c#如何获得附加事件?
我坐在我的电脑前,想知道如何获得所有添加的事件。我刚刚读了一些文章,包括为了更好地理解事件,我想我现在明白了主要的意思。但我仍然不知道如何获取在触发事件时执行的方法/委托列表。事实上,在我的例子中,如果我知道是否有任何方法/委托被分配给某个事件就足够了。 例如:我正在使用c#如何获得附加事件?,c#,events,delegates,C#,Events,Delegates,我坐在我的电脑前,想知道如何获得所有添加的事件。我刚刚读了一些文章,包括为了更好地理解事件,我想我现在明白了主要的意思。但我仍然不知道如何获取在触发事件时执行的方法/委托列表。事实上,在我的例子中,如果我知道是否有任何方法/委托被分配给某个事件就足够了。 例如:我正在使用Gma.UserActivityMonitor(用于键盘/鼠标挂钩) 现在我想知道事件HookManager.KeyUp事件是否不是null。 如果为空,则将添加一个委托。就我而言,这个\/ HookManager.KeyUp
Gma.UserActivityMonitor
(用于键盘/鼠标挂钩)
现在我想知道事件HookManager.KeyUp
事件是否不是null。
如果为空,则将添加一个委托。就我而言,这个\/
HookManager.KeyUp += new KeyEventHandler(HookManager_KeyUp);
编辑
示例代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using Gma.UserActivityMonitor;
namespace EventTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
HookManager.KeyUp += new KeyEventHandler(HookManager_KeyUp);
Delegate[] a = GetEventSubscribers(button1, "Click");
label1.Text = a[0].Method.ToString();
}
void HookManager_KeyUp(object sender, KeyEventArgs e)
{
/* Do something*/
}
bool NoEventAttached()
{
return false;
}
public static Delegate[] GetEventSubscribers(object target, string eventName)
{
Type t = target.GetType();
var eventInfo = t.GetEvent(eventName, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
do
{
FieldInfo[] fia = t.GetFields(
BindingFlags.Static |
BindingFlags.Instance |
BindingFlags.NonPublic);
foreach (FieldInfo fi in fia)
{
if (fi.Name == eventName)
{
Delegate d = fi.GetValue(target) as Delegate;
if (d != null)
return d.GetInvocationList();
}
else if (fi.FieldType == typeof(EventHandlerList))
{
----> var obj = fi.GetValue(target) as EventHandlerList;
var eventHandlerFieldInfo = obj.GetType().GetField("head", BindingFlags.Instance | BindingFlags.NonPublic);
do
{
var listEntry = eventHandlerFieldInfo.GetValue(obj);
var handler = listEntry.GetType().GetField("handler", BindingFlags.Instance | BindingFlags.NonPublic);
if (handler != null)
{
var subD = handler.GetValue(listEntry) as Delegate;
if (subD.GetType() != eventInfo.EventHandlerType)
{
eventHandlerFieldInfo = listEntry.GetType().GetField("next", BindingFlags.Instance | BindingFlags.NonPublic);
obj = listEntry as EventHandlerList; <-----------
continue;
}
if (subD != null)
{
return subD.GetInvocationList();
}
}
}
while (eventHandlerFieldInfo != null);
}
}
t = t.BaseType;
} while (t != null);
return new Delegate[] { };
}
private void button1_Click(object sender, EventArgs e)
{
}
private void button1_MouseClick(object sender, MouseEventArgs e)
{
}
}
}
使用系统;
使用System.Collections.Generic;
使用系统组件模型;
使用系统数据;
使用系统图;
使用System.Linq;
使用系统文本;
使用System.Windows.Forms;
运用系统反思;
使用Gma.UserActivityMonitor;
命名空间事件测试
{
公共部分类Form1:Form
{
公共表格1()
{
初始化组件();
HookManager.KeyUp+=新的KeyEventHandler(HookManager\u KeyUp);
委托[]a=GetEventSubscribers(按钮1,“单击”);
label1.Text=a[0]。方法.ToString();
}
void HookManager\u KeyUp(对象发送方,KeyEventArgs e)
{
/*做点什么
}
bool NoEventAttached()
{
返回false;
}
公共静态委托[]GetEventSubscribers(对象目标,字符串eventName)
{
类型t=target.GetType();
var eventInfo=t.GetEvent(eventName,BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
做
{
FieldInfo[]fia=t.GetFields(
BindingFlags.Static|
BindingFlags.Instance|
BindingFlags(非公开);
foreach(fia中的FieldInfo fi)
{
如果(fi.Name==eventName)
{
委托d=fi.GetValue(目标)作为委托;
如果(d!=null)
返回d.GetInvocationList();
}
else if(fi.FieldType==typeof(EventHandlerList))
{
---->var obj=fi.GetValue(目标)作为EventHandlerList;
var eventHandlerFieldInfo=obj.GetType().GetField(“head”,BindingFlags.Instance | BindingFlags.NonPublic);
做
{
var listEntry=eventHandlerFieldInfo.GetValue(obj);
var handler=listEntry.GetType().GetField(“handler”,BindingFlags.Instance | BindingFlags.NonPublic);
if(处理程序!=null)
{
var subD=handler.GetValue(listEntry)作为委托;
if(subD.GetType()!=eventInfo.EventHandlerType)
{
eventHandlerFieldInfo=listEntry.GetType().GetField(“下一步”,BindingFlags.Instance | BindingFlags.NonPublic);
obj=listEntry as EventHandlerList;我相信只要将HookManager.KeyUp与null进行比较就可以得到答案
但除此之外,除非自上次我调查以来情况有所改变(很可能)获取与事件关联的委托的实际列表相当困难。但是如果该值为null,则表明没有委托与事件关联。请注意此控制台应用程序,特别是调用GetInvocationList()的行
。该方法返回附加的代理列表。每个代理
都有一个方法
属性。每个方法
属性都有一个名称
委托人为您所有
委托不属于您
好吧,这有点混乱,但它得到了您想要的答案。即使内部实现使用了EventHandlerList
(这有点常见),但是我不能保证它绝对适用于所有场景,因为可能有很多不同的内部表示
但是,希望这对您有用。正如您在示例中看到的,我使用BackgroundWorker
类作为示例类,用于获取我不拥有的特定事件的调用列表
using System;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
internal class Program
{
private static void Main(string[] args)
{
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += new DoWorkEventHandler(worker_DoWork);
