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);
}
}