问题描述

利用反射来判断按钮是否添加了某个事件中的疑问

在网上查找资料中时候看到下面的代码

 static void Main(string[] args)
        {
            System.Windows.Forms.Button btn = new System.Windows.Forms.Button();
            btn.Click += new EventHandler(btn_Click);
            btn.Click += new EventHandler(btn_Click2);
            btn.Click += new EventHandler(btn_Click3);
            PropertyInfo pi = btn.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
            EventHandlerList ehl = (EventHandlerList)pi.GetValue(btn, null);
            FieldInfo fieldInfo = (typeof(System.Windows.Forms.Control)).GetField("EventClick", BindingFlags.Static | BindingFlags.NonPublic);
            Delegate d = ehl[fieldInfo.GetValue(null)];
            foreach (Delegate del in d.GetInvocationList())
                Console.WriteLine(del.Method.Name);
        }

        static void btn_Click(object sender, EventArgs e)
        {
            Console.WriteLine("Click1");
        }

        static void btn_Click2(object sender, EventArgs e)
        {
            Console.WriteLine("Click2");
        }

        static void btn_Click3(object sender, EventArgs e)
        {
            Console.WriteLine("Click3");
        }

问题来了：
PropertyInfo pi = btn.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
这一句的意思应该是获取属性名为“Event”的属性的信息，但是找了半天，发现button中没有名称为"Event"的属性啊，求大神指点

解决方案

Events是在Control基类中定义的。Button继承自Control