C# 中删除控件的事件的方法类

方法一:

代码

        /// <summary>

        /// 删除指定控件的指定事件

        /// </summary>

        /// <param name="control"></param>

        /// <param name="eventname"></param>

        public void ClearEvent(System.Windows.Forms.Control control, string eventname)

        {

            if (control == null) return;

            if (string.IsNullOrEmpty(eventname)) return;

            BindingFlags mPropertyFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.Static | BindingFlags.NonPublic;

            BindingFlags mFieldFlags = BindingFlags.Static | BindingFlags.NonPublic;

            Type controlType = typeof(System.Windows.Forms.Control);

            PropertyInfo propertyInfo = controlType.GetProperty("Events", mPropertyFlags);

            EventHandlerList eventHandlerList = (EventHandlerList)propertyInfo.GetValue(control, null);

            FieldInfo fieldInfo = (typeof(System.Windows.Forms.Control)).GetField("Event" + eventname, mFieldFlags);

            Delegate d = eventHandlerList[fieldInfo.GetValue(control)];

            if (d == null) return;

            EventInfo eventInfo = controlType.GetEvent(eventname);

            foreach (Delegate dx in d.GetInvocationList())

                eventInfo.RemoveEventHandler(control, dx);

        }

调用:ClearEvent(button1,"Click");//就会清除button1对象的Click事件的所有挂接事件。

方法二,写一个操作类,记录添加的事件列表,删除时从事件列表中读取出来然后删除.

代码

class MyEventManager:IDisposable

    {

        EventHandlerList eventList = new EventHandlerList();

        Hashtable eventObjectList = new Hashtable();

        public void AddEvent(Control control, string eventname, EventHandler eventhandler)

        {

            string keystr = control.Name + eventname;

            if (!eventObjectList.Contains(keystr)) eventObjectList.Add(keystr, new object());

            object eventObject = eventObjectList[keystr];

            switch (eventname)

            {

                case "Click":

                    control.Click += eventhandler;

                    break;

                case "Enter":

                    control.Enter += eventhandler;

                    break;

                    //...

                    //这里可以添加更多的事件支持，这都是因为C# 不支持宏替换而采用的无奈之举

                    //当然用反射也可以，不过用反射就没必要用这种方法了。

            }

            eventList.AddHandler(eventObject, eventhandler);

        }

        public void DelEvent(Control control, string eventname)

        {

            string keystr = control.Name + eventname;

            object eventObject = eventObjectList[keystr];

            Delegate d = eventList[eventObject];

            if (d == null) return;

            foreach (Delegate dd in d.GetInvocationList())

            {

                switch (eventname)

                {

                    case "Click":

                        control.Click -= (EventHandler)dd;

                        break;

                    case "Enter":

                        control.Enter -= (EventHandler)dd;

                        break;

                    //...

                    //这里可以添加更多的事件支持，这都是因为C# 不支持宏替换而采用的无奈之举

                    //当然用反射也可以，不过用反射就没必要用这种方法了。

                }

            }

            eventList.RemoveHandler(eventObject, d);

            eventObjectList.Remove(eventObject);

        }

}