C# 如何为子菜单项创建键盘快捷键

我正在使用wpf。我遇到的一个问题是为菜单项创建快捷键。 如何通过键盘快捷键调用子菜单项。 有人能知道这件事吗？请帮助我..提前谢谢。。 我的.xaml文件是

    <MenuItem Header="_Open file" Name="open" IsCheckable="True"  Click="file_click"  InputGestureText="ctrl+o">

 <MenuItem.InputBindings>
   <KeyBinding Key="O" Modifiers="control"/>
                </MenuItem.InputBindings>
            </MenuItem>

在您的XAML中尝试以下操作：

<Window.CommandBindings>
    <CommandBinding Command="Open" Executed="CommandBinding_Executed" />
</Window.CommandBindings>
<Window.InputBindings>
    <KeyBinding Command="Open" Key="O" Modifiers="control" />
</Window.InputBindings>
<Grid>
    <MenuItem Header="_Open file" Name="open" IsCheckable="True" Command="Open"  InputGestureText="ctrl+o" DockPanel.Dock="Top">            
    </MenuItem>        
</Grid>

---

它在command=“open”处生成错误。错误是“无法将属性“command”中的字符串“open”转换为类型为“System.Windows.Input.ICommand”的对象。CommandConverter无法从System.string转换。”

<Window.CommandBindings>
    <CommandBinding Command="Open" Executed="CommandBinding_Executed" />
</Window.CommandBindings>
<Window.InputBindings>
    <KeyBinding Command="Open" Key="O" Modifiers="control" />
</Window.InputBindings>
<Grid>
    <MenuItem Header="_Open file" Name="open" IsCheckable="True" Command="Open"  InputGestureText="ctrl+o" DockPanel.Dock="Top">            
    </MenuItem>        
</Grid>

 private void CommandBinding_Executed(object sender, ExecutedRoutedEventArgs e) {
        OpenFileDialog ofd;
        ofd = new OpenFileDialog();
        ofd.AddExtension = true;
        ofd.DefaultExt = "*.*";
        ofd.Filter = "media (*.*)|*.*";
        ofd.ShowDialog();
    }