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Testing fetching strings via switch, dictionary and enum attribute
Raw
ConsoleApp0.csproj
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>netcoreapp2.2</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="BenchmarkDotNet" Version="0.11.5" />
</ItemGroup>
</Project>
Raw
Program.cs
using System;
using System.Linq;
using System.Collections.Generic;
using System.ComponentModel;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Jobs;
namespace ConsoleApp0
{
[MemoryDiagnoser]
public class Program
{
private readonly string[] PrecomputedDisplayNameAttributeValues = PrecomputeDisplayNameAttributeValues();
private readonly Dictionary<int, string> dict = Enumerable.Range(1, 300).ToDictionary(i => i, i => i.ToString("x"));
private readonly int[] intsToCheck = Enumerable.Range(1, 300).ToArray();
private readonly ArbitraryValues[] valsToCheck = Enumerable.Range(1, 300).Select(i => Enum.Parse<ArbitraryValues>(HumanFriendlyInteger.IntegerToWritten(i))).ToArray();
static int Main()
{
// test that all results are identical.
var program = new Program();
var lst1 = program.TestUsingPrecomputedDisplayNameAttributeValues();
var lst2 = program.TestUsingDict();
var lst3 = program.TestUsingSwitch();
var lst4 = program.TestUsingDisplayNameAttributeOnTheFly();
if (!(lst1.SequenceEqual(lst2) &&
lst1.SequenceEqual(lst3) &&
lst1.SequenceEqual(lst4)))
{
Console.Error.WriteLine("Broken.");
return 1;
}
BenchmarkRunner.Run<Program>(
ManualConfig.Create(
DefaultConfig.Instance.With(
Job.Default.WithGcServer(true))));
return 0;
}
[Benchmark(Baseline = true)]
public string[] TestUsingPrecomputedDisplayNameAttributeValues()
{
return Array.ConvertAll(valsToCheck, val => PrecomputedDisplayNameAttributeValues[(int)val]);
}
[Benchmark]
public string[] TestUsingDict()
{
return Array.ConvertAll(intsToCheck, FindIntInDict);
}
[Benchmark]
public string[] TestUsingSwitch()
{
return Array.ConvertAll(intsToCheck, FindViaSwitch);
}
[Benchmark]
public string[] TestUsingDisplayNameAttributeOnTheFly()
{
return Array.ConvertAll(valsToCheck, FindViaDisplayNameAttribute);
}
private string FindIntInDict(int i)
{
return dict.TryGetValue(i, out string val)
? val
: throw new ArgumentException($"No such key: {i}");
}
private static string FindViaSwitch(int i)
{
switch (i)
{
case 1:
return "1";
case 2:
return "2";
case 3:
return "3";
case 4:
return "4";
case 5:
return "5";
case 6:
return "6";
case 7:
return "7";
case 8:
return "8";
case 9:
return "9";
case 10:
return "a";
case 11:
return "b";
case 12:
return "c";
case 13:
return "d";
case 14:
return "e";
case 15:
return "f";
case 16:
return "10";
case 17:
return "11";
case 18:
return "12";
case 19:
return "13";
case 20:
return "14";
case 21:
return "15";
case 22:
return "16";
case 23:
return "17";
case 24:
return "18";
case 25:
return "19";
case 26:
return "1a";
case 27:
return "1b";
case 28:
return "1c";
case 29:
return "1d";
case 30:
return "1e";
case 31:
return "1f";
case 32:
return "20";
case 33:
return "21";
case 34:
return "22";
case 35:
return "23";
case 36:
return "24";
case 37:
return "25";
