WPF 文本框自动获取焦点

public partial class MainWindow : Window
	{
		public MainWindow()
		{
			InitializeComponent();

			// 版本1，通过Background dispatcher
			this.Dispatcher.BeginInvoke(DispatcherPriority.Background,
				(Action)(() => { Keyboard.Focus(TextBox2); }));
			
			// 版本2，控件完全加载完毕后执行焦点设置
			//this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
		}

		void MainWindow_Loaded(object sender, RoutedEventArgs e)
		{
			Keyboard.Focus(TextBox2); 
		}
	}