无法分配给“方法”，因为它是“方法组”

Question

我无法运行我的代码，因为有一个错误提示：

无法分配给“OnNewLand”，因为它是“方法组”

这很奇怪，因为我使用了与其他方法相同的结构，并且它们没有问题。这是我的代码。

 private void CreateNewFlight()
        {
            string flightCode = ReadFlightCode();

            //Create the new bidder
            if (!string.IsNullOrEmpty(flightCode))
            {
                FlightWindow frm = new FlightWindow(Flightcode.Text);
                frm.Show();

                //Subscribe to the publisher's new bid and quit bid events
                frm.NewStart += OnNewStartClick;
                frm.NewChangeRoute += OnNewChangeRoute;
                frm.OnNewLand += OnNewLand; <----Here is the error <-------
            }
        }

无法分配给“OnNewLand”，因为它是“方法组”

我的另一个窗口：

public event EventHandler<Start> NewStart;
        public event EventHandler<ChangeRoute> NewChangeRoute;
        public event EventHandler<Land> NewLand;
private void btnStart_Click(object sender, RoutedEventArgs e)
        {

            Start startinfo = new Start(this.Title);
            OnNewStart(startinfo);   //Raise event   
            btnLand.IsEnabled = true;
            Routetxt.IsEnabled = true;
            changebtn.IsEnabled = true;
            btnStart.IsEnabled = false;
        }
        private void changebtn_Click(object sender, RoutedEventArgs e)
        {
            ChangeRoute changeinfo = new ChangeRoute(this.Title, Routetxt.Text);
            OnNewChangeRoute(changeinfo);   //Raise event   
        }
        private void btnLand_Click(object sender, RoutedEventArgs e)
        {
            Land landinfo = new Land(this.Title);
            OnNewLand(landinfo); //Raise event  
        }
        //Raise Event
        public void OnNewStart(Start e)
        {
            if (NewStart != null)
                NewStart(this, e);
        }

        public void OnNewChangeRoute(ChangeRoute e)
        {
            if (NewChangeRoute != null)
                NewChangeRoute(this, e);
        }

        public void OnNewLand(Land e)
        {
            if (NewLand != null)
                NewLand(this, e);
        }

Answer 1

你需要

frm.OnNewLand += NewLand;

代替

frm.OnNewLand += OnNewLand;

您可能有兴趣了解方法组的含义。访问这个线程。