C# linq query with groupby, having and where.

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Hi,

How to write Linq Query for below SQL Query.

Select Count(ul.OriginId),ul.OriginId from UserLink ul
Where ul.OriginId is not null
group by ul.OriginId
having count(ul.OriginId)>1


Select ul.UserId from UserLink ul where ul.OriginId=123

Finally I want to return UserId group by OriginId but here I have written in two separate queries. 
Can we write above sql queries in single Linq query? please help me how to write  linq query in C#.

Thanks,
jayaram

What I have tried:

I am not able to use having in Linq.

Posted 3-Apr-19 6:57am

Hi,jayaram

Updated 16-Apr-19 9:22am

v2

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[no name] 3-Apr-19 13:22pm

How would you like that coded? Console app? Windows Forms? WPF? UWP? Xamarin? Mobile? Tablet? PC?

What should we call this program?

Would you like a database with that? SQL Server? Oracle? MySql?

What about an ORM?

haseebshah 4-Apr-19 4:12am

Can you share table sample?

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Maciej Los · Answer 1 · 2019-04-16T09:22:00

Depending on what you're trying to achieve...

Try:

C#

var data = context.UserLink
    .GroupBy(x=>x.OriginId)
    .Where(grp=>grp.Key==123 && grp.Count()>1)
    .SelectMany(grp=>new
        {
             OriginId = grp.Key,
             UserId = grp.Select(u=> u.UserId)
             CountOfOriginId = grp.Count(),
         })
    .ToList();

Finally, i'd suggest to:
1) dowload 101 Linq samples[^]
2) download LinqPad[^]