case 38:
return "26";
case 39:
return "27";
case 40:
return "28";
case 41:
return "29";
case 42:
return "2a";
case 43:
return "2b";
case 44:
return "2c";
case 45:
return "2d";
case 46:
return "2e";
case 47:
return "2f";
case 48:
return "30";
case 49:
return "31";
case 50:
return "32";
case 51:
return "33";
case 52:
return "34";
case 53:
return "35";
case 54:
return "36";
case 55:
return "37";
case 56:
return "38";
case 57:
return "39";
case 58:
return "3a";
case 59:
return "3b";
case 60:
return "3c";
case 61:
return "3d";
case 62:
return "3e";
case 63:
return "3f";
case 64:
return "40";
case 65:
return "41";
case 66:
return "42";
case 67:
return "43";
case 68:
return "44";
case 69:
return "45";
case 70:
return "46";
case 71:
return "47";
case 72:
return "48";
case 73:
return "49";
case 74:
return "4a";
case 75:
return "4b";
case 76:
return "4c";
case 77:
return "4d";
case 78:
return "4e";
case 79:
return "4f";
case 80:
return "50";
case 81:
return "51";
case 82:
return "52";
case 83:
return "53";
case 84:
return "54";
case 85:
return "55";
case 86:
return "56";
case 87:
return "57";
case 88:
return "58";
case 89:
return "59";
case 90:
return "5a";
case 91:
return "5b";
case 92:
return "5c";
case 93:
return "5d";
case 94:
return "5e";
case 95:
return "5f";
case 96:
return "60";
case 97:
return "61";
case 98:
return "62";
case 99:
return "63";
case 100:
return "64";
case 101:
return "65";
case 102:
return "66";
case 103:
return "67";
case 104:
return "68";
case 105:
return "69";
case 106:
return "6a";
case 107:
return "6b";
case 108:
return "6c";
case 109:
return "6d";
case 110:
return "6e";
case 111:
return "6f";
case 112:
return "70";
case 113:
return "71";
case 114:
return "72";
case 115:
return "73";
case 116:
return "74";
case 117:
return "75";
case 118:
return "76";
case 119:
return "77";
case 120:
return "78";
case 121:
return "79";
case 122:
return "7a";
case 123:
return "7b";
case 124:
return "7c";
case 125:
return "7d";
case 126:
return "7e";
case 127:
return "7f";
case 128:
return "80";
case 129:
return "81";
case 130:
return "82";
case 131:
return "83";
case 132:
return "84";
case 133:
return "85";
case 134:
return "86";
case 135:
return "87";
case 136:
return "88";
case 137:
return "89";
case 138:
return "8a";
case 139:
return "8b";
case 140:
return "8c";
case 141:
return "8d";
case 142:
return "8e";
case 143:
return "8f";
case 144:
return "90";
case 145:
return "91";
case 146:
return "92";
case 147:
return "93";
case 148:
return "94";
case 149:
return "95";
case 150:
return "96";
case 151:
return "97";
case 152:
return "98";
case 153:
return "99";
case 154:
return "9a";
case 155:
return "9b";
case 156:
return "9c";
case 157:
return "9d";
case 158:
return "9e";
case 159:
return "9f";
case 160:
return "a0";
case 161:
return "a1";
case 162:
return "a2";
case 163:
return "a3";
case 164:
return "a4";
case 165:
return "a5";
case 166:
return "a6";
case 167:
return "a7";
case 168:
return "a8";
case 169:
return "a9";
case 170:
return "aa";
case 171:
return "ab";
case 172:
return "ac";
case 173:
return "ad";
case 174:
return "ae";
case 175:
