如何在Silverlight中合并样式？

Question

我的目标是扩展一个对象已经设置的样式。假设我有以下两种样式：

<Style TargetType="Ellipse" x:Key="OriginalStyle">
    <Setter Property="Fill" Value="Blue"/>
    <Setter Property="Width" Value="100"/>
    <Setter Property="Height" Value="200"/>
</Style>
<Style TargetType="Ellipse" x:Key="NewStyle">
    <Setter Property="Fill" Value="Red"/>
</Style>

我想要做的是将OriginalStyle分配给椭圆形，然后稍后只更改它所影响的属性应用第二个样式。因此，理想情况下，我想要做的是像这样做：

Style OriginalStyle;
Style NewStyle;
Ellipse ellipse = new Ellipse();
ellipse .Style = OriginalStyle;
// Later in an event hanler
ellipse.Style = NewStyle; // I would want to keep the settings from the old style in here: in this example setting the style like this would make me lose the Width and Height properties!

我曾尝试动态构建一个新样式，并添加NewStyle和OldStyle的属性，但是样式的Property属性始终为空，这导致了失败:

Style combinedStyle = new Style();
foreach (Setter setter in Old.Setters)
{
     combinedStyle.Setters.Add(setter);  // Get exception "Element is already the child of another element."
}
foreach (Setter setter in NewStyle.Setters)
{
     combinedStyle.Setters.Add(setter);  // Get exception "Element is already the child of another element."
}

似乎在Silverlight中没有动态合并样式的方法。有人能否确认这一点或向我展示更好的方法来实现合并？

- Gergely Orosz

Answer 1

"BasedOn" 在 Silverlight 中是否可用？// WPF 开发者，从未确定

- Ana Betts

Answer 2

您可以简单地这样做：-

<Style TargetType="Ellipse" x:Key="OriginalStyle">
    <Setter Property="Fill" Value="Blue"/>
    <Setter Property="Width" Value="100"/>
    <Setter Property="Height" Value="200"/>
</Style>
<Style TargetType="Ellipse" x:Key="NewStyle" BasedOn="{StaticResource OriginalStyle}">
    <Setter Property="Fill" Value="Red"/>
</Style>

请注意，这种Style元素的出现顺序很重要，您不能将样式基于尚未被XAML解析器处理的内容。

- AnthonyWJones