xaml WPF如何在加载c#窗口时显示进度条？

<Grid>
    <!-- 其他控件 -->
    <ProgressBar Name="progressBar" IsIndeterminate="True" Visibility="Collapsed" />
</Grid>

public MainWindow()
{
    InitializeComponent();
    Loaded += MainWindow_Loaded;
}

private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
    ShowProgressBar(); // 显示进度条
    // 进行其他耗时操作，例如加载数据等
    // 操作完成后调用 HideProgressBar() 方法隐藏进度条
}

private void ShowProgressBar()
{
    progressBar.Visibility = Visibility.Visible;
}

private void HideProgressBar()
{
    progressBar.Visibility = Visibility.Collapsed;
}