return "af";
case 176:
return "b0";
case 177:
return "b1";
case 178:
return "b2";
case 179:
return "b3";
case 180:
return "b4";
case 181:
return "b5";
case 182:
return "b6";
case 183:
return "b7";
case 184:
return "b8";
case 185:
return "b9";
case 186:
return "ba";
case 187:
return "bb";
case 188:
return "bc";
case 189:
return "bd";
case 190:
return "be";
case 191:
return "bf";
case 192:
return "c0";
case 193:
return "c1";
case 194:
return "c2";
case 195:
return "c3";
case 196:
return "c4";
case 197:
return "c5";
case 198:
return "c6";
case 199:
return "c7";
case 200:
return "c8";
case 201:
return "c9";
case 202:
return "ca";
case 203:
return "cb";
case 204:
return "cc";
case 205:
return "cd";
case 206:
return "ce";
case 207:
return "cf";
case 208:
return "d0";
case 209:
return "d1";
case 210:
return "d2";
case 211:
return "d3";
case 212:
return "d4";
case 213:
return "d5";
case 214:
return "d6";
case 215:
return "d7";
case 216:
return "d8";
case 217:
return "d9";
case 218:
return "da";
case 219:
return "db";
case 220:
return "dc";
case 221:
return "dd";
case 222:
return "de";
case 223:
return "df";
case 224:
return "e0";
case 225:
return "e1";
case 226:
return "e2";
case 227:
return "e3";
case 228:
return "e4";
case 229:
return "e5";
case 230:
return "e6";
case 231:
return "e7";
case 232:
return "e8";
case 233:
return "e9";
case 234:
return "ea";
case 235:
return "eb";
case 236:
return "ec";
case 237:
return "ed";
case 238:
return "ee";
case 239:
return "ef";
case 240:
return "f0";
case 241:
return "f1";
case 242:
return "f2";
case 243:
return "f3";
case 244:
return "f4";
case 245:
return "f5";
case 246:
return "f6";
case 247:
return "f7";
case 248:
return "f8";
case 249:
return "f9";
case 250:
return "fa";
case 251:
return "fb";
case 252:
return "fc";
case 253:
return "fd";
case 254:
return "fe";
case 255:
return "ff";
case 256:
return "100";
case 257:
return "101";
case 258:
return "102";
case 259:
return "103";
case 260:
return "104";
case 261:
return "105";
case 262:
return "106";
case 263:
return "107";
case 264:
return "108";
case 265:
return "109";
case 266:
return "10a";
case 267:
return "10b";
case 268:
return "10c";
case 269:
return "10d";
case 270:
return "10e";
case 271:
return "10f";
case 272:
return "110";
case 273:
return "111";
case 274:
return "112";
case 275:
return "113";
case 276:
return "114";
case 277:
return "115";
case 278:
return "116";
case 279:
return "117";
case 280:
return "118";
case 281:
return "119";
case 282:
return "11a";
case 283:
return "11b";
case 284:
return "11c";
case 285:
return "11d";
case 286:
return "11e";
case 287:
return "11f";
case 288:
return "120";
case 289:
return "121";
case 290:
return "122";
case 291:
return "123";
case 292:
return "124";
case 293:
return "125";
case 294:
return "126";
case 295:
return "127";
case 296:
return "128";
case 297:
return "129";
case 298:
return "12a";
case 299:
return "12b";
case 300:
return "12c";
default:
throw new ArgumentException($"No value defined for {i}");
}
}
private static string[] PrecomputeDisplayNameAttributeValues()
{
