experiments/csharp/E042-LinqBenchmarks/Program.cs

36 lines
850 B
C#

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
BenchmarkRunner.Run<LinqBenchmarks>();
[SimpleJob, MemoryDiagnoser(false)]
public class LinqBenchmarks
{
private readonly List<int> _list = Enumerable.Range(1, 1000000).ToList();
[Benchmark]
public int[] CustomLoop()
{
var array = new int[_list.Count];
var resultIndex = 0;
for (var index = 0; index < _list.Count; index++)
{
if (_list[index] % 2 == 0)
{
array[resultIndex++] = _list[index];
}
}
Array.Resize(ref array, resultIndex);
Array.Sort(array, (a, b) => b - a);
return array;
}
[Benchmark]
public int[] Where_OrderByDescending()
{
return _list.Where(i => i % 2 == 0).OrderByDescending(i => i).ToArray();
}
}