StatusCodeBoxingBenchmarks.cs

using BenchmarkDotNet.Attributes;
using System.Collections.Frozen;

[MemoryDiagnoser]
public class StatusCodeBoxingBenchmarks
{
    [Benchmark]
    public object Get1_FrozenDictionary()
    {
        return GetBoxedStatusCode_FrozenDictionary(200);
    }

    [Benchmark]
    public object Get1_LazyArray()
    {
        return GetBoxedStatusCode_LazyArray(200);
    }

    [Benchmark]
    public object Get4_FrozenDictionary()
    {
        _ = GetBoxedStatusCode_FrozenDictionary(500);
        _ = GetBoxedStatusCode_FrozenDictionary(400);
        _ = GetBoxedStatusCode_FrozenDictionary(300);
        return GetBoxedStatusCode_FrozenDictionary(200);
    }

    [Benchmark]
    public object Get4_LazyArray()
    {
        _ = GetBoxedStatusCode_LazyArray(500);
        _ = GetBoxedStatusCode_LazyArray(400);
        _ = GetBoxedStatusCode_LazyArray(300);
        return GetBoxedStatusCode_LazyArray(200);
    }

    [Benchmark]
    public void Get100_FrozenDictionary()
    {
        for (int i = 100; i < 200; i++)
        {
            _ = GetBoxedStatusCode_FrozenDictionary(i);
        }
    }

    [Benchmark]
    public void Get100_LazyArray()
    {
        for (int i = 100; i < 200; i++)
        {
            _ = GetBoxedStatusCode_LazyArray(i);
        }
    }

    private static readonly FrozenDictionary<int, object> BoxedStatusCodes = FrozenDictionary.ToFrozenDictionary(new[]
    {
        KeyValuePair.Create<int, object>(100, 100),
        KeyValuePair.Create<int, object>(101, 101),
        KeyValuePair.Create<int, object>(102, 102),

        KeyValuePair.Create<int, object>(200, 200),
        KeyValuePair.Create<int, object>(201, 201),
        KeyValuePair.Create<int, object>(202, 202),
        KeyValuePair.Create<int, object>(203, 203),
        KeyValuePair.Create<int, object>(204, 204),
        KeyValuePair.Create<int, object>(205, 205),
        KeyValuePair.Create<int, object>(206, 206),
        KeyValuePair.Create<int, object>(207, 207),
        KeyValuePair.Create<int, object>(208, 208),
        KeyValuePair.Create<int, object>(226, 226),

        KeyValuePair.Create<int, object>(300, 300),
        KeyValuePair.Create<int, object>(301, 301),
        KeyValuePair.Create<int, object>(302, 302),
        KeyValuePair.Create<int, object>(303, 303),
        KeyValuePair.Create<int, object>(304, 304),
        KeyValuePair.Create<int, object>(305, 305),
        KeyValuePair.Create<int, object>(306, 306),
        KeyValuePair.Create<int, object>(307, 307),
        KeyValuePair.Create<int, object>(308, 308),

        KeyValuePair.Create<int, object>(400, 400),
        KeyValuePair.Create<int, object>(401, 401),
        KeyValuePair.Create<int, object>(402, 402),
        KeyValuePair.Create<int, object>(403, 403),
        KeyValuePair.Create<int, object>(404, 404),
        KeyValuePair.Create<int, object>(405, 405),
        KeyValuePair.Create<int, object>(406, 406),
        KeyValuePair.Create<int, object>(407, 407),
        KeyValuePair.Create<int, object>(408, 408),
        KeyValuePair.Create<int, object>(409, 409),
        KeyValuePair.Create<int, object>(410, 410),
        KeyValuePair.Create<int, object>(411, 411),
        KeyValuePair.Create<int, object>(412, 412),
        KeyValuePair.Create<int, object>(413, 413),
        KeyValuePair.Create<int, object>(414, 414),
        KeyValuePair.Create<int, object>(415, 415),
        KeyValuePair.Create<int, object>(416, 416),
        KeyValuePair.Create<int, object>(417, 417),
        KeyValuePair.Create<int, object>(418, 418),
        KeyValuePair.Create<int, object>(419, 419),
        KeyValuePair.Create<int, object>(421, 421),
        KeyValuePair.Create<int, object>(422, 422),
        KeyValuePair.Create<int, object>(423, 423),
        KeyValuePair.Create<int, object>(424, 424),
        KeyValuePair.Create<int, object>(426, 426),
        KeyValuePair.Create<int, object>(428, 428),
        KeyValuePair.Create<int, object>(429, 429),
        KeyValuePair.Create<int, object>(431, 431),
        KeyValuePair.Create<int, object>(451, 451),
        KeyValuePair.Create<int, object>(499, 499),

        KeyValuePair.Create<int, object>(500, 500),
        KeyValuePair.Create<int, object>(501, 501),
        KeyValuePair.Create<int, object>(502, 502),
        KeyValuePair.Create<int, object>(503, 503),
        KeyValuePair.Create<int, object>(504, 504),
        KeyValuePair.Create<int, object>(505, 505),
        KeyValuePair.Create<int, object>(506, 506),
        KeyValuePair.Create<int, object>(507, 507),
        KeyValuePair.Create<int, object>(508, 508),
        KeyValuePair.Create<int, object>(510, 510),
        KeyValuePair.Create<int, object>(511, 511)
    });

    private static object GetBoxedStatusCode_FrozenDictionary(int statusCode)
    {
        if (BoxedStatusCodes.TryGetValue(statusCode, out var result))
        {
            return result;
        }

        return statusCode;
    }

    private static readonly object[] s_boxedStatusCodes = new object[512];
    private static object GetBoxedStatusCode_LazyArray(int statusCode)
    {
        object[] boxes = s_boxedStatusCodes;
        return (uint)statusCode < (uint)boxes.Length
            ? boxes[statusCode] ??= statusCode
            : statusCode;
    }
}