static void ZipOperation()
{
var racerNames = from r in Formula1.GetChampions()
where r.Country == "Italy"
orderby r.Wins descending
select new
{
Name = r.FirstName + " " + r.LastName
};
var racerNamesAndStarts = from r in Formula1.GetChampions()
where r.Country == "Italy"
orderby r.Wins descending
select new
{
LastName = r.LastName,
Starts = r.Starts
};
//var racers = racerNames.Zip(racerNamesAndStarts, (first, second) => first.Name + ", starts: " + second.Starts);
//foreach (var r in racers)
//{
// Console.WriteLine(r);
//}
}
static void GroupingWithNestedObjects()
{
var countries = from r in Formula1.GetChampions()
group r by r.Country into g
orderby g.Count() descending, g.Key
where g.Count() >= 2
select new
{
Country = g.Key,
Count = g.Count(),
Racers = from r1 in g
orderby r1.LastName
select r1.FirstName + " " + r1.LastName
};
foreach (var item in countries)
{
Console.WriteLine("{0, -10} {1}", item.Country, item.Count);
foreach (var name in item.Racers)
{
Console.Write("{0}; ", name);
}
Console.WriteLine();
}
}
private static void SelectMany2()
{
// flatten the year list to return a list of all racers and positions in the championship
var racers = Formula1.GetChampionships()
.SelectMany(cs => new List <dynamic>()
{
new {
Year = cs.Year,
Position = 1,
Name = cs.First
},
new {
Year = cs.Year,
Position = 2,
Name = cs.Second
},
new {
Year = cs.Year,
Position = 3,
Name = cs.Third
}
});
foreach (var s in racers)
{
Console.WriteLine(s);
}
}
private static void CombineRacers()
{
var q = from r in Formula1.GetChampions()
join r2 in Formula1.GetChampionships().GetRacerInfo() on
new
{
FirstName = r.FirstName,
LastName = r.LastName
}
equals
new
{
FirstName = r2.FirstName,
LastName = r2.LastName
}
into yearResults
select new
{
FirstName = r.FirstName,
LastName = r.LastName,
Wins = r.Wins,
Starts = r.Starts,
Results = yearResults
};
foreach (var item in q)
{
Console.WriteLine("{0} {1}", item.FirstName, item.LastName);
foreach (var item2 in item.Results)
{
Console.WriteLine("{0} {1}", item2.Year, item2.Position);
}
}
}
static void GroupJoin2()
{
var racers = Formula1.GetChampionships()
.SelectMany(cs => new List <RacerInfo>()
{
new RacerInfo {
Year = cs.Year,
Position = 1,
FirstName = cs.First.FirstName(),
LastName = cs.First.LastName()
},
new RacerInfo {
Year = cs.Year,
Position = 2,
FirstName = cs.Second.FirstName(),
LastName = cs.Second.LastName()
},
new RacerInfo {
Year = cs.Year,
Position = 3,
FirstName = cs.Third.FirstName(),
LastName = cs.Third.LastName()
}
});
var q = (from r in Formula1.GetChampions()
join r2 in racers on
new
{
FirstName = r.FirstName,
LastName = r.LastName
}
equals
new
{
FirstName = r2.FirstName,
LastName = r2.LastName
}
into yearResults
select new
{
FirstName = r.FirstName,
LastName = r.LastName,
Wins = r.Wins,
Starts = r.Starts,
Results = yearResults
});
foreach (var r in q)
{
Console.WriteLine("{0} {1}", r.FirstName, r.LastName);
foreach (var results in r.Results)
{
Console.WriteLine("{0} {1}", results.Year, results.Position);
}
}
}
static void IndexFiltering()
{
var racers = Formula1.GetChampions().