var definedValues = (ArbitraryValues[])Enum.GetValues(typeof(ArbitraryValues));
int max = definedValues.Max(val => (int)val);
string[] result = new string[max + 1];
foreach (var val in definedValues)
{
result[(int)val] = FindViaDisplayNameAttribute(val);
}
return result;
}
private static string FindViaDisplayNameAttribute(ArbitraryValues i)
{
var type = typeof(ArbitraryValues);
var memInfo = type.GetMember(i.ToString());
if (memInfo.Length == 0)
{
throw new ArgumentException($"No value defined for {i}");
}
var attributes = memInfo[0].GetCustomAttributes(typeof(DisplayNameAttribute), false);
if (attributes.Length == 0)
{
throw new ArgumentException($"No value defined for {i}");
}
return ((DisplayNameAttribute)attributes[0]).DisplayName;
}
}
public enum ArbitraryValues
{
[DisplayName("1")]
One,
[DisplayName("2")]
Two,
[DisplayName("3")]
Three,
[DisplayName("4")]
Four,
[DisplayName("5")]
Five,
[DisplayName("6")]
Six,
[DisplayName("7")]
Seven,
[DisplayName("8")]
Eight,
[DisplayName("9")]
Nine,
[DisplayName("a")]
Ten,
[DisplayName("b")]
Eleven,
[DisplayName("c")]
Twelve,
[DisplayName("d")]
Thirteen,
[DisplayName("e")]
Fourteen,
[DisplayName("f")]
Fifteen,
[DisplayName("10")]
Sixteen,
[DisplayName("11")]
Seventeen,
[DisplayName("12")]
Eighteen,
[DisplayName("13")]
Nineteen,
[DisplayName("14")]
Twenty,
[DisplayName("15")]
TwentyOne,
[DisplayName("16")]
TwentyTwo,
[DisplayName("17")]
TwentyThree,
[DisplayName("18")]
TwentyFour,
[DisplayName("19")]
TwentyFive,
[DisplayName("1a")]
TwentySix,
[DisplayName("1b")]
TwentySeven,
[DisplayName("1c")]
TwentyEight,
[DisplayName("1d")]
TwentyNine,
[DisplayName("1e")]
Thirty,
[DisplayName("1f")]
ThirtyOne,
[DisplayName("20")]
ThirtyTwo,
[DisplayName("21")]
ThirtyThree,
[DisplayName("22")]
ThirtyFour,
[DisplayName("23")]
ThirtyFive,
[DisplayName("24")]
ThirtySix,
[DisplayName("25")]
ThirtySeven,
[DisplayName("26")]
ThirtyEight,
[DisplayName("27")]
ThirtyNine,
[DisplayName("28")]
Forty,
[DisplayName("29")]
FortyOne,
[DisplayName("2a")]
FortyTwo,
[DisplayName("2b")]
FortyThree,
[DisplayName("2c")]
FortyFour,
[DisplayName("2d")]
FortyFive,
[DisplayName("2e")]
FortySix,
[DisplayName("2f")]
FortySeven,
[DisplayName("30")]
FortyEight,
[DisplayName("31")]
FortyNine,
[DisplayName("32")]
Fifty,
[DisplayName("33")]
FiftyOne,
[DisplayName("34")]
FiftyTwo,
[DisplayName("35")]
FiftyThree,
[DisplayName("36")]
FiftyFour,
[DisplayName("37")]
FiftyFive,
[DisplayName("38")]
FiftySix,
[DisplayName("39")]
FiftySeven,
[DisplayName("3a")]
FiftyEight,
[DisplayName("3b")]
FiftyNine,
[DisplayName("3c")]
Sixty,
[DisplayName("3d")]
SixtyOne,
[DisplayName("3e")]
SixtyTwo,
[DisplayName("3f")]
SixtyThree,
[DisplayName("40")]
SixtyFour,
[DisplayName("41")]
SixtyFive,
[DisplayName("42")]
SixtySix,
[DisplayName("43")]
SixtySeven,
[DisplayName("44")]
SixtyEight,
[DisplayName("45")]
SixtyNine,
[DisplayName("46")]
Seventy,
[DisplayName("47")]
SeventyOne,
[DisplayName("48")]
SeventyTwo,
[DisplayName("49")]
SeventyThree,
[DisplayName("4a")]
SeventyFour,
[DisplayName("4b")]
SeventyFive,
[DisplayName("4c")]
SeventySix,
[DisplayName("4d")]
SeventySeven,
[DisplayName("4e")]
SeventyEight,
[DisplayName("4f")]
