WPF应用程序MenuItem的快捷键失效？！

Question

如：
<MenuItem Header="hi" InputGestureText="Ctrl+E" Click="MenuItem_Click" />        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Testing");
        }运行时按下Ctrl+E不能弹出对话框，点击可以跳出，请问是哪里出错了？

Answer 1

此属性没有将输入笔势与菜单项相关联；它只是向菜单项中添加了文本。应用程序必须处理用户的输入才能执行该操作。有关如何将命令与菜单项关联的信息，请参见 Command。你需要通过绑定命令的方式处理快捷键操作，可参考http://srndolha.wordpress.com/2008/03/06/setting-inputgesturetext-on-a-menuitem-bound-to-a-command-in-wpf/

Answer 2

现在解决了，另外问一下：为什么加了Command就变成灰色的了？

Answer 3

你自己写的Command还是用系统的Command？看看Command的CanExecute方法里有什么限制条件，如果CanExecute返回false，则按钮会不可点击

Answer 4

        public MainWindow()
        {
            InitializeComponent();
            CommandBindings.Add(new CommandBinding(CustomCommands.ExitCommand, MenuItemClick, CanExecute));
        }        public void CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = true;
        }这样子写是灰色的

Answer 5

给MenuItem定义个名称，然后试一下下面方法行不行menuItem.Add(new CommandBinding(CustomCommands.ExitCommand, MenuItemClick, CanExecute));

Answer 6

写错了，应该这样
menuItem.CommandBindings.Add(new CommandBinding(CustomCommands.ExitCommand, MenuItemClick, CanExecute));

Answer 7

或者，你不用CustomCommands.ExitCommand，自己写一个简单的Command测试下Command是否可用
        public static RoutedCommand ExitCommand= new RoutedCommand();
        public Window1()
        {
            InitializeComponent();
        }        // ExecutedRoutedEventHandler for the custom color command.
        private void ExitCommandExecuted(object sender, ExecutedRoutedEventArgs e)
        {
            MessageBox.Show(e.OriginalSource.ToString());
        }        // CanExecuteRoutedEventHandler for the custom color command.
        private void ExitCommandCanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
              e.CanExecute = true;        }XAML
<Window...
xmlns:custom="clr-namespace:Sample"/>
...
...
<Window.CommandBindings>
    <CommandBinding Command="{x:Static custom:Window1.ExitCommand}"
                    Executed="ExitCommandExecuted"
                    CanExecute="ExitCommandCanExecute"/>
  </Window.CommandBindings>
  ...
   ...
   <MenuItem Header="Color Command"
                  Command="{x:Static custom:Window1.ExitCommand}" />
      </MenuItem>