Where((r, index) => r.LastName.StartsWith("A") && index % 2 != 0);
foreach (var r in racers)
{
Console.WriteLine("{0:A}", r);
}
}
static void Filtering()
{
var racers = from r in Formula1.GetChampions()
where r.Wins > 15 && (r.Country == "Brazil" || r.Country == "Austria")
select r;
foreach (var r in racers)
{
Console.WriteLine("{0:A}", r);
}
}
private static void Sorting()
{
var racers = (from r in Formula1.GetChampions()
orderby r.Country, r.LastName, r.FirstName
select r).Take(10);
foreach (var racer in racers)
{
Console.WriteLine("{0}: {1}, {2}", racer.Country, racer.LastName, racer.FirstName);
}
}
static void CompoundFrom()
{
var ferrariDrivers = from r in Formula1.GetChampions()
from c in r.Cars
where c == "Ferrari"
orderby r.LastName
select r.FirstName + " " + r.LastName;
foreach (var racer in ferrariDrivers)
{
Console.WriteLine(racer);
}
}
static void Untyped()
{
var list = new System.Collections.ArrayList(Formula1.GetChampions() as System.Collections.ICollection);
var query = from r in list.Cast <Racer>()
where r.Country == "USA"
orderby r.Wins descending
select r;
foreach (var racer in query)
{
Console.WriteLine("{0:A}", racer);
}
}
static void SetOperations()
{
Func <string, IEnumerable <Racer> > racersByCar =
car => from r in Formula1.GetChampions()
from c in r.Cars
where c == car
orderby r.LastName
select r;
Console.WriteLine("World champion with Ferrari and McLaren");
foreach (var racer in racersByCar("Ferrari").Intersect(racersByCar("McLaren")))
{
Console.WriteLine(racer);
}
}
static void Grouping()
{
var countries = from r in Formula1.GetChampions()
group r by r.Country into g
orderby g.Count() descending, g.Key
where g.Count() >= 2
select new
{
Country = g.Key,
Count = g.Count()
};
foreach (var item in countries)
{
Console.WriteLine("{0, -10} {1}", item.Country, item.Count);
}
}
static void Aggregate()
{
var query = from r in Formula1.GetChampions()
let numberYears = r.Years.Count()
where numberYears >= 3
orderby numberYears descending, r.LastName
select new
{
Name = r.FirstName + " " + r.LastName,
TimesChampion = numberYears
};
foreach (var r in query)
{
Console.WriteLine("{0} {1}", r.Name, r.TimesChampion);
}
}
static void Aggregate2()
{
var countries = (from c in
from r in Formula1.GetChampions()
group r by r.Country into c
select new
{
Country = c.Key,
Wins = (from r1 in c
select r1.Wins).Sum()
}
orderby c.Wins descending, c.Country
select c).Take(5);
foreach (var country in countries)
{
Console.WriteLine("{0} {1}", country.Country, country.Wins);
}
}
private static void Except()
{
var racers = Formula1.GetChampionships().SelectMany(cs => new List <RacerInfo>()
{
new RacerInfo {
Year = cs.Year,
Position = 1,
FirstName = cs.First.FirstName(),
LastName = cs.First.LastName()
},
new RacerInfo {
Year = cs.Year,
Position = 2,
FirstName = cs.Second.FirstName(),
LastName = cs.Second.LastName()
},
new RacerInfo {
Year = cs.Year,
Position = 3,
FirstName = cs.Third.FirstName(),
LastName = cs.Third.LastName()
}
});
var nonChampions = racers.Select(r =>
new
{
FirstName = r.FirstName,
LastName = r.LastName
}).Except(Formula1.GetChampions().Select(r =>
new
{
FirstName = r.FirstName,
LastName = r.LastName
}));
foreach (var r in nonChampions)
{
Console.WriteLine("{0} {1}", r.FirstName, r.LastName);
}
}
static void GroupJoin()
{
// var q =
//from c in categories
//join p in products on c equals p.Category into ps
//select new { Category = c, Products = ps };
var racers = from r in Formula1.GetChampions()
from y in r.Years
select new
{
Year = y,
Name = r.FirstName + " " + r.LastName
};
var teams = from t in Formula1.GetContructorChampions()
from y in t.Years
select new
{
Year = y,
Name = t.Name
};
var racersAndTeams =
from r in racers
join t in teams on r.Year equals t.Year into ts
select new
{
Year = r.Year,
Racer = r.Name,
Constructor = ts
};
foreach (var r in racersAndTeams)
{
Console.WriteLine("{0} {1}", r.Year, r.Racer);
foreach (var t in r.Constructor)
{
Console.WriteLine("\t{0}", t.Name);
}
}
}
static void LeftOuterJoin()
{
var racers = from r in Formula1.GetChampions()
from y in r.Years
select new
{
Year = y,
Name = r.FirstName + " " + r.LastName
};
var teams = from t in Formula1.GetContructorChampions()
from y in t.Years
select new
{
Year = y,
Name = t.Name
};
var racersAndTeams =
(from r in racers
join t in teams on r.Year equals t.Year into rt
from t in rt.DefaultIfEmpty()
orderby r.Year
select new
{
Year = r.Year,
Champion = r.Name,
Constructor = t == null ? "no constructor championship" : t.Name
}).Take(10);
Console.WriteLine("Year Champion\t\t Constructor Title");
foreach (var item in racersAndTeams)
{
Console.WriteLine("{0}: {1,-20} {2}",
item.Year, item.Champion, item.Constructor);
}
}
static void InnerJoin()
{
var racers = from r in Formula1.GetChampions()
from y in r.Years
select new
{
Year = y,
Name = r.FirstName + " " + r.LastName
};
var teams = from t in Formula1.GetContructorChampions()
from y in t.Years
select new
{
Year = y,
Name = t.Name
};
var racersAndTeams =
(from r in racers
join t in teams on r.Year equals t.Year
orderby t.Year
select new
{
Year = r.Year,
Champion = r.Name,
Constructor = t.Name
}).Take(10);
Console.WriteLine("Year World Champion\t Constructor Title");
foreach (var item in racersAndTeams)
{
Console.WriteLine("{0}: {1,-20} {2}",
item.Year, item.Champion, item.Constructor);
}
}
static void Partitioning()
{
int pageSize = 5;
int numberPages = (int)Math.Ceiling(Formula1.GetChampions().Count() /
(double)pageSize);
for (int page = 0; page < numberPages; page++)
{
Console.WriteLine("Page {0}", page);
var racers =
(from r in Formula1.GetChampions()
orderby r.LastName, r.FirstName
select r.FirstName + " " + r.LastName).
Skip(page * pageSize).Take(pageSize);
foreach (var name in racers)
{
Console.WriteLine(name);
}
Console.WriteLine();
}
}
