2017年7月4日
确保事件只注册一次
摘要： https://stackoverflow.com/questions/2697247/how-to-determine-if-an-event-is-already-subscribed he event keyword was explicitly invented to prevent you 阅读全文
posted @ 2017-07-04 18:32 ChuckLu 阅读(305) 评论(0) 推荐(0)