取消事件所有委托方法

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

namespace ConsoleApplication3
{
class Program
{
static void Main(string[] args)
{
ProtocolEvent c = new ProtocolEvent();
c.OnChange += new ProtocolEvent.mydelegate(c_OnChange);
c.OnChange += new ProtocolEvent.mydelegate(c_OnChange2);

RemoveEvent<ProtocolEvent>(c, "OnChange");

c.OnChange += new ProtocolEvent.mydelegate(c_OnChange);

c.Change("ddd");
}

static void c_OnChange(string str)
{
Console.WriteLine(str);
}
static void c_OnChange2(string str)
{
Console.WriteLine(str);
}

static void RemoveEvent<T>(T c, string name)
{
Delegate[] invokeList = GetObjectEventList(c, name);

if (invokeList == null) return;

foreach (Delegate del in invokeList)
{
typeof(T).GetEvent(name).RemoveEventHandler(c, del);
}
}

/// <summary>
/// 说来很简单，GetType().GetField("事件名",BindingFlags.Instance | BindingFlags.NonPublic);
/// 然后调用GetValue就可以得到对应的委托了。既然有委托了。调用GetInvokeList就可以了。
public static Delegate[] GetObjectEventList(object p_Object, string p_EventName)
{
FieldInfo fi = p_Object.GetType().GetField("OnChange", BindingFlags.Instance | BindingFlags.NonPublic);
if (fi == null) return null;

Delegate del = fi.GetValue(p_Object) as Delegate;
if (del != null)
{
//执行方法
//foreach (var item in del.GetInvocationList())
//{
//    Console.WriteLine(item.Method.ToString());
//    item.Method.Invoke(null,new object[]{"str"});
//}
return del.GetInvocationList();
}
return null;
}
}

class ProtocolEvent
{
public delegate void mydelegate(string str);

public event mydelegate OnChange;

public void Change(string str)
{
if (OnChange != null)
{
OnChange(str);
}
}
}
}