如何从WPF中的BackgroundWorker线程直接访问UI线程？

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
       <Button Content="Start" Click="Button_Click" />
    </Grid>
</Window>

using System.ComponentModel;
using System.Threading;
using System.Windows;

namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            BackgroundWorker worker = new BackgroundWorker();
            worker.DoWork += Worker_DoWork;
            worker.RunWorkerAsync();
        }

        private void Worker_DoWork(object sender, DoWorkEventArgs e)
        {
            // 在这里执行您的后台任务
            Thread.Sleep(5000);

            // 使用Dispatcher对象访问UI线程
            Dispatcher.Invoke(() =>
            {
                MessageBox.Show("Hello from UI thread!");
            });
        }
    }
}