardShadowEffect}"

尝试1 system:ArraySegment

<system:ArraySegment x:Key="StandardShadowEffect" x:TypeArguments="Effect">

</system:ArraySegment>

System.ArrayTypeMismatchException:尝试将元素作为

尝试2

 <generic:List x:Key="StandardShadowEffect" x:TypeArguments="Effect">

 </generic:List>

类型与数组不兼容

:数组

<x:Array x:Key="StandardShadowEffect" x:TypeArguments="Effect">

</x:Array>

尝试4

<effects:ShadowEffect x:Key="StandardShadowEffect"
       DistanceX="2"
       DistanceY="2"
       Radius="2"
       Color="{StaticResource HeaderTextShadowColor}" />

奇怪的是,最后一次尝试编译而不抛出,但没有应用任何效果。