是的，从技术上讲是可能的。需要反思，因为许多成员都是私人和内部的。开始一个新的Windows Forms项目并添加两个按钮。然后：

using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Reflection;

namespace WindowsFormsApplication1 {
  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
      button1.Click += new EventHandler(button1_Click);
      // Get secret click event key
      FieldInfo eventClick = typeof(Control).GetField("EventClick", BindingFlags.NonPublic | BindingFlags.Static);
      object secret = eventClick.GetValue(null);
      // Retrieve the click event
      PropertyInfo eventsProp = typeof(Component).GetProperty("Events", BindingFlags.NonPublic | BindingFlags.Instance);
      EventHandlerList events = (EventHandlerList)eventsProp.GetValue(button1, null);
      Delegate click = events[secret];
      // Remove it from button1, add it to button2
      events.RemoveHandler(secret, click);
      events = (EventHandlerList)eventsProp.GetValue(button2, null);
      events.AddHandler(secret, click);
    }

    void button1_Click(object sender, EventArgs e) {
      MessageBox.Show("Yada");
    }
  }
}

如果这让你相信微软确实努力阻止你做这件事，那么你理解了这个代码。

不行，你不能这样做。原因是封装 - 事件只是订阅/取消订阅，即它们不会让你“窥视内部”以查看已订阅的处理程序。

你可以从Button类中派生，创建一个调用OnClick的公共方法。然后你只需要将btn1实例化该类，订阅一个调用btn1.RaiseClickEvent()或其他方法的btn2处理程序。

虽然我不确定我真的会推荐它。你实际上想做什么？有什么更大的画面吗？

编辑：我看到你已经接受了使用反射获取当前事件集的版本，但如果你对另一种在原始控件中调用OnXXX处理程序的选择感兴趣，我这里有个示例。我最初复制了全部事件，但实际上会导致一些非常奇怪的效果。请注意，这个版本意味着如果有人在调用CopyEvents之后订阅原始按钮中的事件，它仍然会被“连接”-即两个关联的时间无论何时都不会关系。

using System;
using System.Drawing;
using System.Reflection;
using System.Windows.Forms;

class Test
{
    static void Main()
    {

        TextBox output = new TextBox 
        { 
            Multiline = true,
            Height = 350,
            Width = 200,
            Location = new Point (5, 15)
        };
        Button original = new Button
        { 
            Text = "Original",
            Location = new Point (210, 15)
        };
        original.Click += Log(output, "Click!");
        original.MouseEnter += Log(output, "MouseEnter");
        original.MouseLeave += Log(output, "MouseLeave");

        Button copyCat = new Button
        {
            Text = "CopyCat",
            Location = new Point (210, 50)
        };

        CopyEvents(original, copyCat, "Click", "MouseEnter", "MouseLeave");

        Form form = new Form 
        { 
            Width = 400, 
            Height = 420,
            Controls = { output, original, copyCat }
        };

        Application.Run(form);
    }

    private static void CopyEvents(object source, object target, params string[] events)
    {
        Type sourceType = source.GetType();
        Type targetType = target.GetType();
        MethodInfo invoker = typeof(MethodAndSource).GetMethod("Invoke");
        foreach (String eventName in events)
        {
            EventInfo sourceEvent = sourceType.GetEvent(eventName);
            if (sourceEvent == null)
            {
                Console.WriteLine("Can t find {0}.{1}", sourceType.Name, eventName);
                continue;
            }

            // Note: we currently assume that all events are compatible with
            // EventHandler. This method could do with more error checks...

            MethodInfo raiseMethod = sourceType.GetMethod("On"+sourceEvent.Name, 
                                                          BindingFlags.Instance | 
                                                          BindingFlags.Public | 
                                                          BindingFlags.NonPublic);
            if (raiseMethod == null)
            {
                Console.WriteLine("Can t find {0}.On{1}", sourceType.Name, sourceEvent.Name);
                continue;
            }
            EventInfo targetEvent = targetType.GetEvent(sourceEvent.Name);
            if (targetEvent == null)
            {
                Console.WriteLine("Can t find {0}.{1}", targetType.Name, sourceEvent.Name);
                continue;
            }
            MethodAndSource methodAndSource = new MethodAndSource(raiseMethod, source);
            Delegate handler = Delegate.CreateDelegate(sourceEvent.EventHandlerType,
                                                       methodAndSource,
                                                       invoker);

            targetEvent.AddEventHandler(target, handler);
        }
    }

    private static EventHandler Log(TextBox output, string text)
    {
        return (sender, args) => output.Text += text + "
";
    }

    private class MethodAndSource
    {
        private readonly MethodInfo method;
        private readonly object source;

        internal MethodAndSource(MethodInfo method, object source)
        {
            this.method = method;
            this.source = source;
        }

        public void Invoke(object sender, EventArgs args)
        {
            method.Invoke(source, new object[] { args });
        }
    }
}

我使用@nobugz的解决方案进行了一些挖掘，并提出了这个泛型版本，可以用于大多数通用对象。

我发现的是，对于自动事件，实际上编译时会使用同名的后备委托字段：

这里是关于从更简单的对象中“窃取”事件处理程序的一个例子：

class Program
{
    static void Main(string[] args)
    {
        var d = new Dummy();
        var d2 = new Dummy();

        // Use anonymous methods without saving any references
        d.MyEvents += (sender, e) => { Console.WriteLine("One!"); };
        d.MyEvents += (sender, e) => { Console.WriteLine("Two!"); };

        // Find the backing field and get its value
        var theType = d.GetType();
        var bindingFlags = BindingFlags.NonPublic | BindingFlags.Instance;

        var backingField = theType.GetField("MyEvents", bindingFlags);
        var backingDelegate = backingField.GetValue(d) as Delegate;

        var handlers = backingDelegate.GetInvocationList();

        // Bind the handlers to the second instance
        foreach (var handler in handlers)
            d2.MyEvents += handler as EventHandler;

        // See if the handlers are fired
        d2.DoRaiseEvent();

        Console.ReadKey();
    }
}

class Dummy
{
    public event EventHandler MyEvents;

    public void DoRaiseEvent() { MyEvents(this, new EventArgs()); }
}

认为这可能对一些人有用。

但要注意的是，Windows Forms 组件中的事件连接方式有所不同。它们被优化以使多个事件不会占用许多内存来保持为空。因此需要进行更多探索，但 @nobugz 已经做过了 :-)

这篇关于组合委托的文章《委托和事件》可能有助于澄清很多问题。

你可以针对你的按钮和图像框使用一个共同的事件处理程序（根据早期答案中的注释），然后在运行时使用发送方对象来确定如何处理事件。