private static void ElementOperators()
{
Console.WriteLine("Elements");
List <F1Team> teams = F1Data.GetTeams();
F1Team team = teams.ElementAt(0);
team = teams.First(t => t.TeamName.Contains("a"));
team = teams.Last();
team = teams.SingleOrDefault(t => t.Pilots.Length == 3);
}
private static void Aggregate()
{
Console.WriteLine("----Elements");
List <F1Team> teams = F1Data.GetTeams();
int countTeam = teams.Count(t => t.Wins > 0);
var query = from team in teams
let points = team.Pilots.Sum(p => p.Points)
orderby points descending
select new { team.TeamName, points };
Dump(query);
int sumPoints = teams.Where(t => t.TeamName.Contains("Ferrari")).SelectMany(t => t.Pilots).Sum(p => p.Points);
int[] array = { 1, 2, 3, 4, 5 };
int sum1 = array.Sum();
var queryAverage = from team in teams
select new { team.TeamName, AvgPoints = team.Pilots.Average(p => p.Points) };
Dump(queryAverage);
int max = (from team in teams
from pilot in team.Pilots
select pilot.Points).Max();
Console.WriteLine("max={0}", max);
int min = (from team in teams
from pilot in team.Pilots
select pilot).Min(p => p.Points);
Console.WriteLine("max={0}", max);
string first = (from team in teams
select team.TeamName).Min();
string frase = "ti voglio tanto bene"; //esempio dedicato alla mia amica Francesca
var acronimo = frase.Split(' ').Aggregate("", (result, word) => result + word.ToUpper().First() + ".");
Console.WriteLine(acronimo); //stampa TVTB
var queryAggregate = from team in teams
select new { Points = team.Pilots.Aggregate(0, (total, p) => total + p.Points) };
Dump(queryAggregate);
}
public static void IntoClause()
{
Console.WriteLine("---- Into Clause");
List <F1Team> teams = F1Data.GetTeams();
var query = from team in teams
where team.Wins > 2
select team.Pilots
into topTeamPilots
from tp in topTeamPilots
where tp.Points > 50
orderby tp.Points descending
select tp.LastName + " " + tp.FirstName + ": " + tp.Points;
Dump(query);
}
public static void Quantifier()
{
Console.WriteLine("Quantifiers");
var teams = F1Data.GetTeams();
int[] array = { 1, 2, 3, 4 };
bool contains = array.Contains(1);
bool allpositive = array.All(i => i > 0);
var query = teams.Where(t => t.Pilots.All(p => p.Points > 0));
Console.WriteLine("All");
Dump(query);
var queryAny = teams.Where(t => t.Pilots.Any(p => p.Points > 100));
Console.WriteLine("Any");
Dump(queryAny);
}
private static void Conversions()
{
Console.WriteLine("Elements");
List <F1Team> teams = F1Data.GetTeams();
var query1 = teams.Where(t => t.Wins > 0).AsEnumerable();
List <F1Team> list = teams.Where(t => t.Wins > 0).ToList();
Pilot[] array = teams.SelectMany(t => t.Pilots).ToArray();
Dictionary <string, Pilot[]> dict = (from team in teams
where team.Wins > 0
select team).ToDictionary(t => t.TeamName, t => t.Pilots);
foreach (string key in dict.Keys)
{
Console.WriteLine(key);
foreach (Pilot p in dict[key])
{
Console.WriteLine("- {0}: {1}", p.LastName, p.Points);
}
}
ILookup <F1Team, Pilot[]> lookup = (from team in teams
where team.Wins > 0
select team).ToLookup(t => t, t => t.Pilots);
Dump(lookup);
List <object> lista = new List <object>()
{
"a", 1, "b", 2, "c"
};
var stringhe = lista.OfType <string>();
int[] intArray = { 1, 2, 3, 4, 5 };
var objArray = intArray.Cast <object>();
}
public static void Grouping()
{
Console.WriteLine("---- grouping");
List <F1Team> teams = F1Data.GetTeams();
var query = from team in teams
from pilot in team.Pilots
group pilot by team;
foreach (var group in query)
{
Console.WriteLine(group.Key);
foreach (var pilot in group)
{
Console.WriteLine(" - {0} {1}", pilot.FirstName, pilot.LastName);
