Better-Seewo/Manager/MainWindow.xaml.cs

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

namespace BetterSeewoManager;

public partial class MainWindow : Window
{
    private bool _isDarkTheme = true;

    public MainWindow()
    {
        InitializeComponent();
        ApplyTheme();
        ContentFrame.Navigate(new Uri("Pages/InstallPage.xaml", UriKind.Relative));
    }

    private void Tab_Click(object sender, RoutedEventArgs e)
    {
        if (sender is RadioButton rb && rb.Tag is string pageName)
        {
            var pageUri = new Uri($"Pages/{pageName}.xaml", UriKind.Relative);
            ContentFrame.Navigate(pageUri);
        }
    }

    private void BtnThemeToggle_Click(object sender, RoutedEventArgs e)
    {
        _isDarkTheme = !_isDarkTheme;
        ApplyTheme();
    }

    private void ApplyTheme()
    {
        var app = (App)Application.Current;
        app.Resources.MergedDictionaries.Clear();
        app.Resources.MergedDictionaries.Add(new ResourceDictionary
        {
            Source = new Uri(_isDarkTheme
                ? "Themes/DarkTheme.xaml"
                : "Themes/LightTheme.xaml", UriKind.Relative)
        });

        BtnThemeToggle.Content = _isDarkTheme ? "☀️" : "🌙";
        StatusText.Text = _isDarkTheme ? "已切换到深色主题" : "已切换到浅色主题";
    }
}