摘要: var records = studyRecords.GroupBy(x => x.StudyTime.Date).Select(y => new { date = y.Key, seconds = y.Sum(x => x.StudySeconds) }); 阿里云优惠活动 阅读全文
posted @ 2020-11-14 15:10 向萧 阅读(2524) 评论(0) 推荐(0) 编辑