wpf 跨线程操作UI控件

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

        private void MainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            this.Title = "哈哈哈";
          
            Task.Run(() =>
            {
                ///调度员
                this.Dispatcher.Invoke(() => {

                    button.Content = "确定";
                });
              
            });

            Task.Run(() =>
            {
                Application.Current.Dispatcher.Invoke(() => {

                    button.Content = "确定2";
                });

            });
        }