高手们问个关于linq的问题 public List<NewClass> GetEndUser(long userID) { DataClassesDataContext context = new DataClassesDataContext(); List<NewClass> entity=( from a in context.holderusers join b in context.devicetypes on a.devicetype equals b.ID where a.userID == userID select new NewsClass(){a ,b.description }).ToList(); return entity; } 报找不到命名空间和类型NewClass,难道只有新建一个实体类才能够解决问题吗?