linq to sql Distinct and orderby

Question

var result = table1.Join(table2, o => o.ProgramID, t => t.ProgramID, (o, t) => new { o.ProgramID, t.Program })
         .OrderBy(t => t.Program)
                 


        

Answer 1

I don't know if it will help, but you can try something like this;

var result = (from o in table1
              join t in table2 on o.ProgramID equals t.ProgramID
              orderby t.Program
              select new { o.ProgramID, t.Program }).Distinct();

Answer 2

I tried this and that works:

var result = (from o in table1
              join t in table2 on o.ProgramID equals t.ProgramID
              select new { o.ProgramID, t.Program })
              .Distinct().OrderBy(t => t.Program)
                         .ThenBy(t => t.ProgramName)
                         .ThenBy(t => t.Description); 

First you do Distinct and then OrderBy, then OrderBy works.

Answer 3

Profile the two queries, comparing stats-IO and the actual execution plan. It is entirely possible that it makes zero difference to the SQL server.

If you really want known TSQL, use ExecuteQuery-of-T and pass in the TSQL yourself. Maybe include some lock hints too (most commonly: NOLOCK)