Я сделал некоторую ориентир в отношении списка. Контроль, Array.Contains, iEnumerable.Contains, icorglection.contains и iList.contains.
Результаты:
array pure 00:00:45.0052754 // 45 sec, slow
array as IList 00:00:02.7900305
array as IEnumerable 00:00:46.5871087 // 45 sec, slow
array as ICollection 00:00:02.7449889
list pure 00:00:01.9907563
list as IList 00:00:02.6626009
list as IEnumerable 00:00:02.9541950
list as ICollection 00:00:02.3341203
, поскольку я узнаю, что это будет очень медленно, если вызов Array.Contains
напрямую (что эквивалентно вызову iEnumerable)
Также я чувствую себя странным Страница массива MSDN не имеет , содержит метод
, перечисленный в разделе «Расширение».
Образец кода:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
namespace arrayList
{
class Program
{
static void Main(string[] args)
{
Stopwatch watch = new Stopwatch();
Int64 n = 100000000;
Int64[] myarray = new Int64[] { 1, 2, 3 };
List<Int64> mylist = new List<Int64>(myarray);
watch.Start();
for (Int64 j = 0; j < n; j++)
{
bool i = myarray.Contains(2);
}
watch.Stop();
Console.WriteLine("array pure {0}", watch.Elapsed);
watch.Restart();
for (Int64 j = 0; j < n; j++)
{
bool i = (myarray as IList<Int64>).Contains(2);
}
watch.Stop();
Console.WriteLine("array as IList {0}",watch.Elapsed);
watch.Restart();
for (Int64 j = 0; j < n; j++)
{
bool i = (myarray as IEnumerable<Int64>).Contains(2);
}
watch.Stop();
Console.WriteLine("array as IEnumerable {0}",watch.Elapsed);
watch.Restart();
for (Int64 j = 0; j < n; j++)
{
bool i = (myarray as ICollection<Int64>).Contains(2);
}
watch.Stop();
Console.WriteLine("array as ICollection {0}",watch.Elapsed);
watch.Restart();
for (Int64 j = 0; j < n; j++)
{
bool i = mylist.Contains(2);
}
watch.Stop();
Console.WriteLine("list pure {0}", watch.Elapsed);
watch.Restart();
for (Int64 j = 0; j < n; j++)
{
bool i = (mylist as IList<Int64>).Contains(2);
}
watch.Stop();
Console.WriteLine("list as IList {0}", watch.Elapsed);
watch.Restart();
for (Int64 j = 0; j < n; j++)
{
bool i = (mylist as IEnumerable<Int64>).Contains(2);
}
watch.Stop();
Console.WriteLine("list as IEnumerable {0}", watch.Elapsed);
watch.Restart();
for (Int64 j = 0; j < n; j++)
{
bool i = (mylist as ICollection<Int64>).Contains(2);
}
watch.Stop();
Console.WriteLine("list as ICollection {0}", watch.Elapsed);
Console.ReadKey();
}
}
}