worker.DoWork += new DoWorkEventHandler(worker_DoWork2);
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
Console.WriteLine(string.Join(" | ", GetEventSubscribers(worker, "DoWork").Select(d => d.Method.Name).ToArray()));
}
static void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
throw new NotImplementedException();
}
static void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
throw new NotImplementedException();
}
static void worker_DoWork2(object sender, DoWorkEventArgs e)
{
throw new NotImplementedException();
}
static void worker_DoWork(object sender, DoWorkEventArgs e)
{
throw new System.NotImplementedException();
}
public static Delegate[] GetEventSubscribers(object target, string eventName)
{
Type t = target.GetType();
var eventInfo = t.GetEvent(eventName, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
do
{
FieldInfo[] fia = t.GetFields(
BindingFlags.Static |
BindingFlags.Instance |
BindingFlags.NonPublic);
foreach (FieldInfo fi in fia)
{
if (fi.Name == eventName)
{
Delegate d = fi.GetValue(target) as Delegate;
if (d != null)
return d.GetInvocationList();
}
else if (fi.FieldType == typeof(EventHandlerList))
{
dynamic obj = fi.GetValue(target) as EventHandlerList;
var eventHandlerFieldInfo = obj.GetType().GetField("head", BindingFlags.Instance | BindingFlags.NonPublic);
do
{
var listEntry = eventHandlerFieldInfo.GetValue(obj);
var handler = listEntry.GetType().GetField("handler", BindingFlags.Instance | BindingFlags.NonPublic);
if (handler != null)
{
var subD = handler.GetValue(listEntry) as Delegate;
if (subD.GetType() != eventInfo.EventHandlerType)
{
eventHandlerFieldInfo = listEntry.GetType().GetField("next", BindingFlags.Instance | BindingFlags.NonPublic);
obj = listEntry;
continue;
}
if (subD != null)
{
return subD.GetInvocationList();
}
}
}
while (eventHandlerFieldInfo != null);
}
}
t = t.BaseType;
} while (t != null);
return new Delegate[] { };
}
}
最后,虽然我对代码做了一些相当大的修改,但我必须给出一些帮助我开始这项工作。仅供参考,我添加了一个示例,演示如何获取事件的调用列表。这似乎是我正在寻找的^^^让我们看看它是否有效:PHmm我不知道如何使用静态事件oO我必须编辑外部dll,我的意思是我必须将其添加到实现该事件的类中吗?@lorenzalbert:你不应该这样做,这是一个公共虚拟
方法。嗯,也许你可以在我的编辑中帮助我使用给定的示例代码。除了使用getInvocationList
访问委托列表之外,我什么都懂。我的意思是你添加了event CheckInvocationList如果我这样做,我可以访问代理,但我不知道如何将所有内容关联起来以使其正常工作。编辑您的问题,并在此时发布您拥有的代码(调用GetInvocationList),我将尝试提供帮助。
using System;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
internal class Program
{
private static void Main(string[] args)
{
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += new DoWorkEventHandler(worker_DoWork);
worker.DoWork += new DoWorkEventHandler(worker_DoWork2);
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
Console.WriteLine(string.Join(" | ", GetEventSubscribers(worker, "DoWork").Select(d => d.Method.Name).ToArray()));
}
static void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
throw new NotImplementedException();
}
static void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
throw new NotImplementedException();
}
static void worker_DoWork2(object sender, DoWorkEventArgs e)
{
throw new NotImplementedException();
}
static void worker_DoWork(object sender, DoWorkEventArgs e)
{
throw new System.NotImplementedException();
}
public static Delegate[] GetEventSubscribers(object target, string eventName)
{
Type t = target.GetType();
var eventInfo = t.GetEvent(eventName, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
do
{
FieldInfo[] fia = t.GetFields(
BindingFlags.Static |
BindingFlags.Instance |
BindingFlags.NonPublic);
foreach (FieldInfo fi in fia)
{
if (fi.Name == eventName)
{
Delegate d = fi.GetValue(target) as Delegate;
if (d != null)
return d.GetInvocationList();
}
else if (fi.FieldType == typeof(EventHandlerList))
{
dynamic obj = fi.GetValue(target) as EventHandlerList;
var eventHandlerFieldInfo = obj.GetType().GetField("head", BindingFlags.Instance | BindingFlags.NonPublic);
do
{
var listEntry = eventHandlerFieldInfo.GetValue(obj);
var handler = listEntry.GetType().GetField("handler", BindingFlags.Instance | BindingFlags.NonPublic);
if (handler != null)
{
var subD = handler.GetValue(listEntry) as Delegate;
if (subD.GetType() != eventInfo.EventHandlerType)
{
eventHandlerFieldInfo = listEntry.GetType().GetField("next", BindingFlags.Instance | BindingFlags.NonPublic);
obj = listEntry;
continue;
}
if (subD != null)
{
return subD.GetInvocationList();
}
}
}
while (eventHandlerFieldInfo != null);
}
}
t = t.BaseType;
} while (t != null);
return new Delegate[] { };
}
}