C#如何使用反射获取事件的响应方法？

爱在今世 2014-11-06 04:41:50

如题，

Label li =new Label();

MouseDown += new MouseEventHandler(this.Down);

在另一个地方有个循环获取所有控件



foreach (Control c in shapeContainer1.Controls)

{

      .........

}

如何在这个foreach中获取指定的Control的指定响应方法的名称 “Down”呢？

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爱在今世 2014-11-07

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引用 7 楼 a463658998 的回复:

[quote=引用 5 楼 showyusy 的回复:] [quote=引用 2 楼 a463658998 的回复:]

public Form3()
        {
            InitializeComponent();

            button1.MouseClick += new MouseEventHandler(button1_MouseClick);
            
            foreach (Control c in this.Controls) 
            {
                if (c is Button) 
                {
                    Button btn = c as Button;
                    if(btn.Name == "button1")
                    {
                        Delegate[] _ControlDelegate = GetObjectEventList(button1, "EventMouseClick");
                        Delegate d = _ControlDelegate[0];
                        MethodInfo info = d.Method;
                        string str = info.Name;
                    }                    
                }
            }
        }

        private Delegate[] GetObjectEventList(Control p_Control, string p_EventName)
        {
            PropertyInfo _PropertyInfo = p_Control.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
            if (_PropertyInfo != null)
            {
                object _EventList = _PropertyInfo.GetValue(p_Control, null);
                if (_EventList != null && _EventList is EventHandlerList)
                {
                    EventHandlerList _List = (EventHandlerList)_EventList;
                    FieldInfo _FieldInfo = (typeof(Control)).GetField(p_EventName, BindingFlags.Static | BindingFlags.NonPublic);
                    if (_FieldInfo == null) return null;
                    Delegate _ObjectDelegate = _List[_FieldInfo.GetValue(p_Control)];
                    if (_ObjectDelegate == null) return null;
                    return _ObjectDelegate.GetInvocationList();
                }
            }
            return null;
        } 

        void button1_MouseClick(object sender, MouseEventArgs e)
        {
            throw new NotImplementedException();
        }

你这个代码的第一段我改了一下是如下

Delegate[] _ControlDelegate = GetObjectEventList(this.Controls[1], "EventMouseDown");
            Delegate d = _ControlDelegate[0];
            MethodInfo info = d.Method;
            string str = info.Name;

然后运行的时候_ControlDelegate这个值为空[/quote]你确定你的这个this.Controls[1]注册了MouseDown事件？[/quote] 好吧，我脑残了，我是再设计页面点击的事件，想着这个this.Controls[1]是覆盖窗体的，还以为就是这个注册了MouseDown事件，没想到刚刚一看才发现，原来是form注册的事件不是this.Controls[1]这个。。。。。。

hwangt0 2014-11-07

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引用 5 楼 showyusy 的回复:

[quote=引用 2 楼 a463658998 的回复:]

public Form3()
        {
            InitializeComponent();

            button1.MouseClick += new MouseEventHandler(button1_MouseClick);
            
            foreach (Control c in this.Controls) 
            {
                if (c is Button) 
                {
                    Button btn = c as Button;
                    if(btn.Name == "button1")
                    {
                        Delegate[] _ControlDelegate = GetObjectEventList(button1, "EventMouseClick");
                        Delegate d = _ControlDelegate[0];
                        MethodInfo info = d.Method;
                        string str = info.Name;
                    }                    
                }
            }
        }

        private Delegate[] GetObjectEventList(Control p_Control, string p_EventName)
        {
            PropertyInfo _PropertyInfo = p_Control.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
            if (_PropertyInfo != null)
            {
                object _EventList = _PropertyInfo.GetValue(p_Control, null);
                if (_EventList != null && _EventList is EventHandlerList)
                {
                    EventHandlerList _List = (EventHandlerList)_EventList;
                    FieldInfo _FieldInfo = (typeof(Control)).GetField(p_EventName, BindingFlags.Static | BindingFlags.NonPublic);
                    if (_FieldInfo == null) return null;
                    Delegate _ObjectDelegate = _List[_FieldInfo.GetValue(p_Control)];
                    if (_ObjectDelegate == null) return null;
                    return _ObjectDelegate.GetInvocationList();
                }
            }
            return null;
        } 

        void button1_MouseClick(object sender, MouseEventArgs e)
        {
            throw new NotImplementedException();
        }

