LINQ vs foreach vs pour les résultats des tests de performances

Quelqu'un pourrait expliquer ces résultats?
Je sais qu'il existe des doublons de questions, mais je n'ai pas encore trouvé une seule question qui est arrivé à la même conclusion que mes résultats 😮

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SpeedTest
{
class Person
{    
public Person(string name)
{
this.Name = name;
}
public string Name { get; set; }
}
class Program
{
static void Main(string[] args)
{
var people = new List<Person>();
AddTwins("FRANCISCO", people);
var stopwatch = new Stopwatch();
string name = "OCSICNARF";
long linqTime = 0L;
long foreachTime = 0L;
long forTime = 0L;
stopwatch.Start();
Person person0;
var result = from person in people
where person.Name == name
select person;
person0 = result.First();
linqTime = stopwatch.ElapsedMilliseconds;
stopwatch.Restart();
Person person1;
foreach (Person p in people)
{
if (p.Name == name)
{
person1 = p;
break;
}
}
foreachTime = stopwatch.ElapsedMilliseconds;
stopwatch.Restart();
Person person2;
for (int i = 0; i < people.Count; i++)
{
if (people[i].Name == name)
{
person2 = people[i];
break;
}
}
forTime = stopwatch.ElapsedMilliseconds;
stopwatch.Stop();
Console.WriteLine(string.Format("LINQ took {0}ms", linqTime));
Console.WriteLine(string.Format("FOREACH took {0}ms", foreachTime));
Console.WriteLine(string.Format("FOR took {0}ms", forTime));
}
static void AddTwins(string name, List<Person> people)
{
AddTwins(people, name, "");
}
private static void AddTwins(List<Person> people, string choices, string chosen)
{
if (choices.Length == 0)
{
people.Add(new Person(chosen));
}
else
{
for (int i = 0; i < choices.Length; i++)
{
//choose
char c = choices[i];
string choose1 = choices.Substring(0, i);
string choose2 = choices.Substring(i + 1);
choices = choose1 + choose2;
//explore
AddTwins(people, choices, chosen + c);
//Unchoose
string unchoose1 = choices.Substring(0, i);
string unchoose2 = choices.Substring(i);
choices = unchoose1 + c + unchoose2;
}
}
}
}
}

OriginalL'auteur Francisco Aguilera | 2014-04-04