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QuestionC# voice communication between 2 local pcs Pin
Getyourwings UK28-Jun-22 10:07
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QuestionIs there anything that Python or Java can do for windows GUI applications while C# can't ? Pin
Code4Ever24-Jun-22 2:33
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AnswerRe: Is there anything that Python or Java can do for windows GUI applications while C# can't ? Pin
Craig Robbins24-Jun-22 6:33
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AnswerRe: Is there anything that Python or Java can do for windows GUI applications while C# can't ? Pin
Richard MacCutchan24-Jun-22 22:38
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QuestionLinq TO SQL DistinctBy Question Pin
Kevin Marois23-Jun-22 18:16
professionalKevin Marois23-Jun-22 18:16 
AnswerRe: Linq TO SQL DistinctBy Question Pin
OriginalGriff23-Jun-22 19:49
mveOriginalGriff23-Jun-22 19:49 
GeneralRe: Linq TO SQL DistinctBy Question Pin
Richard Deeming23-Jun-22 22:36
mveRichard Deeming23-Jun-22 22:36 
AnswerRe: Linq TO SQL DistinctBy Question Pin
Richard Deeming23-Jun-22 22:43
mveRichard Deeming23-Jun-22 22:43 
It depends.

Are you using the DistinctBy method added in .NET 6, or a different implementation?

And does the ORM you're using translated DistinctBy to SQL, or does it evaluate it on the client?

If it evaluates it on the client, and you're using the .NET 6 method or something equivalent, then technically it will return the first item it encounters within each group.

However, this is an implementation detail, and you cannot rely on it. And since you don't order by the ID, you can't guarantee that the database will return the records in any ID-related order.

If you always want the lowest ID, then you need to be explicit:
C#
var jobSequenceSheets = dc.JobSequenceSheets
    .Where(jss => jss.JobId == jobId)
    .Where(jss => jss.RevisionNumber == maxRev)
    .GroupBy(jss => new { jss.Plan, jss.Elevation }, (_, items) => items.OrderBy(jss => jss.ID).First())
    .OrderBy(jss => jss.Plan).ThenBy(jss => jss.Elevation)
    .ToList();

NB: Depending on your ORM, you might need to stick an .AsEnumerable() between the second .Where(...) and the .GroupBy(...) to force client evaluation of the grouping.



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QuestionDrawing with c# Pin
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trønderen24-Jun-22 17:02
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QuestionSimple Paint app in winforms Pin
Aafaan_Jii20-Jun-22 23:19
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OriginalGriff20-Jun-22 23:40
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