Question

I’m pretty stuck on converting this to LINQ:

SELECT 
 COUNT(1) AS Registrations, 
 YEAR(Join_date) AS Year, 
 MONTH(Join_date) AS Month
FROM tblForumAuthor
GROUP BY YEAR(Join_date), MONTH(Join_date)
ORDER BY Year, Month

It’s just a simple report, but I can’t work out how to do the group by’s and counts as the select new. I’ve only managed this pathetic attempt:

var q = (from c in db.tblForumAuthors 
         select new {Year = c.Join_date.Year, 
                     Month = c.Join_date.Month, 
                     Registrations = });

Answer 1

var results = db.tblForumAuthors.GroupBy(r => new {Year = r.Join_date.Year, Month =  r.Join_date.Month})
                .Select(g => new {Registrations = g.Count(),  g.Key.Year, g.Key.Month})
                .OrderBy(r => r.Year)
                .ThenBy(r => r.Month)