(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)\MSBuild\14.0\Bin\csc.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 = , Top = , Width =  };
     Button _btn2 = new Button { Text = "clone btn1's click event", Left = , Top = , Width =  };

     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!\nClick btn2 again.");
         };
         this.Controls.Add(_btn1);
         this.Controls.Add(_btn2);
         this.Width = ;
         this.Height = ;
     }
 }