(CSharp)克隆控件事件

// https://stackoverflow.com/questions/6055038/how-to-clone-control-event-handlers-at-run-time
// "C:Program Files (x86)MSBuild14.0Bincsc.exe" /t:winexe /out:cloneevents.exe cloneevents.cs && start "cloneevents.exe" cloneevents.exe
using System;
using System.ComponentModel;
using System.Reflection;
using System.Windows.Forms;

static class Program {
    [STAThread]
    public static void Main(params string[] args){
        Application.Run(new Form1());
    }

    public static void CloneEvents(Control targetControl, Control activeContorl) {
        FieldInfo eventsField = typeof(Component).GetField("events", BindingFlags.NonPublic | BindingFlags.Instance);
        object eventHandlers = eventsField.GetValue(targetControl);
        eventsField.SetValue(activeContorl, eventHandlers);
    }
}


public class Form1 : Form {
    Button _btn1= new Button { Text = "btn1", Left = 20, Top = 10, Width = 180 };
    Button _btn2 = new Button { Text = "clone btn1's click event", Left = 20, Top = 40, Width = 180 };

    public Form1() {
        _btn1.Click+=(ss,se)=> MessageBox.Show(this, "btn1 is clicked.");
        _btn2.Click+=(ss,se)=> {
            Program.CloneEvents(_btn1, _btn2);
            MessageBox.Show(this, "Clone btn1's events OK!
Click btn2 again.");
        };
        this.Controls.Add(_btn1);
        this.Controls.Add(_btn2);
        this.Width = 240;
        this.Height = 120;
    }
}