Umbraco-CMS/tests/Umbraco.Tests.Benchmarks/LinqCastBenchmarks.cs

using System.Collections.Generic;
using System.Linq;
using BenchmarkDotNet.Attributes;

namespace Umbraco.Tests.Benchmarks;

/// <summary>
///     Want to check what is faster OfType or Cast when a enurable all has the same items
/// </summary>
[MemoryDiagnoser]
public class LinqCastBenchmarks
{
    private readonly List<object> _array;

    public LinqCastBenchmarks()
    {
        _array = new List<object>();
        _array.AddRange(Enumerable.Range(0, 10000).Select(x => x.ToString()));
    }

    [Benchmark(Baseline = true)]
    public void OfType()
    {
        foreach (var i in _array.OfType<string>())
        {
            var a = i;
        }
    }

    [Benchmark]
    public void Cast()
    {
        foreach (var i in _array.Cast<string>())
        {
            var a = i;
        }
    }

    [Benchmark]
    public void ExplicitCast()
    {
        foreach (var i in _array)
        {
            var a = (string)i;
        }
    }
}