Benchmarks using the params keyword in C#

ParamsBenchmarks.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Columns;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Reports;

namespace BenchmarkDotNet.Samples
{
    [Config(typeof(Config))]
    [SimpleJob(RuntimeMoniker.Net80)]
    [MemoryDiagnoser]
    [ReturnValueValidator(failOnError:true)]
    [HideColumns(Column.Job, Column.RatioSD, Column.AllocRatio)]
    public class ParamsBenchmark
    {
        [Benchmark(Baseline = true)]
        public string MethodWith3Params() => StandardMethod3("param1", "param2", "param3");

        [Benchmark]
        public string MethodWithParams3() => ParamsMethod("param1", "param2", "param3");

        [Benchmark]
        public string MethodWithArray3() => ArrayMethod(new string[] { "param1", "param2", "param3" });

        
        public string StandardMethod3(string p1, string p2, string p3) => p1 + p2 + p3;

        public string ParamsMethod(params string[] args)
        {
            var result = "";
            foreach (var arg in args)
            {
                result += arg;
            }
            return result;
        }

        public string ArrayMethod(string[] args)
        {
            var result = "";
            foreach (var arg in args)
            {
                result += arg;
            }
            return result;
        }

        private class Config : ManualConfig
        {
            public Config()
            {
                SummaryStyle =
                    SummaryStyle.Default.WithRatioStyle(RatioStyle.Percentage);
            }
        }
    }
}