dotnet一技巧

  //看看控件是否已经绑定某事件
        public static bool isBinded(Control control, string EventName, string EventHandlerTypeName)
        //, string eventName, Type controlType)
        {
            if (GetComponentEventDelegate(control, EventName, EventHandlerTypeName) == null) return false;
            else
                return GetComponentEventDelegate(control, EventName, EventHandlerTypeName).Length > 0;
        }

        private static Delegate[] GetComponentEventDelegate(Component component, string EventName,
                                                            string EventHandlerTypeName)
        {
            Type componentType = component.GetType();
            PropertyInfo eventsPropertyInfo =
                componentType.GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
            EventHandlerList eventHanlderList = eventsPropertyInfo.GetValue(component, null) as EventHandlerList;

            do
            {
                FieldInfo[] fieldInfoList =
                    componentType.GetFields(BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic);
                foreach (FieldInfo fieldInfo in fieldInfoList)
                {
                    object fieldValue = fieldInfo.GetValue(component);
                    if (fieldValue != null)
                    {
                        Type fieldType = fieldValue.GetType();
                        if (fieldType.Name == EventHandlerTypeName && (fieldValue as Delegate) != null)
                        {
                            return (fieldValue as Delegate).GetInvocationList();
                        }
                    }
                }
                componentType = componentType.BaseType;
            } while (componentType != null);

            return null;
        }