利用反射綁定事件處理常式 (C#)

傳統寫法：強類型情況下

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Customer c = new Customer();
            c.OnChange += new EventHandler(c_OnChange);
            c.Change();
            Console.Read();
        }
        static void c_OnChange(object sender, EventArgs e)
        {
            Console.WriteLine("事件被觸發了");
        }
    }
    class Customer
    {
        public event EventHandler OnChange;
        public void Change()
        {
            if (OnChange != null) OnChange(this, null);
        }
    }
}

值得了解的另一種寫法

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Customer c = new Customer();
            EventInfo evt = c.GetType().GetEvent("OnChange",
                BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public);
            evt.AddEventHandler(c, new EventHandler(c_OnChange));
            c.Change();
            Console.Read();
        }
        static void c_OnChange(object sender, EventArgs e)
        {
            Console.WriteLine("事件被觸發了");
        }
    }
    class Customer
    {
        public event EventHandler OnChange;
        public void Change()
        {
            if (OnChange != null) OnChange(this, null);
        }
    }
}