How to write lambda (linq) expression for sql? - linq

Question

I have an Sql statement for which I need go generate corresponding Lambda Expression (Linq).
Here is the SQL
Declare #CurrentUserId as int
Declare #CurrentDate as datetime
Set #CurrentDate = GetDate()
Set #CurrentUserId = 1
Select C.conferenceId,C.specialtyId,C.name,C.city,S.abbr as statebbbr,CTRY.name as countryname,C.startdate,C.enddate
from Conferences C
Inner join (
Select distinct SpecialtyId
from UserContent
Where UserId = #CurrentUserId and DeletedFlag = 0
) DT on C.SpecialtyId = DT.SpecialtyId
Left outer join State S on C.StateId = S.StateId
Inner join Country CTRY on C.CountryId = CTRY.CountryId
Where C.DisplayStartDate <= #CurrentDate
and C.DisplayEndDate >= #CurrentDate
and C.DeletedFlag = 0
and C.Publish = 1
Order by C.startdate ASC
What wolud be the lambda(linq) expression for this?

Answer 1

Assume data context is in variable context
from c in context.conferences
join ctry in context.country on c.CountryId equals ctry.CountryId
join s1 in context.State on c.StateId equals s.StateId into s2
from s in s2.DefaultIfEmpty()
where
c.DisplayStartDate <= System.DateTime.Now
&& c.DisplayEndDate >= System.DateTime.Now
&& c.DeletedFlag == 0 // or false if represented as a bool
&& c.Publish == 1 // or true if represented as a bool
&& context.UserContent.Any(
x => x.SpecialityId == c.specialityId
&& x.UserId == currentUserId
&& x.DeletedFlag == 0
// or if represented as a bool "&& !x.DeletedFlag"
)
select new {
c.ConferenceId,
c.SpecialtyId,
c.name,
c.city,
stateabbr = s.abbr,
countryname = ctry.name,
c.startdate,
c.enddate
}