public void AddCareList(EntityInfo info) { User enter_user = info.CustomData as User; if (enter_user == null) { return; } IList <EntityInfo> users = new List <EntityInfo>(); foreach (EntityInfo user_info in users) { if (user_info.GetId() == info.GetId()) { continue; } User user = user_info.CustomData as User; if (null == user) { continue; } user.AddCareMeUser(enter_user); enter_user.AddCareMeUser(user); } }