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QuestionIs there anything that Python or Java can do for windows GUI applications while C# can't ? Pin
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QuestionLinq TO SQL DistinctBy Question Pin
Kevin Marois23-Jun-22 18:16
professionalKevin Marois23-Jun-22 18:16 
I hope this is clear. If not, I can explain further.

I have a table that looks like this

I will be running this Linq to SQL query repeatedly
var maxRev = 2;
var jobSequenceSheets = (from jss in dc.JobSequenceSheets
                            where jss.JobId == jobId &&
                                jss.RevisionNumber == maxRev
                            select jss).OrderBy(x => x.Plan)
                                       .ThenBy(x => x.Elevation)
                                       .DistinctBy(c => new { c.Plan, c.Elevation})
                                       .ToList();
So, of you look at the image, given RevisionNumber 2, I should get back only two records with Plan & Elevations of 1A and 2A. There are two rows for 2A because of the Lot. I don't care about the lot.

All I care about for a new feature I'm working on is that I get back a distinct set of Plan/Elevations with the SAME ID'S EACH TIME IT'S RUN. Since there are two rows for 2A, given this query, I should get back only 2 rows (not 3). Can I expect to get back the same ID's each time?

Does DistinctBy use the FIRST matching row it finds? I would expect this query to give me back rows 22607 and 22608 each run.

Thanks
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Everything makes sense in someone's mind.
Ya can't fix stupid.

AnswerRe: Linq TO SQL DistinctBy Question Pin
OriginalGriff23-Jun-22 19:49
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QuestionDrawing with c# Pin
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