关于EF的 序列化类型为“XXX”的对象时检测到循环引用。

IQueryable<TopicInfo> topicInfos = _topicInfoService.GetPagedEntitesQueryable(pageSize, pageIndex,
wherelambda, t => t.TopicId, true);

            var newTopicInfos = topicInfos.Select(t => new
            {
                TopicId = t.TopicId,
                ParentId = t.ParentId,
                TopicName = t.TopicName,
                TopicDescription = t.TopicDescription,
                ImgUrl = t.ImgUrl,
                ModifyTime = t.ModifyTime
            });
            return Json(newTopicInfos);