LINQ query to get COUNT

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Consider following table structure
PartID PartInstanceID PartInstanceName Used
1 1 A Y
1 2 B N
1 3 C N
1 4 D N
2 5 E N
2 6 F N
3 7 G Y
4 8 H N
5 9 I N
5 10 J N

Can anyone tell me a query in LINQ to get following output?

To get Unused instances:
PartID InstanceCount
1 3
2 2
3 0
4 1
5 2

To get used instances:
PartID InstanceCount
1 1
2 0
3 1
4 0
5 0

Please let me know.

Thanks in advance.

Posted 14-Oct-11 1:08am

Amol_27101982, India

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Simon Bang Terkildsen · Accepted Answer · 2011-10-14T01:15:00

Solution 1

C#

var query = from p in myTable
            where p.Used = "N"
            group p by p.PartID into gp
            select new
                   {
                       PartID = gp.PartID,
                       InstanceCount = gp.Count(),
                   }

I'll leave it to you to alter the above to get the result for unused parts.

Posted 14-Oct-11 1:15am

Simon Bang Terkildsen

Updated 14-Oct-11 1:16am

v2

Comments

Amol_27101982, India 14-Oct-11 7:54am

It works dude :)

Thanks a lot.

Simon Bang Terkildsen 14-Oct-11 8:26am

My pleasure

sowjanya bantupalli 4-Sep-15 2:51am

sorry to say this i didnt get result through this query pls check my query once
var x = from u in db.Appointment.AsEnumerable () where u.VisitingDepartmentName!=null group u by u.VisitingDepartmentName
into g select new { VisitingDepartmentName = g.Key ,
TotalNoofVisitors = g.Count(),
//TotalNoofVisitors=g==null ? 0:g.Count(),
Records = g
};
inresult count is zero it gives like this

Md. Rashim Uddin · Accepted Answer · 2011-10-14T01:54:00

Solution 2

This is very simple. Have a look with this

C#

var counts = products.GroupBy(l => l.PartID).Select(lg => new { PartID = lg.Key, InstanceCount = lg.Count() });

Here products is a list object. you might think that the collection of your data in a List.

Posted 14-Oct-11 1:54am

Md. Rashim Uddin

Comments

Amol_27101982, India 14-Oct-11 7:56am

Thanks.