LINQ sorting anonymous types?

Question

How do I do sorting when generating anonymous types in linq to sql?

Ex:

from e in linq0
order by User descending /* ??? */
select new
{
   Id = e.Id,
            


        

Answer 1

Would this work, as a way of avoiding Jon's select...into?

from e in linq0
let comment = new
    {
       Id = e.Id,
       CommentText = e.CommentText,
       UserId = e.UserId,
       User = (e.User.FirstName + " " + e.User.LastName).Trim()),
       Date = string.Format("{0:d}", e.Date)
    }
orderby comment.User descending
select comment

Answer 2

If I've understood your question correctly, you want to do this:

from e in linq0
order by (e.User.FirstName + " " + e.User.LastName).Trim()) descending 
select new
{
   Id = e.Id,
   CommentText = e.CommentText,
   UserId = e.UserId,
   User = (e.User.FirstName + " " + e.User.LastName).Trim()),
   Date = string.Format("{0:d}", e.Date)
}

Answer 3

I'm going to get a necromancer badge for this answer, but I still think it's worth showing this snippet.

var records = await (from s in db.S
  join l in db.L on s.LId equals l.Id
  where (...)
  select new { S = s, Type = l.MyType }
  ).ToListAsync();

//Data is retrieved from database by now. 
//OrderBy below is LINQ to Objects, not LINQ to SQL

if (sortbyABC)
{
  //Sort A->B->C
  records.OrderBy(sl => sl.Type, new ABC());
}
else
{
   //Sort B->A->C
   records.OrderBy(sl => sl.Type, new BAC());
}

ABC and BAC implement IComparer<MyType>.

Answer 4

If you're using LINQ to Objects, I'd do this:

var query = from e in linq0
            select new
            {
                Id = e.Id,
                CommentText = e.CommentText,
                UserId = e.UserId,
                User = (e.User.FirstName + " " + e.User.LastName).Trim()),
                Date = e.Date.ToString("d")
            } into anon
            orderby anon.User descending
            select anon;

That way the string concatenation only has to be done once.

I don't know what that would do in LINQ to SQL though...