移除类型中的所有事件：

 /// <summary>
        /// 清除事件
        /// </summary>
        /// <param name="obj"></param>
        public static void RemoveAllEvent(object obj)
        {
            var newType = obj.GetType();
            foreach (var item in newType.GetEvents())
            {
                FieldInfo _Field = newType.GetField(item.Name, BindingFlags.Instance | BindingFlags.NonPublic);
                if (_Field != null)
                {
                    object _FieldValue = _Field.GetValue(obj);
                    if (_FieldValue != null && _FieldValue is Delegate)
                    {
                        Delegate _ObjectDelegate = (Delegate)_FieldValue;
                        Delegate[] invokeList = _ObjectDelegate.GetInvocationList();
                        if (invokeList != null)
                        {
                            foreach (Delegate del in invokeList)
                            {
                                item.RemoveEventHandler(obj, del);
                            }
                        }
                    }
                }
            }
        }