Question

I am not a pro on Linq but trying to understand. How to write this code (written in VB) in C#

Dim x = From p in db.YourClass _

Where p.fl1 = cn1 And p.f12 = cn2

Select _

sum1 = x.Sum(Function(y) y.fl1), _

sum2 = x.Sum(Function(y) y.fl2), _

sum3 = x.Sum(Function(y) y.fl3)

what i am trying to achieve is this,

select sum(fl1),sum(fl2),sum(fl3)

where fl1 =cn1 and fl2=cn2

The above sample found here

Answer 1

var x = from p in db.YourClass 
        where p.fl1 == cn1 && p.f12 == cn2
        select p;

  var sum1 = x.Sum(y=>y.fl1), 

  var sum2 = x.Sum(y=>y.fl2), 

  var sum3 = x.Sum(y=>y.fl3)

Edit: In one query I think this can work fast:

var x = (from p in db.YourClass 

        select new 
        {
         s1 = db.YourClass.Where(y=> y.fl1 == cn1 && y.f12 == cn2).Sum(y=>y.fl1),
         s2 = db.YourClass.Where(y=> y.fl1 == cn1 && y.f12 == cn2).Sum(y=>y.fl2),
         s3 = db.YourClass.Where(y=> y.fl1 == cn1 && y.f12 == cn2).Sum(y=>y.fl3)
        }).First();

 int sum1 = x.s1, sum2 = x.s2, sum3 = x.s3;