Material 在 XAML 中设计覆盖样式不起作用

Question

我在使用 MaterialDesignInXamlToolkit 覆盖非常简单的 TextBox 样式时遇到困难。

据我所知，我已经按照 override instructions 这封信：

App.xaml

<Application x:Class="WpfApp1.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
                <ResourceDictionary Source="Themes/MaterialDesignTheme.Overrides.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

MainWindow.xaml

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:materialDesign="clr-namespace:MaterialDesignThemes.Wpf;assembly=MaterialDesignThemes.Wpf"
        Title="MainWindow" Height="400" Width="300">
    <Grid>
        <TextBox VerticalAlignment="Center"
                 x:Name="NameTextBox"
                 materialDesign:HintAssist.Hint="Name">
        </TextBox>
    </Grid>
</Window>

MaterialDesignTheme.Overrides.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:materialDesign="clr-namespace:MaterialDesignThemes.Wpf;assembly=MaterialDesignThemes.Wpf">

    <Style x:Key="MaterialDesignTextBox" 
           BasedOn="{StaticResource MaterialDesignTextBox}"
           TargetType="{x:Type TextBox}">
        <Setter Property="FontSize" Value="200" />
    </Style>

</ResourceDictionary>

但是，除非我从覆盖文件中的样式中删除 x:Key，否则文本框中的字体将保持在非常无聊的 12，而不是超级令人兴奋的 200 我在追。

我在 Github here 上创建了一个示例项目。如果有人能看一下，我将不胜感激。

Answer 1

问题在 MaterialDesignTheme.Overrides.xaml。您正在指定要覆盖的特定样式，但未引用包含该样式的资源字典。合并它会解决问题。

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.TextBox.xaml" />
    </ResourceDictionary.MergedDictionaries>

    <Style BasedOn="{StaticResource MaterialDesignTextBox}"
           TargetType="{x:Type TextBox}">
        <Setter Property="FontSize" Value="200" />
    </Style>
</ResourceDictionary>

Material 在 XAML 中设计覆盖样式不起作用

Material Design In XAML override style not working

material-design-in-xaml