问题描述

link中如何判断一个事件里面有几个方法？如何选择性调用？

link中如何判断一个事件里面有几个方法？如何选择性调用？

解决方案

 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            button1.Click += button1_Click_1;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("button1_0");
        }
        private void button1_Click_1(object sender, EventArgs e)
        {
            MessageBox.Show("button1_1");
        }
        public static Delegate[] GetObjectEventList(object p_Object, string p_EventName, Type p_EventType)
        {
            PropertyInfo _PropertyInfo = p_Object.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
            if (_PropertyInfo != null)
            {
                object _EventList = _PropertyInfo.GetValue(p_Object, null);
                if (_EventList != null && _EventList is EventHandlerList)
                {
                    EventHandlerList _List = (EventHandlerList)_EventList;
                    FieldInfo _FieldInfo = p_EventType.GetField(p_EventName, BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.IgnoreCase);
                    if (_FieldInfo == null) return null;
                    Delegate _ObjectDelegate = _List[_FieldInfo.GetValue(p_Object)];
                    if (_ObjectDelegate == null) return null;
                    return _ObjectDelegate.GetInvocationList();
                }
            }
            return null;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Delegate[] _List = GetObjectEventList(button1, "EventClick", typeof(Control));
            _List[1].Method.Invoke(this, new object[] { sender, e });
        }
    }
}

这段代码中点button2，只调用button1_Click_1