Performance benchmark for string interpolations

StringConcatSimple.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Columns;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Running;
using BenchmarkDotNet.Samples;
using System;
using System.Text;

//var s = new StringConcatSimple();
//Console.WriteLine(s.StringInterpolation());
//Console.WriteLine(s.StringJoin());
//Console.WriteLine(s.StringConcat());
//Console.WriteLine(s.StringCreate());

BenchmarkRunner.Run<StringConcatSimple>();

namespace BenchmarkDotNet.Samples {
    
    //[SimpleJob(RuntimeMoniker.Net60, baseline: true)]
    [SimpleJob(RuntimeMoniker.Net70)]
    [HideColumns(Column.Job, Column.RatioSD, Column.AllocRatio)]
    [MemoryDiagnoser]
    public class StringConcatSimple {

        private string title = "Mr.", firstName = "David", middleName = "Patrick", lastName = "Callan";

        //[Benchmark]
        //public string StringBuilder() {
        //    var stringBuilder =
        //        new StringBuilder();

        //    return stringBuilder
        //        .Append(title).Append(' ')
        //        .Append(firstName).Append(' ')
        //        .Append(middleName).Append(' ')
        //        .Append(lastName).ToString();
        //}

        //[Benchmark]
        //public string StringBuilderExact24() {
        //    var stringBuilder =
        //        new StringBuilder(24);

        //    return stringBuilder
        //        .Append(title).Append(' ')
        //        .Append(firstName).Append(' ')
        //        .Append(middleName).Append(' ')
        //        .Append(lastName).ToString();
        //}

        //[Benchmark]
        //public string StringBuilderEstimate100() {
        //    var stringBuilder =
        //        new StringBuilder(100);

        //    return stringBuilder
        //        .Append(title).Append(' ')
        //        .Append(firstName).Append(' ')
        //        .Append(middleName).Append(' ')
        //        .Append(lastName).ToString();
        //}

        //[Benchmark]
        //public string StringPlus() {
        //    return title + ' ' + firstName + ' ' + middleName + ' ' + lastName;
        //}

        //[Benchmark]
        //public string StringFormat() {
        //    return string.Format("{0} {1} {2} {3}", title, firstName, middleName, lastName);
        //}

        [Benchmark]
        public string StringInterpolation() {
            return $"{title} {firstName} {middleName} {lastName}";
        }

        [Benchmark]
        public string StringJoin() {
            return string.Join(' ', title, firstName, middleName, lastName);
        }

        [Benchmark]
        public string StringConcat() {
            return string.Concat(new String[] { title, " ", firstName, " ", middleName, " ", lastName });
        }

        [Benchmark]
        public string StringCreate() {
            return string.Create(length: title.Length + firstName.Length + middleName.Length + lastName.Length + 3, state: (title, firstName, middleName, lastName), action: (span, state) => {
                state.title.CopyTo(span);
                span[title.Length] = ' ';
                span = span.Slice(title.Length + 1);
                state.firstName.CopyTo(span);
                span[firstName.Length] = ' ';
                span = span.Slice(firstName.Length + 1);
                state.middleName.CopyTo(span);
                span[middleName.Length] = ' ';
                span = span.Slice(middleName.Length + 1);
                state.lastName.CopyTo(span);
            });
        }
    }
}