标签：group class new sum div key span rds records
var records = studyRecords.GroupBy(x => x.StudyTime.Date).Select(y => new { date = y.Key, seconds = y.Sum(x => x.StudySeconds) });
标签：group class new sum div key span rds records
原文地址：https://www.cnblogs.com/dayang12525/p/13973319.html
