public void AddParticipant(EventParticipant eventParticipant) { if (EventParticipants.Contains(eventParticipant)) { throw new ApplicationException($"添加错误:参与者已存在!"); } EventParticipants.Add(eventParticipant); }
public void RemoveParticipant(EventParticipant eventParticipant) { EventParticipants.Remove(eventParticipant); }