WPF使用ICommand在WebBrowser中创建带有ContextMenu的ListView

Question

我试图在WebBrowser中创建一个带有ContextMenu的ListView，然后使用ICommand进行绑定。但是，下面列出的示例在运行时，我会得到以下错误：System.Windows.Data错误：4：无法找到引用'RelativeSource FindAncestor,祖先Type='System.Windows.Controls.ListView',祖先Level='1''的绑定源。BindingExpression:path=datacontext.mycode；DataItem=null；目标元素是'menuitem'(name='')；目标属性为“Command”（类型为“Icommand”）

        <!--WebBrowser to Display Messages-->
        <WebBrowser Name="webBrowser"
                    Source="http://www.whatever.com" 
                   <!--OnContextMenuOpening event in LoadCompleted-->                       
                    LoadCompleted="webBrowser_LoadCompleted">

            <WebBrowser.Resources>
                <!--Show items on webBrowser on mouserightclick-->
                <ListView x:Key="wbListView">
                    <ListView.Resources>
                        <ContextMenu x:Key="wbContextMenu" >
                            <MenuItem Header="Test" CommandParameter="{Binding}" Command="{Binding Path=DataContext.myCode, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ListView}}"/>
                        </ContextMenu>
                    </ListView.Resources>
                    <ListView.ItemContainerStyle>
                        <Style TargetType="{x:Type ListViewItem}">
                            <Setter Property="ContextMenu" Value="{StaticResource wbContextMenu}"/>
                        </Style>
                    </ListView.ItemContainerStyle>
                </ListView>
            </WebBrowser.Resources>

        </WebBrowser>

下面是我的代码:C#

    public myCodeCommand myCode
    {
        get { return new myCodeCommand(this); }
    }

    public class myCodeCommand : ICommand
    {           
        public bool CanExecute(object parameter)
        {
            Console.WriteLine("WEBBROWSER SEND MESSAGE CAN EXECUTE?");
            return true;
        }

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }

        public void Execute(object parameter)
        {
            Console.WriteLine("WEBBROWSER SEND MESSAGE EXECUTE SOMETHING");
        }
    }

Answer 1

我能够在Xaml中创建ContextMenu，如下所示：

     <WebBrowser.ContextMenu>
          <ContextMenu x:Name="wbContextMenu" >
               <MenuItem x:Name="menuItemOne" Header="Item 1" Click="menuItemOne_Click" />
               <MenuItem x:Name="menuItemTwo" Header="Item 2" Click="menuItemTwo_Click" />
          </ContextMenu>
     </WebBrowser.ContextMenu>

在wbContextMenu事件处理程序上，如下所示：仅供参考，每个菜单项都有自己的ClickEvent。

    DocumentEvents.oncontextmenu += webBrowserChat_ContextMenuOpening;

    private bool webBrowserChat_ContextMenuOpening(IHTMLEventObj pEvtObj)
    {
           wbContextMenu.PlacementTarget = pEvtObj as ContextMenu;
           wbContextMenu.IsOpen = true;
     }

    private void menuItemOne_Click(object sender, RoutedEventArgs e)
    {
           //Put whatever you want handled here for menuitem
    }

    private void menuItemTwo_Click(object sender, RoutedEventArgs e)
    {
           //Put whatever you want handled here for menuitem
    }