Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
253 views
in Technique[技术] by (71.8m points)

c# - Field concatenation based on group in LINQ

I want concate a times field based on grouping of Userid and dates field using LINQ . i am using VS2010 C#(WPF).

i have a collection in below format.

enter image description here

and want result like

enter image description here

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You want to GroupBy the UserId, Date and presumably Deptname:

_context.Log.GroupBy(l => new { l.UserId, l.dates.Date, l.Deptname })
            .Select(g => new { g.Key.UserId, g.Key.Date, g.Key.Deptname, Log = string.Join(",", g.Select(i => i.times)) });

Should select the first UserId, Date and Deptname. Then join the log times together. Haven't checked this but seems like it should work.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...