Here’s som simple code to transform an array or list from one type to another:
Kursdeltagare[] kdArr = ...
// Alternative 1
var kdDtos = matchingKd.Select(kd => new KursdeltagareDto()
{
PersonId = kd.PersonID,
Fornamn = kd.Fornamn,
Efternamn = kd.Efternamn
}).ToList();
// Alternative 2
var kdDtos2 = (from kd in matchingKd
select new KursdeltagareDto()
{
PersonId = kd.PersonID,
Fornamn = kd.Fornamn,
Efternamn = kd.Efternamn
}
).ToList();
Both alternatives will give the same result but the first one contains slightly less code. Which is better from a performance point of view? If you know, feel free to leave a comment…
/Emil

I believe those are exactly the same. Linq queries are converted to calls to lambda extension methods by the compiler. I guess that if you looked at the IL code generated by both alternatives, it would probably be exactly the same.