你这个代码的第一段我改了一下是如下

Delegate[] _ControlDelegate = GetObjectEventList(this.Controls[1], "EventMouseDown");
            Delegate d = _ControlDelegate[0];
            MethodInfo info = d.Method;
            string str = info.Name;

然后运行的时候_ControlDelegate这个值为空[/quote]你确定你的这个this.Controls[1]注册了MouseDown事件？

爱在今世 2014-11-06

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引用 5 楼 showyusy 的回复:

[quote=引用 2 楼 a463658998 的回复:]

public Form3()
        {
            InitializeComponent();

            button1.MouseClick += new MouseEventHandler(button1_MouseClick);
            
            foreach (Control c in this.Controls) 
            {
                if (c is Button) 
                {
                    Button btn = c as Button;
                    if(btn.Name == "button1")
                    {
                        Delegate[] _ControlDelegate = GetObjectEventList(button1, "EventMouseClick");
                        Delegate d = _ControlDelegate[0];
                        MethodInfo info = d.Method;
                        string str = info.Name;
                    }                    
                }
            }
        }

        private Delegate[] GetObjectEventList(Control p_Control, string p_EventName)
        {
            PropertyInfo _PropertyInfo = p_Control.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
            if (_PropertyInfo != null)
            {
                object _EventList = _PropertyInfo.GetValue(p_Control, null);
                if (_EventList != null && _EventList is EventHandlerList)
                {
                    EventHandlerList _List = (EventHandlerList)_EventList;
                    FieldInfo _FieldInfo = (typeof(Control)).GetField(p_EventName, BindingFlags.Static | BindingFlags.NonPublic);
                    if (_FieldInfo == null) return null;
                    Delegate _ObjectDelegate = _List[_FieldInfo.GetValue(p_Control)];
                    if (_ObjectDelegate == null) return null;
                    return _ObjectDelegate.GetInvocationList();
                }
            }
            return null;
        } 

        void button1_MouseClick(object sender, MouseEventArgs e)
        {
            throw new NotImplementedException();
        }

你这个代码的第一段我改了一下是如下

Delegate[] _ControlDelegate = GetObjectEventList(this.Controls[1], "EventMouseDown");
            Delegate d = _ControlDelegate[0];
            MethodInfo info = d.Method;
            string str = info.Name;

然后运行的时候_ControlDelegate这个值为空[/quote] 其他的都很正常，但是Delegate _ObjectDelegate = _List[_FieldInfo.GetValue(p_Control)];运行到里的时候，右边的值为空

爱在今世 2014-11-06

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引用 2 楼 a463658998 的回复:

public Form3()
        {
            InitializeComponent();

            button1.MouseClick += new MouseEventHandler(button1_MouseClick);
            
            foreach (Control c in this.Controls) 
            {
                if (c is Button) 
                {
                    Button btn = c as Button;
                    if(btn.Name == "button1")
                    {
                        Delegate[] _ControlDelegate = GetObjectEventList(button1, "EventMouseClick");
                        Delegate d = _ControlDelegate[0];
                        MethodInfo info = d.Method;
                        string str = info.Name;
                    }                    
                }
            }
        }

        private Delegate[] GetObjectEventList(Control p_Control, string p_EventName)
        {
            PropertyInfo _PropertyInfo = p_Control.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
            if (_PropertyInfo != null)
            {
                object _EventList = _PropertyInfo.GetValue(p_Control, null);
                if (_EventList != null && _EventList is EventHandlerList)
                {
                    EventHandlerList _List = (EventHandlerList)_EventList;
                    FieldInfo _FieldInfo = (typeof(Control)).GetField(p_EventName, BindingFlags.Static | BindingFlags.NonPublic);
                    if (_FieldInfo == null) return null;
                    Delegate _ObjectDelegate = _List[_FieldInfo.GetValue(p_Control)];
                    if (_ObjectDelegate == null) return null;
                    return _ObjectDelegate.GetInvocationList();
                }
            }
            return null;
        } 

        void button1_MouseClick(object sender, MouseEventArgs e)
        {
            throw new NotImplementedException();
        }

