question

MarkusFreitag-0088 avatar image
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MarkusFreitag-0088 asked ·

LinQ, GroupBy, C#

Hello,
I have a Master Detail relationship.

Master 1:n Detail
1:n Detail (List)

Via LinQ I would like to group it.
That works too. But I can't reach the ResultView. See the green marker.
What should the query be called?

Thanks in advance for tipps and samples.

The code

    var qryPanelIndex = CurrentPanel.MainList[0].ListDetailBoards.GroupBy(info => info.PanelIndex)
                     .Select(group => new
                     {
                         PanelIndex = group.Key,
                         CountOccurrences = group.Count()
                     })
                     .OrderBy(x => x.PanelIndex).ToList();
    
             var qryPanelIndex2 = CurrentPanel.MainList[0].ListDetailBoards.GroupBy(info => info.PanelIndex).ToList();
    
             foreach(var item in qryPanelIndex2)
             {




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1 Answer

DanielZhang-MSFT avatar image
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DanielZhang-MSFT answered ·

Hi Markus Freitag,
>>I can't reach the ResultView
According to my understanding, do you want to reach the value of ListPosition in resultView of qryPanelIndex.
If so, you can add this line in the select statement.

 .Select(group => new
                      {
                          PanelIndex = group.Key,
                          CountOccurrences = group.Count(),
                           ListPosition=group.ToArray()
                      })

If not, please explain in detail.
Best Regards,
Daniel Zhang

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MarkusFreitag-0088 avatar image MarkusFreitag-0088 ·

That is it, works well! Thanks a lot for your help.

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