Question

I am trying to convert the below mentioned SQL query to LINQ query

Qry = "select Announcement, StartDate, Enddate,Annkey from
Announcements ";   Qry = Qry & " where Startdate <= #" & Today & "# " 
Qry = Qry & " and Enddate >= #" & Today & "# "  Qry = Qry + " order by
StartDate, Enddate";

What I have made so far –

public bool Selectdatafromannouncements()
        {


            List<Announcement> lstAnnounce = new List<Announcement>(
                from l in objVaccinationContext.Announcements
                where
                    l.StartDate.Value < DateTime.Today
                    && l.EndDate.Value < DateTime.Today
                orderby l.StartDate, l.EndDate
                select new (l.Announcement1, l.StartDate, l.EndDate, l.AnnouncementID)
                );


            return true;
        }

Getting an error near select new ( as type expected please help me out i am a beginner with LINQ

Answer 1

You don’t need a constructor here, for creating the list.
The curly braces are used for creating anonymous objects, so instead of declaring lstAnnounce of List<Announcement> type, better use the var keyword.

So you can have this:

var query = from l in objVaccinationContext.Announcements
                  where
                    l.StartDate.Value < DateTime.Today
                    && l.EndDate.Value < DateTime.Today
                orderby l.StartDate, l.EndDate
                select new {l.Announcement1, l.StartDate, l.EndDate, l.AnnouncementID };
var lstAnnounce = query.ToList();

If you need a list of Annoucement objects:

var query = 
                from l in objVaccinationContext.Announcements
                where
                    l.StartDate.Value < DateTime.Today
                    && l.EndDate.Value < DateTime.Today
                orderby l.StartDate, l.EndDate
                select l;
List<Announcement> lstAnnounce = query.ToList();