1.資源字典定義：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="Button" x:Key="GroupBoxButton">
        <Setter Property="Width" Value="72"/>
        <Setter Property="Height" Value="30"/>
        <Setter Property="Margin" Value="5"/>
        <Setter Property="Background" Value="Black"/>
    </Style>
</ResourceDictionary>
 

 Button b = new Button();
 b.Style = FindResource("GroupBoxButton") as Style;