我知道您可以使用EventManager該類將類處理程序注冊到路由事件，以便在為該類對象觸發該事件時使類的所有實例做出響應：EventManager.RegisterClassHandler( typeof( TextBox ), Control.MouseDoubleClickEvent,    new RoutedEventHandler( ( S, E ) => ( E.OriginalSource as TextBox )?.SelectAll( ) ) );我正在尋找的是一種方法來做類似的事情，附加DependencyProperty到DataBinding使用該特定屬性的控件類型的所有實例。符合最小、完整和可驗證示例要求...應用程序.xaml.cs：using System;using System.ComponentModel;using System.Windows;using System.Windows.Controls;namespace MCVE {    /// <summary>    /// Interaction logic for App.xaml    /// </summary>    public partial class App : INotifyPropertyChanged {        public static readonly DependencyProperty FooProperty;        public event PropertyChangedEventHandler PropertyChanged;        static App( ) {            EventManager.RegisterClassHandler(                typeof( TextBox ), Control.MouseDoubleClickEvent,                new RoutedEventHandler(                    ( S, E ) => ( E.OriginalSource as TextBox )?.SelectAll( ) ) );            FooProperty = DependencyProperty.RegisterAttached(                    "Foo", typeof( string ), typeof( App) );            //Is it possible to bind the FooProperty of all Window objects to            //the FooSource property defined below in similar fashion             //to how one can call RegisterClassHandler above?        }        [STAThread]        public static int Main( ) {            App program = new App( );            program.InitializeComponent( );            return program.Run( );        }        protected override void OnStartup( StartupEventArgs e ) {            this.FooSource = "Baz";            base.OnStartup( e );        }        public static string GetFoo( Window w ) =>            w.GetValue( FooProperty ).ToString( );        public static void SetFoo( Window w, string value ) =>            w.SetValue( FooProperty, value );因此，所需的行為是，在啟動程序后，之后創建的任何窗口都將通過某些數據綁定行為將FooProperty值設置為"Baz"（這樣，如果FooSource屬性更改，則每個窗口FooProperty屬性也將更改）。這可能嗎？