你这个代码的第一段我改了一下是如下

Delegate[] _ControlDelegate = GetObjectEventList(this.Controls[1], "EventMouseDown");
            Delegate d = _ControlDelegate[0];
            MethodInfo info = d.Method;
            string str = info.Name;

然后运行的时候_ControlDelegate这个值为空

爱在今世 2014-11-06

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引用 1 楼 phommy 的回复:

MouseDown += Down; MessageBox.Show(getDelegateByControl(this, "EventMouseDown").Method.Name); //显示Down 其中的getDelegateByControl：

        Delegate getDelegateByControl(Control Control, string EventName)
        {
            var events =
                typeof(Control).GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(Control)
                    as EventHandlerList;

            var key = typeof(Control).GetField(EventName, BindingFlags.Static | BindingFlags.NonPublic);
            if (key == null)
            {
                throw new ArgumentException("提供的事件名不存在。", "EventName");
            }

            return events[key.GetValue(null)];
        }

你的代码中的typeof(Control).GetField(EventName, BindingFlags.Static | BindingFlags.NonPublic)这一句我改成了typeof(Control).GetFields(BindingFlags.Static | BindingFlags.NonPublic)竟然发现，这个集合里面没有一个元素

hwangt0 2014-11-06

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上面代码中string str = info.Name; str的值为button1_MouseClick

hwangt0 2014-11-06

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public Form3()
        {
            InitializeComponent();

            button1.MouseClick += new MouseEventHandler(button1_MouseClick);
            
            foreach (Control c in this.Controls) 
            {
                if (c is Button) 
                {
                    Button btn = c as Button;
                    if(btn.Name == "button1")
                    {
                        Delegate[] _ControlDelegate = GetObjectEventList(button1, "EventMouseClick");
                        Delegate d = _ControlDelegate[0];
                        MethodInfo info = d.Method;
                        string str = info.Name;
                    }                    
                }
            }
        }

        private Delegate[] GetObjectEventList(Control p_Control, string p_EventName)
        {
            PropertyInfo _PropertyInfo = p_Control.GetType().GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
            if (_PropertyInfo != null)
            {
                object _EventList = _PropertyInfo.GetValue(p_Control, null);
                if (_EventList != null && _EventList is EventHandlerList)
                {
                    EventHandlerList _List = (EventHandlerList)_EventList;
                    FieldInfo _FieldInfo = (typeof(Control)).GetField(p_EventName, BindingFlags.Static | BindingFlags.NonPublic);
                    if (_FieldInfo == null) return null;
                    Delegate _ObjectDelegate = _List[_FieldInfo.GetValue(p_Control)];
                    if (_ObjectDelegate == null) return null;
                    return _ObjectDelegate.GetInvocationList();
                }
            }
            return null;
        } 

        void button1_MouseClick(object sender, MouseEventArgs e)
        {
            throw new NotImplementedException();
        }

phommy 2014-11-06

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MouseDown += Down; MessageBox.Show(getDelegateByControl(this, "EventMouseDown").Method.Name); //显示Down 其中的getDelegateByControl：

        Delegate getDelegateByControl(Control Control, string EventName)
        {
            var events =
                typeof(Control).GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(Control)
                    as EventHandlerList;

            var key = typeof(Control).GetField(EventName, BindingFlags.Static | BindingFlags.NonPublic);
            if (key == null)
            {
                throw new ArgumentException("提供的事件名不存在。", "EventName");
            }

            return events[key.GetValue(null)];
        }