LinqtoSQL filter and order by syntax
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03-07-2019 - |
Question
My Techie Bretheren (and Sisteren, of course!),
I have a LinqToSql data model that has the following entities: data model http://danimal.acsysinteractive.com/images/advisor.jpg
I need to retrieve all advisors for a specific office, ordered by their sequence within the office. I've got the first part working with a join:
public static List<Advisor>GetOfficeEmployees(int OfficeID)
{
List<Advisor> lstAdvisors = null;
using (AdvisorDataModelDataContext _context = new AdvisorDataModelDataContext())
{
var advisors = from adv in _context.Advisors
join advisoroffice in _context.OfficeAdvisors
on adv.AdvisorId equals advisoroffice.AdvisorId
where advisoroffice.OfficeId == OfficeID
select adv;
lstAdvisors = advisors.ToList();
}
return lstAdvisors;
}
However, I can't seem to wrap my weary brain around the order by clause. Can anyone give some suggestions?
Solution
from adv in _context.Advisors
where adv.OfficeAdvisor.Any(off => off.OfficeId == officeID)
order adv by adv.OfficeAdvisor.First(off => off.OfficeId = officeID).Sequence
select adv;
OTHER TIPS
public static List<Advisor>GetOfficeEmployees(int OfficeID)
{
List<Advisor> lstAdvisors = null;
using (AdvisorDataModelDataContext _context = new AdvisorDataModelDataContext())
{
var advisors = from adv in _context.Advisors
join advisoroffice in _context.OfficeAdvisors
on adv.AdvisorId equals advisoroffice.AdvisorId
where advisoroffice.OfficeId == OfficeID
group adv by adv.OfficeId into g
order by g.Sequence
select g;
lstAdvisors = advisors.ToList();
}
return lstAdvisors;
}
Note: I am not able to currently test this on Visual Studio but should work.
You can add an order by clause like this:
var advisors = from adv in _context.Advisors
join advisoroffice in _context.OfficeAdvisors
on adv.AdvisorId equals advisoroffice.AdvisorId
where advisoroffice.OfficeId == OfficeID
orderby advisoroffice.Sequence // < -----
select adv;
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