InputBinding and WebBrowser control

我有一个非常简单的应用程序，我试图将键盘快捷键绑定到绑定到菜单项的WPF命令。应用程序本身仅由一个Menu和一个WebBrowser控件组成。

当我在WebBrowser内时，键盘快捷键不会路由到WPF菜单。例如，在网页浏览器中输入"Ctrl+O"将显示IE打开的页面。此外，在这个应用程序中，除非我聚焦Menu(通过键入Alt)，否则输入绑定不会触发。例如，我无法通过单击标题栏然后键入快捷方式来关注WPF窗口。完整的代码复制如下:

MainWindow.xaml

<Window x:Class="TestInputBindingsOnMenu.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="600" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Menu IsMainMenu="True" x:Name="_mainMenu" Grid.Row="0" />
        <WebBrowser Source="http://google.com" Grid.Row="1" />
    </Grid>
</Window>

MainWindow.xaml.cs

using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace TestInputBindingsOnMenu
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            Initialize();
        }
        private void Initialize()
        {
            MenuItem fileMenu = new MenuItem();
            MenuItem fileNew = new MenuItem();
            MenuItem fileOpen = new MenuItem();
            MenuItem fileExit = new MenuItem();
            fileMenu.Header = "File";
            fileNew.Header = "New";
            fileOpen.Header = "Open";
            fileExit.Header = "Exit";
            fileMenu.Items.Add(fileNew);
            fileMenu.Items.Add(fileOpen);
            fileMenu.Items.Add(fileExit);
            _mainMenu.Items.Add(fileMenu);
            var fileNewCommand = CreateCommand("New");
            var fileOpenCommand = CreateCommand("Open");
            var fileExitCommand = CreateCommand("Exit");
            _mainMenu.CommandBindings.Add(new CommandBinding(fileNewCommand, ExecuteNew));
            _mainMenu.CommandBindings.Add(new CommandBinding(fileOpenCommand, ExecuteOpen));
            _mainMenu.CommandBindings.Add(new CommandBinding(fileExitCommand, ExecuteExit));
            fileNew.Command = fileNewCommand;
            fileOpen.Command = fileOpenCommand;
            fileExit.Command = fileExitCommand;
            _mainMenu.InputBindings.Add(new InputBinding(fileNewCommand, new KeyGesture(Key.N, ModifierKeys.Control)));
            _mainMenu.InputBindings.Add(new InputBinding(fileOpenCommand, new KeyGesture(Key.O, ModifierKeys.Control)));
            _mainMenu.InputBindings.Add(new InputBinding(fileExitCommand, new KeyGesture(Key.F4, ModifierKeys.Alt)));
        }
        private void ExecuteNew(object sender, ExecutedRoutedEventArgs e)
        {
            MessageBox.Show("New!!");
        }
        private void ExecuteOpen(object sender, ExecutedRoutedEventArgs e)
        {
            MessageBox.Show("Open!!");
        }
        private void ExecuteExit(object sender, ExecutedRoutedEventArgs e)
        {
            MessageBox.Show("Exit!!");
        }
        private static RoutedCommand CreateCommand(string label)
        {
            return new RoutedCommand(label, typeof(MainWindow));
        }
    }
}

Browser.InputBindings.Add(new KeyBinding(ApplicationCommands.Open, 
new KeyGesture(Key.O, ModifierKeys.Control)));