如何在WPF应用程序中将ResourceDictionary动态添加到MergedDictionaries

Question

我有代码的下一个WPF部分：

<Page.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Languages/English.xaml"/>
            <ResourceDictionary Source="Languages/Romana.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Page.Resources>

如何从这些ResourceDictionarys的代码中选择？

编辑：

<Page.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="Languages/English.xaml"/>
            <ResourceDictionary Source="Languages/Romana.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Page.Resources>

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <ScrollViewer HorizontalScrollMode="Auto" HorizontalScrollBarVisibility="Hidden" VerticalScrollMode="Disabled" VerticalScrollBarVisibility="Hidden"  BorderThickness="0,3,0,3" BorderBrush="Aqua">
        <StackPanel Orientation="Horizontal">
            <AppBarToggleButton x:Name="Connect_toggle" Label="{StaticResource connect}" HorizontalAlignment="Stretch" Icon="Accept" VerticalAlignment="Stretch" d:LayoutOverrides="Width" Click="Connect_toggle_Click"/>
            <AppBarToggleButton x:Name="Options_toggle" Label="{StaticResource options}" HorizontalAlignment="Stretch" Icon="Accept" VerticalAlignment="Stretch" d:LayoutOverrides="Width" Click="Options_toggle_Click"/>
        </StackPanel>
    </ScrollViewer>

我没有指定我正在使用Windows Universal（VS2015）。

Answer 1

您可以动态选择ResourceDictionary文件， MergedDictionaries使用C＃代码隐藏将其添加到MergedDictionaries中，如以下代码片段所示：

    // prefix to the relative Uri for resource (xaml file)
    string _prefix = String.Concat(typeof(App).Namespace, ";component/");

    // clear all ResourceDictionaries
    this.Resources.MergedDictionaries.Clear();

    // add ResourceDictionary
    this.Resources.MergedDictionaries.Add
    (
        new ResourceDictionary { Source = new Uri(String.Concat(_prefix + "Languages/English.xaml", UriKind.Relative) }
    );

其中“ Languages/English.xaml ”是与示例相关的所选ResourceDictionary文件的示例相对路径。

希望这会有所帮助。