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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
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

AnswerRe: Linq TO SQL DistinctBy Question Pin
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QuestionDrawing with c# Pin
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