public static CarStatistics CalculateCarsStatistics(this IEnumerable <Car> car_List)
{
CarStatistics theseCarsStatictics = new CarStatistics();
foreach (var car in car_List)
{
theseCarsStatictics.Accumulate(car);
}
theseCarsStatictics.Compute();
return(theseCarsStatictics);
}
public static void Video6_10_Efficient_Aggregation_With_Extended_Method_Start()
{
Console.WriteLine("");
Console.WriteLine("Video6_10_Efficient_Aggregation_With_Extended_Method");
Console.WriteLine("----------------------");
Console.WriteLine("");
var cars = ProcessDataFromFiles.ProcessCar("fuel.csv");
var manufacturers = ProcessDataFromFiles.ProcessManufacturers("manufacturers.csv");
// Extension Method Syntax herunder.
Console.WriteLine("Extension Method Syntax");
Console.WriteLine("");
Console.WriteLine("");
var queryMethodSyntaxOwnFunction_Static =
cars.GroupBy(c => c.Manufacturer)
.Select(g =>
{
var results = CarStatistics.CalculateCarsStatistics_Static(g);
return(new
{
Name = g.Key,
Max = results.Max,
Min = results.Min,
Avg = results.Average,
NumberOfCars = results.NumberOfCars
});
})
.OrderByDescending(r => r.Max);
Console.WriteLine("Udskrift fra queryMethodSyntaxOwnFunction_Static");
Console.WriteLine("");
foreach (var result in queryMethodSyntaxOwnFunction_Static)
{
Console.WriteLine($"{result.Name} : ");
Console.WriteLine($"\t Antal {result.Name} biler : {result.NumberOfCars}");
Console.WriteLine($"\t Max : {result.Max}");
Console.WriteLine($"\t Min : {result.Min}");
Console.WriteLine($"\t Avg : {result.Avg}");
Console.WriteLine("");
}
Console.WriteLine("");
Console.WriteLine("");
var queryMethodSyntaxOwnFunction_Object =
cars.GroupBy(c => c.Manufacturer)
.Select(g =>
{
CarStatistics carStatistics_Object = new CarStatistics();
var results = carStatistics_Object.CalculateCarsStatistics_Object(g);
return(new
{
Name = g.Key,
Max = results.Max,
Min = results.Min,
Avg = results.Average,
NumberOfCars = results.NumberOfCars
});
})
.OrderByDescending(r => r.Max);
Console.WriteLine("Udskrift fra queryMethodSyntaxOwnFunction_Object");
Console.WriteLine("");
foreach (var result in queryMethodSyntaxOwnFunction_Object)
{
Console.WriteLine($"{result.Name} : ");
Console.WriteLine($"\t Antal {result.Name} biler : {result.NumberOfCars}");
Console.WriteLine($"\t Max : {result.Max}");
Console.WriteLine($"\t Min : {result.Min}");
Console.WriteLine($"\t Avg : {result.Avg}");
Console.WriteLine("");
}
Console.WriteLine("");
Console.WriteLine("");
var queryMethodSyntaxOwnFunction_ExtensionMethod =
cars.GroupBy(c => c.Manufacturer)
.Select(g =>
{
var results = g.CalculateCarsStatistics();
return(new
{
Name = g.Key,
Max = results.Max,
Min = results.Min,
Avg = results.Average,
NumberOfCars = results.NumberOfCars
});
})
.OrderByDescending(r => r.Max);
Console.WriteLine("Udskrift fra queryMethodSyntaxOwnFunction_Static");
Console.WriteLine("");
foreach (var result in queryMethodSyntaxOwnFunction_ExtensionMethod)
{
Console.WriteLine($"{result.Name} : ");
Console.WriteLine($"\t Antal {result.Name} biler : {result.NumberOfCars}");
Console.WriteLine($"\t Max : {result.Max}");
Console.WriteLine($"\t Min : {result.Min}");
Console.WriteLine($"\t Avg : {result.Avg}");
Console.WriteLine("");
}
Console.WriteLine("");
Console.WriteLine("");
var queryMethodSyntax_From_Scott_Allen_PLuralsight_Video =
cars.GroupBy(c => c.Manufacturer)
.Select(g =>
{
var results = g.Aggregate(new CarStatistics(),
(acc, c) => acc.Accumulate(c),
acc => acc.Compute());
return(new
{
Name = g.Key,
Max = results.Max,
Min = results.Min,
Avg = results.Average,
NumberOfCars = results.NumberOfCars
});
})
.OrderByDescending(r => r.Max);
// Ved at bruge syntaksen/ metoden herover undgår vi at skulle
// løbe igennem alle Cars 3 gange for at finde henholdsvis Max, Min
// og Average værdier.
Console.WriteLine("Udskrift fra queryMethodSyntax_From_Scott_Allen_PLuralsight_Video");
Console.WriteLine("");
foreach (var result in queryMethodSyntax_From_Scott_Allen_PLuralsight_Video)
{
Console.WriteLine($"{result.Name} : ");
Console.WriteLine($"\t Antal {result.Name} biler : {result.NumberOfCars}");
Console.WriteLine($"\t Max : {result.Max}");
Console.WriteLine($"\t Min : {result.Min}");
Console.WriteLine($"\t Avg : {result.Avg}");
Console.WriteLine("");
}
}