在WPF中,如何获取当前主题的按钮背景？

using System.Windows;
using System.Windows.Controls;

// 获取当前主题的按钮背景
public Brush GetButtonBackground()
{
    // 获取应用程序的资源字典
    ResourceDictionary resources = Application.Current.Resources;

    // 查找按钮背景样式资源
    Style buttonStyle = (Style)resources["Button.Background"];

    // 获取按钮背景样式中的背景属性
    Brush buttonBackground = buttonStyle.Setters
        .OfType<Setter>()
        .FirstOrDefault(s => s.Property.Name == "Background")
        ?.Value as Brush;

    return buttonBackground;
}