反射方法获取事件的委托链上的函数

最新推荐文章于 2023-05-17 08:21:55 发布

转载最新推荐文章于 2023-05-17 08:21:55 发布 · 60 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/arxive/p/6932445.html

本文通过C#代码示例展示了如何使用反射获取并遍历控件的事件处理程序。通过对按钮点击事件和鼠标移动事件的处理，演示了事件委托的获取及事件处理方法的调用过程。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;


namespace TestDev
{
    class Program
    {
        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);
            btn.MouseMove += btn_MouseMove;
            btn.MouseMove += btn_MouseMove2;
            
            PropertyInfo pi = btn.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
            EventHandlerList ehl = (EventHandlerList)pi.GetValue(btn, null);//EventClick
            FieldInfo fieldInfo = (typeof(System.Windows.Forms.Control)).GetField("EventMouseMove", BindingFlags.Static | BindingFlags.NonPublic);
            Delegate d = ehl[fieldInfo.GetValue(null)];
            foreach (Delegate del in d.GetInvocationList())
                Console.WriteLine(del.Method.Name);
           

        }

        static void btn_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            throw new NotImplementedException();
        }

        static void btn_MouseMove2(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            throw new NotImplementedException();
        }

        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");
        }
        
    }
}