C#中删除控件的事件的方法类

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方法一:

/// <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.

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);         } }

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