我在一个模板中使用DynamicResource,并在使用该模板的每个样式中使用StaticResourceExtensions作为资源,以便在每个样式中对DynamicResource进行不同的评估。
问题是,我得到了这个错误:
Unable to cast object of type 'System.Windows.Media.Effects.DropShadowEffect' to type 'System.Windows.ResourceDictionary'下面是我的代码:
<DropShadowEffect
x:Key="Sombra"
Opacity="0.5"
ShadowDepth="3"
BlurRadius="5"
/>
<ControlTemplate
x:Key="ControleGeometriaTemplate"
TargetType="{x:Type Control}"
>
<Border
x:Name="border"
Background="{TemplateBinding Background}"
Width="{TemplateBinding Width}"
Height="{TemplateBinding Height}"
/>
<Path
x:Name="ícone"
Fill="{TemplateBinding Foreground}"
Effect="{DynamicResource PathShadow}"
/>
</Border>
</ControlTemplate>
<Style x:Key="BotãoGeometria" TargetType="{x:Type ButtonBase}">
<Setter Property="Template" Value="{StaticResource ControleGeometriaTemplate}"/>
</Style>
<Style
x:Key="BotãoNavegaçãoBase"
TargetType="{x:Type ButtonBase}"
BasedOn="{StaticResource BotãoGeometria}"
>
<Style.Resources>
<StaticResource x:Key="PathShadow" ResourceKey="Sombra"/>
</Style.Resources>
</Style>发布于 2016-12-10 04:32:47
据我所知,StaticResourceExtension在some situations中不能正常工作。
看起来你也发现了类似的情况:
<SolidColorBrush x:Key="RedBrush" Color="Red" />
<Style TargetType="TextBox" x:Key="Test">
<Style.Resources>
<StaticResourceExtension x:Key="NewRedBrushKey" ResourceKey="RedBrush" />
</Style.Resources>
</Style>在Window中使用Test样式就足以重现您的问题。
所以我的建议是使用你自己的扩展:
public class ResourceFinder : System.Windows.Markup.MarkupExtension
{
public override object ProvideValue(IServiceProvider serviceProvider)
{
FrameworkElement frameworkElement;
IDictionary dictionary;
IRootObjectProvider rootObjectProvider = (IRootObjectProvider)
serviceProvider.GetService(typeof(IRootObjectProvider));
if (rootObjectProvider != null)
{
dictionary = rootObjectProvider.RootObject as IDictionary;
if (dictionary != null)
{
return dictionary[ResourceKey];
}
else
{
frameworkElement = rootObjectProvider.RootObject as FrameworkElement;
if (frameworkElement != null)
{
return frameworkElement.TryFindResource(ResourceKey);
}
}
}
return null;
}
public object ResourceKey
{
get;
set;
}
}那么你的风格就会变成:
<Style
x:Key="BotãoNavegaçãoBase"
TargetType="{x:Type ButtonBase}"
BasedOn="{StaticResource BotãoGeometria}">
<Style.Resources>
<local:ResourceFinder x:Key="PathShadow" ResourceKey="Sombra" />
</Style.Resources>
</Style>我希望这能帮助你解决你的问题。
发布于 2016-12-10 04:43:19
我很确定这是一个与BAML编译相关的bug。如果在运行时使用XamlReader.Parse动态编译,代码将正常工作。我想,这也可以用作变通方法。
https://stackoverflow.com/questions/41062079
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