ShrlAlgoToolkit/Sample/MainWindow.xaml

<Window
    x:Class="Sample.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:Sample"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="MainWindow"
    Width="800"
    Height="450"
    mc:Ignorable="d">
    
    <Grid Background="{DynamicResource AppBackgroundBrush}">
        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
            <TextBlock
                FontSize="24"
                Foreground="{DynamicResource AppTextBrush}"
                Text="背景和文字都会渐变" />

            <Button
                x:Name="SwitchThemeButton"
                Margin="0,20,0,0"
                Padding="15,8"
                Click="SwitchThemeButton_Click"
                Content="切换主题" />
        </StackPanel>
    </Grid>
</Window>