引用其他样式的 UWP MergedDictionary 样式会引发错误

创建需要使用其他值的样式合并字典时遇到实际问题MergedDictionary (Brushes.xaml).

当我尝试从另一个文件引用它时，出现以下错误：

"Failed to assign to property 'Windows.UI.Xaml.ResourceDictionary.Source' because the type 'Windows.Foundation.String' cannot be assigned to the type 'Windows.Foundation.Uri'. [Line: x Position: y]"

例如。在资源词典中我有以下有效的内容..

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="Brushes.xaml" />
    </ResourceDictionary.MergedDictionaries>
    <Style TargetType="Button">
        <Setter Property="Background" Value="{StaticResource customBrush1}" />
        <Setter Property="Foreground" Value="{StaticResource customBrush2}" />

但是，这并不理想，因为我需要参考Brushes.xaml在每个样式资源字典中。所以我想做的是声明Brushes.xaml in App.xaml但我尝试的一切都会导致上述错误。它基本上不识别中定义的资源Brushes.xaml除非我将它们添加到每个单独的样式中。

例如。我想要什么（能够在 App.xaml 中执行操作）...

<Application x:Class="Test.UWP.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             RequestedTheme="Light">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="ms-appx:///Test.Xamarin.Forms.Themes.UWP/Brushes.xaml" />
                <ResourceDictionary Source="ms-appx:///Test.Xamarin.Forms.Themes.UWP/CustomStyles.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

CustomStyles.xaml包含

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="Styles\Button\BackButton.xaml" />
        <ResourceDictionary Source="Styles\Button\Default.xaml" />
        <ResourceDictionary Source="Styles\Button\HyperlinkBasicButton.xaml" />
        <ResourceDictionary Source="Styles\Button\HyperlinkButton.xaml" />
    </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

以及例如Styles\Button\Default.xaml包含..

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="Button">
        <Setter Property="Background" Value="{StaticResource CustomBrush1}" />
        <Setter Property="Foreground" Value="{StaticResource CustomBrush2}" />

其中 CustomBrush1 定义于Brushes.xaml.

我尝试过很多事情，例如尝试将 Brushes.xaml 添加到 CustomStyles.xaml - 不起作用。尝试将顺序更改为this https://learn.microsoft.com/en-us/windows/uwp/design/controls-and-patterns/resourcedictionary-and-xaml-resource-references声明它们应该按相反的顺序 - 这是行不通的。

非常感谢任何帮助，谢谢

根据评论，这是Brushes.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <SolidColorBrush x:Key="CustomBrush1"
                     Color="Black}" />
    <SolidColorBrush x:Key="CustomBrush2"
                     Color="White}" />
</ResourceDictionary>

根据您的描述，此行为是设计使然，派生出此document https://learn.microsoft.com/en-us/windows/uwp/design/controls-and-patterns/resourcedictionary-and-xaml-resource-references#lookup-behavior-for-xaml-resource-references我们可以找到。

然后，查找序列检查应用程序的运行时对象树中的下一个父对象......

如果你放置Brushes.xaml在专利层面，子层面Default.xaml无法获取画笔资源并抛出异常。最佳实践是参考Brushes.xaml在每个资源中，如上面提到的第一个场景。

And if Brushes.xaml and Default.xaml不在同一个文件夹中，我们需要使用ms-appx://方案参考一下。

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:TestApp.Styles.Button"
    >
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="ms-appx:///Brushes.xaml" />
    </ResourceDictionary.MergedDictionaries>
    <Style TargetType="Button">
        <Setter Property="Background" Value="{StaticResource CustomBrush1}" />
        <Setter Property="Foreground" Value="{StaticResource CustomBrush2}" />
    </Style>  
</ResourceDictionary>

然后将上面添加到CustomStyles.

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:TestApp"
    >
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="Styles/Button/Default.xaml" />
    </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

最后，我们只需要将 CustomStyles 添加到MergedDictionaries within App.xaml file

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="CustomStyles.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>