如何在Xamarin.Forms wpf应用程序中更改标题栏背景颜色？

<Style x:Key="CustomTitleBarStyle" TargetType="controls:MvxTitleBar">
    <Setter Property="Background" Value="YourDesiredColor" />
</Style>

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="App.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

public App()
{
    InitializeComponent();

    // 应用自定义标题栏样式
    MainPage = new MainPage();
    MainPage.SetValue(NavigationPage.TitleViewProperty, new Style(typeof(NavigationPage)) { BasedOn = (Style)Application.Current.Resources["CustomTitleBarStyle"] });
}