how to do addition in the Linq query

Question

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My query is like

C#

var query = dbContext.table1.join(dbcontext.table2,i=>i.table1.id,j=>j.table2.id,
     (i,j)=>new {
                   name = i.name,
                   hours = (new decimal?[]{ j.day1,j.day2,j.day3}.Sum()),
                   total = ???????
                 }).ToArray();

In my query In the hours field,I am getting the values of individual user working hours for three days. In the "total" field I want to display sum of all users "hours" values. can u tell me how to get the "total" value

Posted 15-Nov-12 19:35pm

charan1431

Updated 15-Nov-12 20:55pm

Herman<T>.Instance

v2

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Herman<T>.Instance 16-Nov-12 3:51am

hours.Sum() ?

what have you tried?

Rohit Shrivastava 16-Nov-12 18:08pm

I hope you understand that "(new decimal?[]{ j.day1,j.day2,j.day3}.Sum())" will not be executed on sql server rather it would be executed on .Net side. Total of all users you can get from the result set e.g.

query.Sum(item=> item.hours)

Greysontyrus 19-Nov-12 5:57am

That would be my answer You wouldn't want the total to appear for each anon type in the array anyway. It would be calculated each time if it were possible.
Rather than gathering the days into an array, just so you can use the linq Sum(), it would be better to simply add them (j.day1+j.day2+...+j.dayn) as that would be executed in the SQL.

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