c# - WPF 样式不适用于运行时(但适用于设计器)

Question

我在 WPF 窗口中有这段代码:

<Window.Resources>
    <Style x:Key="MahappsStyle">
        <Style.Resources>
            <ResourceDictionary>
                <ResourceDictionary.MergedDictionaries>
                    <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
                    <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
                    <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
                    <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Blue.xaml" />
                    <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
                </ResourceDictionary.MergedDictionaries>
            </ResourceDictionary>
        </Style.Resources>
    </Style>
</Window.Resources>

我的想法是在我的应用程序中为单个元素启用字典中的外部样式。例如，它应该通过将样式“MahappsStyle”应用于名为“HamburgerMenu”的元素来工作:

<mahapps:HamburgerMenu x:Name="hamburgerMenu" Style="{StaticResource MahappsStyle}"
                    DisplayMode="CompactOverlay">
</mahapps:HamburgerMenu>

但这种方法似乎只在设计器中有效，而在运行时无效。我错过了什么？有没有其他方法可以将 MergedDictionaries 设置为单个元素？

更新。 找到了执行此操作的方法。首先需要在应用中创建Mahapps.xaml，内容如下:

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:mahapps="http://metro.mahapps.com/winfx/xaml/controls"
                    xmlns:local="clr-namespace:Promt.Desktop">

    <ResourceDictionary.MergedDictionaries >
        <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml"/>
        <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
        <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
        <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Blue.xaml" />
        <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
    </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

然后可以通过以下方式应用于单个元素:

<mahapps:HamburgerMenu>
            <mahapps:HamburgerMenu.Resources>
                <ResourceDictionary Source="pack://application:,,,/Promt.Desktop;component/Styles/Mahapps.xaml"/>
            </mahapps:HamburgerMenu.Resources>
</mahapps:HamburgerMenu>

我真的很失望 ResourceDictionary 不能保存 x:key 属性。如果有人知道另一种方法 - 请张贴。

UPDATE2。来自 Evk 的更好解决方案(基于 Laith 回答)。

Answer 1

Laith 的答案很接近但不完全，你需要这样做:

<Window.Resources>
    <ResourceDictionary>
        <ResourceDictionary x:Key="MahappsResources">
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Colors.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Blue.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </ResourceDictionary>
</Window.Resources>

然后你确实可以按键引用:

<mahapps:HamburgerMenu Resources="{StaticResource MahappsResources}" />

您需要再添加一个 ResourceDictionary 定义，否则它会将您的 MahappsResources 视为 Window.Resources(类似于 Window .Resources = new ResourceDictionary() ...) 并在其上设置 key 确实没有任何意义。当您再添加一个 ResourceDictionary - 现在您确实是 adding 您的 MahappsResources 到 Window.Resources 字典，给定键，因此可以通过该键引用它。