chenludaniel的专栏

1、查询语句如下 SELECT UserID,MAX(CreatedTime) CreatedTime FROM T_UserHistory WHERE UserID IN ('123456') GROUP BY UserID 2、转lambda后 var userIDs = new[] {'123456'}; var result = UserHis .Where(u=> userIDs.Contains(u.UserID)) .GroupBy(x => x.UserID) .S