这个问题来自论坛,原文为如何判断事件已经被注册过?
用反射取出事件绑定的委托实例,然后用GetInvocationList就可以得到所有注册的方法了。
代码
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Reflection; namespace WindowsApplication19 { public partial class Form1 : Form { public Form1() { InitializeComponent(); this.Load+=new EventHandler(Form1_Load1); this.Load+=new EventHandler(Form1_Load2); PropertyInfo propertyInfo = (typeof(Form)).GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic); EventHandlerList eventHandlerList = (EventHandlerList)propertyInfo.GetValue(this, null); FieldInfo fieldInfo = (typeof(Form)).GetField("EVENT_LOAD", BindingFlags.Static | BindingFlags.NonPublic); Delegate d = eventHandlerList[fieldInfo.GetValue(null)]; if (d != null) { foreach (Delegate de in d.GetInvocationList()) Console.WriteLine(de.Method.Name); } } private void Form1_Load1(object sender, EventArgs e) { //什么也不干 } private void Form1_Load2(object sender, EventArgs e) { //什么也不干 } } }