}
}
foreach (IGrouping <F1Team, Pilot> group in query)
{
F1Team team = group.Key;
Console.WriteLine(team);
foreach (Pilot pilot in group)
{
Console.WriteLine(" - {0} {1}", pilot.FirstName, pilot.LastName);
}
}
var query2 = from team in teams
from pilot in team.Pilots
group pilot by team into t
select new { t.Key, t };
foreach (var pilot in query2)
{
Console.WriteLine(pilot.Key);
}
}
public static void LetClause()
{
Console.WriteLine("---- let");
List <F1Team> teams = F1Data.GetTeams();
var query = from team in teams
let wins = team.Wins
orderby wins descending
where wins > 3
select team.TeamName + ": " + wins;
Dump(query);
query = from team in teams
let wins = team.Wins
let pilots = team.Pilots
from pilot in pilots
where pilot.Points > 80
orderby wins descending
select team.TeamName + " wins: " + wins + ", leader " + pilot.LastName + " " + pilot.Points;
Dump(query);
}
public static void Filtering()
{
Console.WriteLine("Filtering");
List <F1Team> teams = F1Data.GetTeams();
var query = from team in teams
where team.Wins > 0 &&
team.TeamName.ToLower().StartsWith("m")
select team;
query.Count();
Dump(query);
Console.WriteLine("Where<T>");
var query2 = teams.Where(team => team.Wins > 0 &&
team.TeamName.ToLower().StartsWith("m"));
Dump(query2);
Console.WriteLine("Where<T,index>");
var query3 = teams.Where((team, index) => index % 2 == 0);
Dump(query3);
}
private static void Generators()
{
Console.WriteLine("----Generation");
var teams = F1Data.GetTeams();
var months = Enumerable.Range(1, 12).Select(n => CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(n));
months.ToList().ForEach(Console.WriteLine);
int[] array = Enumerable.Repeat <int>(1, 10).ToArray();
var expr = Enumerable.Repeat((from team in teams select team.TeamName), 10);
IEnumerable <Pilot> pilots = Enumerable.Empty <Pilot>();
foreach (var pilot in pilots.DefaultIfEmpty(new Pilot()
{
LastName = "Sconosciuto"
}))
{
Console.WriteLine(pilot.LastName);
}
}
public static void Join()
{
Console.WriteLine("---- join");
List <F1Team> teams = F1Data.GetTeams();
var query = from team in teams
from pilot in team.Pilots
join country in Country.All on pilot.IDCountry equals country.IDCountry
select new { pilot.LastName, CountryName = country.Name };
foreach (var p in query)
{
Console.WriteLine("{0} ({1})", p.LastName, p.CountryName);
}
Console.WriteLine("----Join method");
var query2 = teams.SelectMany(t => t.Pilots).Join(
Country.All,
pilot => pilot.IDCountry,
country => country.IDCountry,
(p, c) => new { p.LastName, CountryName = c.Name });
foreach (var p in query2)
{
Console.WriteLine("{0} ({1})", p.LastName, p.CountryName);
}
Console.WriteLine("----join into");
var pilots = from team in teams
from pilot in team.Pilots
select pilot;
var query3 = from country in Country.All
join pilot in pilots on country.IDCountry equals pilot.IDCountry
into pilotsxCountry
select new { CountryName = country.Name, Pilots = pilotsxCountry };
foreach (var group in query3)
{
Console.WriteLine(group.CountryName);
foreach (Pilot pilot in group.Pilots)
{
Console.WriteLine(" {0} {1}", pilot.LastName, pilot.FirstName);
}
}
Console.WriteLine("---GroupJoin");
IEnumerable <Pilot> pilots2 = teams.SelectMany(t => t.Pilots);
var query4 = Country.All.GroupJoin(
pilots2,
country => country.IDCountry,
pilot => pilot.IDCountry,
(c, p) => new { CountryName = c.Name, Pilots = p });
foreach (var group in query4)
{
Console.WriteLine(group.CountryName);
foreach (Pilot pilot in group.Pilots)
{
Console.WriteLine(" {0} {1}", pilot.LastName, pilot.FirstName);
}
}
}