private void RunSecondPrototype()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
SingerGenderComparer comparer = new SingerGenderComparer();
IEnumerable <IGrouping <int, Concert> > concertGroups = concerts.GroupBy(c => c.SingerId, comparer);
foreach (IGrouping <int, Concert> concertGroup in concertGroups)
{
Console.WriteLine("Concerts of {0} singers: ", comparer.IsPerformedByFemaleSinger(concertGroup.Key) ? "female" : "male");
foreach (Concert concert in concertGroup)
{
Console.WriteLine("Number of concerts: {0}, in the year of {1} by singer {2}.", concert.ConcertCount, concert.Year, concert.SingerId);
}
}
IEnumerable <IGrouping <int, int> > concertGroupsFiltered = concerts.GroupBy(c => c.SingerId, c => c.ConcertCount, comparer);
foreach (IGrouping <int, int> concertGroup in concertGroupsFiltered)
{
Console.WriteLine("Concerts of {0} singers: ", comparer.IsPerformedByFemaleSinger(concertGroup.Key) ? "female" : "male");
foreach (int concertCount in concertGroup)
{
Console.WriteLine("Number of concerts: {0}.", concertCount);
}
}
}
private void RunFirstPrototype()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
IEnumerable <IGrouping <int, Concert> > concertGroups = concerts.GroupBy(c => c.SingerId);
foreach (IGrouping <int, Concert> concertGroup in concertGroups)
{
Console.WriteLine("Concerts for singer of ID {0}:", concertGroup.Key);
foreach (Concert concert in concertGroup)
{
Console.WriteLine("Number of concerts: {0}, in the year of {1}.", concert.ConcertCount, concert.Year);
}
}
IEnumerable <IGrouping <int, int> > concertGroupsFiltered = concerts.GroupBy(c => c.SingerId, c => c.ConcertCount);
foreach (IGrouping <int, int> concertGroup in concertGroupsFiltered)
{
Console.WriteLine("Concerts for singer of ID {0}:", concertGroup.Key);
foreach (int concertCount in concertGroup)
{
Console.WriteLine("Number of concerts: {0}.", concertCount);
}
}
}
public void RunDemo()
{
IEnumerable <int> integers = Enumerable.Range(1, 100);
int sum = integers.Sum();
Console.WriteLine(sum);
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
int allConcerts = concerts.Sum(c => c.ConcertCount);
Console.WriteLine(allConcerts);
}
public void RunSelectManyOperatorExampleComplex()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
var singerConcerts = singers.SelectMany(s => concerts.Where(c => c.SingerId == s.Id)
.Select(c => new { Year = c.Year, ConcertCount = c.ConcertCount, Name = string.Concat(s.FirstName, " ", s.LastName) }));
foreach (var item in singerConcerts)
{
Console.WriteLine(string.Concat(item.Name, ", ", item.Year, ", ", item.ConcertCount));
}
}
public void RunDemo()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
var singerConcerts = singers.Join(concerts, s => s.Id, c => c.SingerId, (s, c) => new
{
Id = s.Id,
SingerName = string.Concat(s.FirstName, " ", s.LastName),
ConcertCount = c.ConcertCount,
Year = c.Year
});
foreach (var res in singerConcerts)
{
Console.WriteLine(string.Concat(res.Id, ": ", res.SingerName, ", ", res.Year, ", ", res.ConcertCount));
}
}
