将样式应用于Silverlight 4中的子元素

Question

在Silverlight 4中（使用Expression Blend 4），如何在包含它的Border的样式中更改TextBox的字体大小？我将风格从WPF转换为Silverlight（总是很有趣）。这是我有：

<Style x:Key="Title" TargetType="Border"> 
    <Setter Property="TextBlock.VerticalAlignment" Value="Center"/> 
    <Setter Property="TextBlock.TextAlignment" Value="Center"/> 
    <Setter Property="TextBlock.FontSize" Value="48"/> 
    <Setter Property="TextBlock.Foreground" Value="{StaticResource TextForeground}"/> 
    <Setter Property="VerticalAlignment" Value="Top"/> 
    <Setter Property="HorizontalAlignment" Value="Stretch"/> 
    <Setter Property="Background" Value="{StaticResource TitleBackground}"/> 
    <Setter Property="Padding" Value="25,0"/> 
</Style> 

它不工作。它给我的设计师以下异常：

编辑：

好吧，我知道这是可能在WPF。在Silverlight中是不可能的（没有像Xin建议的那样采用整个主题构造）

Answer 1

实际上，您可能可以从silverlight工具包主题中获得所需内容。你可以找到它here（主题 - >主题浏览器）。

更新：

首先，你需要创建从主题（System.Windows.Controls.Theming）继承的类。我基本上从源代码复制并重命名它。

/// <summary> 
    /// Implicitly applies the border theme to all of its descendent 
    /// FrameworkElements. 
    /// </summary> 
    /// <QualityBand>Preview</QualityBand> 
    public class BorderTheme : Theme 
    { 
     /// <summary> 
     /// Stores a reference to a Uri referring to the theme resource for the class. 
     /// </summary> 
     private static Uri ThemeResourceUri = new Uri("/theming;component/Theme.xaml", UriKind.Relative); 

     /// <summary> 
     /// Initializes a new instance of the ExpressionDarkTheme class. 
     /// </summary> 
     public BorderTheme() 
      : base(ThemeResourceUri) 
     { 
      var a = ThemeResourceUri; 
     } 

     /// <summary> 
     /// Gets a value indicating whether this theme is the application theme. 
     /// </summary> 
     /// <param name="app">Application instance.</param> 
     /// <returns>True if this theme is the application theme.</returns> 
     public static bool GetIsApplicationTheme(Application app) 
     { 
      return GetApplicationThemeUri(app) == ThemeResourceUri; 
     } 

     /// <summary> 
     /// Sets a value indicating whether this theme is the application theme. 
     /// </summary> 
     /// <param name="app">Application instance.</param> 
     /// <param name="value">True if this theme should be the application theme.</param> 
     public static void SetIsApplicationTheme(Application app, bool value) 
     { 
      SetApplicationThemeUri(app, ThemeResourceUri); 
     } 
    } 

然后，您只需创建一个资源字典并将其命名为Theme.xaml，并将所有样式放入其中。

<ResourceDictionary 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 

<Style TargetType="Border"> 
    <Setter Property="VerticalAlignment" Value="Top"/>  
    <Setter Property="HorizontalAlignment" Value="Stretch"/>  
    <Setter Property="Background" Value="{StaticResource TitleBackground}"/> 
    <Setter Property="Padding" Value="25,0"/> 
</Style> 

<Style TargetType="TextBlock"> 
    <Setter Property="VerticalAlignment" Value="Center"/>  
    <Setter Property="TextAlignment" Value="Center"/>  
    <Setter Property="FontSize" Value="48"/>  
    <Setter Property="Foreground" Value="{StaticResource TextForeground}"/> 
</Style> 
</ResourceDictionary> 

最后，用它包裹你的边框！

<local:BorderTheme> 
     <Border> 
      <TextBlock Text="TextBlock"/> 
     </Border> 
    </local:BorderTheme> 

就是这样。您应该能够看到应用于边框的样式以及TextBlock。 :)