Question

I have that query :

var group = query.GroupBy(x => new
{
   ...
   TestName =  isSelected ? x.ClassA.Name : "" 
});

var select = group.Select(y => new MyResultDTO()
{
   ...
   TestName = isSelected ? y.First().ClassA.Name : ""  
});

That is not woriking … I got an error :

Column ‘tblClassA.Name’ is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

But if I change my groupBy to only (take of condicional clause):

TestName = x.ClassA.Name 

It works fine…
Any idea how can I do that condicional GroupBy/Select ?

I´m using NHibernate 3.3.1

Paul

Answer 1

Not sure of what you want to achieve, but have you tried writing ?

var select = group.Select(y => new MyResultDTO()
{
   ...
   TestName = y.Key.TestName  
});

Also, you may try something like this for your group :

var group = query.Where(isSel=>isSel.isSelected).GroupBy(x => new
{
   ...
   TestName =  x.ClassA.Name 
})
.Union(query.Where(isSel=>!isSel.isSelected).GroupBy(x => new
{
   ...
   TestName = "" 
});

Hope this will help