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void ClearEvent(Control pControl, string pEventName)
{
if (pControl== null) return;
if (string.IsNullOrEmpty(pEventName)) return;
BindingFlags mPropertyFlags = BindingFlags.Instance | BindingFlags.Public
| BindingFlags.Static | BindingFlags.NonPublic;//筛选
BindingFlags mFieldFlags = BindingFlags.Static | BindingFlags.NonPublic;
Type controlType = typeof(System.Windows.Forms.Control);
PropertyInfo propertyInfo = controlType.GetProperty("Events", mPropertyFlags);
EventHandlerList eventHandlerList = (EventHandlerList)propertyInfo.GetValue(pControl, null);//事件列表
FieldInfo fieldInfo = (typeof(Control)).GetField("Event" + pEventName, mFieldFlags);
Delegate d = eventHandlerList[fieldInfo.GetValue(pControl)];
if (d == null) return;
EventInfo eventInfo=controlType.GetEvent(pEventName);
foreach (Delegate dx in d.GetInvocationList())
eventInfo.RemoveEventHandler(pControl, dx);//移除已订阅的pEventName类型事件
}