c++-cli - 无法创建事件处理程序

Question

我正在尝试将事件绑定到菜单项。它编译。但是，当单击“关于”菜单项时，什么也没有发生。请帮忙！

ref class MenuEventListener
{
public:
    MenuEventListener (System::Windows::Forms::Form ^form)
    {
        this->form = form;
        this->form->Click += gcnew EventHandler (this, &MenuEventListener::AboutClick);
    }

private:
    System::Windows::Forms::Form^ form;
    void AboutClick (Object^ sender, System::EventArgs^ args)
    {
        System::String ^text = gcnew System::String ("This is an about message");
        System::String ^cap = gcnew System::String("About");

        System::Windows::Forms::MessageBox::Show (
            (IWin32Window^) Control::FromHandle (form->Handle),
            text, cap, 
            System::Windows::Forms::MessageBoxButtons::OK,
            System::Windows::Forms::MessageBoxIcon::Question);
    }

};

// Called in the form constructor
menuEventListener = gcnew MenuEventListener (this);

哦，如果有人可以解释事件处理程序的概念，具体来说，就是如何实际使用“类事件”及其与事件引发函数的关系，例如 OnClick。我明白了，但几乎没有。这样的人希望有人解释他们是否足够友善。

编辑：这是关于菜单的上下文

TextEditorMenu::TextEditorMenu ()
{
    // Create components
    menu = gcnew System::Windows::Forms::MainMenu ();
    fileMenuItem = gcnew System::Windows::Forms::MenuItem ();
    helpMenuItem = gcnew System::Windows::Forms::MenuItem ();
    newMenuItem = gcnew System::Windows::Forms::MenuItem ();
    openMenuItem = gcnew System::Windows::Forms::MenuItem ();
    saveMenuItem = gcnew System::Windows::Forms::MenuItem ();
    saveAsMenuItem = gcnew System::Windows::Forms::MenuItem ();
    aboutMenuItem = gcnew System::Windows::Forms::MenuItem ();

    // Intizlize components
    fileMenuItem->Text = "File";
    helpMenuItem->Text = "Help";
    aboutMenuItem->Text = "About";
    newMenuItem->Text = "New File";
    openMenuItem->Text = "Open File";
    saveMenuItem->Text = "Save";
    saveAsMenuItem->Text = "Save As";