Join in linq having multiple condition with not equal condition

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C#

IQueryable<employee> emp = (from x in db.GetTable<employee>()
                                    join y in db.employesalaries on new (x.Id,Datetime.now.Month) equals (y.employe_id,y.paymentdate.Mont) into ps
                                    from salary in ps.DefaultIfEmpty();
                                    where x.branch_id == branchId && salary.payment_date.Month != DateTime.Now.Month
                                    select x);

I want to get all employees unpaid payment of current month .and also if its his first payment then defiantly record will not be in db.emloyesalaries . please help me out how can i use this with the help of linq.

What I have tried:

in this query . i always get records even when i pay the bill of current month . also if id is not in db.employesalaries .i can see employee .

Posted 4-Oct-16 21:59pm

vakaskhan

Updated 6-Oct-16 3:32am

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Ehsan Sajjad · Answer 1 · 2016-10-06T03:32:00

You need to to check if record in emplyeesalaries table month is smaller than previous month which can be checked like:

C#

int currentMonth = Datetime.Now.Month;
int previousMonth = Datetime.Now.AddMonths(-1).Month;
IQueryable<employee> emp = (from x in db.GetTable<employee>()
                            join y in db.employesalaries 
                            on new {x.Id,currentMonth} 
                            equals new {y.employe_id,y.paymentdate.Month} into ps
                            from salary in ps.DefaultIfEmpty();
                            // for first salary and current month salary not deposited
                            where salary ==null 
                            && x.branch_id == branchId 
                            select x);