private static void LinqToEntities()
{
using (var data = new Formula1Entities())
{
var racers = from r in data.Racers
where r.Wins > 40
orderby r.Wins descending
select r;
foreach (Racer r in racers)
{
Console.WriteLine("{0} {1}", r.FirstName, r.LastName);
}
}
}
private static void ObjectQuery()
{
using (Formula1Entities data = new Formula1Entities())
{
//ObjectSet<Racer> racers = data.Racers;
//Console.WriteLine(racers.CommandText);
//Console.WriteLine(racers.ToTraceString());
string country = "Brazil";
ObjectQuery <Racer> racers = data.Racers.Where("it.Nationality = @Country",
new ObjectParameter("Country", country));
Console.WriteLine(racers.CommandText);
Console.WriteLine(racers.ToTraceString());
}
}
private static void ObjectQueryFiltering()
{
using (var data = new Formula1Entities())
{
string country = "USA";
ObjectQuery <Racer> racers = data.Racers.Where("it.Nationality = @Country",
new ObjectParameter("Country", country))
.OrderBy("it.Wins DESC, it.Starts DESC")
.Top("3");
foreach (var racer in racers)
{
Console.WriteLine("{0} {1}, wins: {2}, starts: {3}",
racer.FirstName, racer.LastName, racer.Wins, racer.Starts);
}
}
}
private static void LinqToEntities2()
{
using (var data = new Formula1Entities())
{
var query = from r in data.Racers
from rr in r.RaceResults
where rr.Position <= 3 && rr.Position >= 1 &&
r.Nationality == "Switzerland"
group r by r.Id into g
let podium = g.Count()
orderby podium descending
select new
{
Racer = g.FirstOrDefault(),
Podiums = podium
};
foreach (var r in query)
{
Console.WriteLine("{0} {1} {2}", r.Racer.FirstName, r.Racer.LastName,
r.Podiums);
}
}
}
