EFCore:多线程中使用仓储方法,报错A second operation was started on this context instance before a previous operat
报错信息:上下文实例在销毁后又被第二次使用System.InvalidOperationException:Asecondoperationwasstartedonthiscontextinstancebeforeapreviousoperationcompleted.Thisisusuallycausedbydifferentthreadsconcurrentlyusingthesameinst