SeventyNine,
[DisplayName("50")]
Eighty,
[DisplayName("51")]
EightyOne,
[DisplayName("52")]
EightyTwo,
[DisplayName("53")]
EightyThree,
[DisplayName("54")]
EightyFour,
[DisplayName("55")]
EightyFive,
[DisplayName("56")]
EightySix,
[DisplayName("57")]
EightySeven,
[DisplayName("58")]
EightyEight,
[DisplayName("59")]
EightyNine,
[DisplayName("5a")]
Ninety,
[DisplayName("5b")]
NinetyOne,
[DisplayName("5c")]
NinetyTwo,
[DisplayName("5d")]
NinetyThree,
[DisplayName("5e")]
NinetyFour,
[DisplayName("5f")]
NinetyFive,
[DisplayName("60")]
NinetySix,
[DisplayName("61")]
NinetySeven,
[DisplayName("62")]
NinetyEight,
[DisplayName("63")]
NinetyNine,
[DisplayName("64")]
OneHundred,
[DisplayName("65")]
OneHundredOne,
[DisplayName("66")]
OneHundredTwo,
[DisplayName("67")]
OneHundredThree,
[DisplayName("68")]
OneHundredFour,
[DisplayName("69")]
OneHundredFive,
[DisplayName("6a")]
OneHundredSix,
[DisplayName("6b")]
OneHundredSeven,
[DisplayName("6c")]
OneHundredEight,
[DisplayName("6d")]
OneHundredNine,
[DisplayName("6e")]
OneHundredTen,
[DisplayName("6f")]
OneHundredEleven,
[DisplayName("70")]
OneHundredTwelve,
[DisplayName("71")]
OneHundredThirteen,
[DisplayName("72")]
OneHundredFourteen,
[DisplayName("73")]
OneHundredFifteen,
[DisplayName("74")]
OneHundredSixteen,
[DisplayName("75")]
OneHundredSeventeen,
[DisplayName("76")]
OneHundredEighteen,
[DisplayName("77")]
OneHundredNineteen,
[DisplayName("78")]
OneHundredTwenty,
[DisplayName("79")]
OneHundredTwentyOne,
[DisplayName("7a")]
OneHundredTwentyTwo,
[DisplayName("7b")]
OneHundredTwentyThree,
[DisplayName("7c")]
OneHundredTwentyFour,
[DisplayName("7d")]
OneHundredTwentyFive,
[DisplayName("7e")]
OneHundredTwentySix,
[DisplayName("7f")]
OneHundredTwentySeven,
[DisplayName("80")]
OneHundredTwentyEight,
[DisplayName("81")]
OneHundredTwentyNine,
[DisplayName("82")]
OneHundredThirty,
[DisplayName("83")]
OneHundredThirtyOne,
[DisplayName("84")]
OneHundredThirtyTwo,
[DisplayName("85")]
OneHundredThirtyThree,
[DisplayName("86")]
OneHundredThirtyFour,
[DisplayName("87")]
OneHundredThirtyFive,
[DisplayName("88")]
OneHundredThirtySix,
[DisplayName("89")]
OneHundredThirtySeven,
[DisplayName("8a")]
OneHundredThirtyEight,
[DisplayName("8b")]
OneHundredThirtyNine,
[DisplayName("8c")]
OneHundredForty,
[DisplayName("8d")]
OneHundredFortyOne,
[DisplayName("8e")]
OneHundredFortyTwo,
[DisplayName("8f")]
OneHundredFortyThree,
[DisplayName("90")]
OneHundredFortyFour,
[DisplayName("91")]
OneHundredFortyFive,
[DisplayName("92")]
OneHundredFortySix,
[DisplayName("93")]
OneHundredFortySeven,
[DisplayName("94")]
OneHundredFortyEight,
[DisplayName("95")]
OneHundredFortyNine,
[DisplayName("96")]
OneHundredFifty,
[DisplayName("97")]
OneHundredFiftyOne,
[DisplayName("98")]
OneHundredFiftyTwo,
[DisplayName("99")]
OneHundredFiftyThree,
[DisplayName("9a")]
OneHundredFiftyFour,
[DisplayName("9b")]
OneHundredFiftyFive,
[DisplayName("9c")]
OneHundredFiftySix,
[DisplayName("9d")]
OneHundredFiftySeven,
[DisplayName("9e")]
OneHundredFiftyEight,
[DisplayName("9f")]
OneHundredFiftyNine,
[DisplayName("a0")]
OneHundredSixty,
[DisplayName("a1")]
OneHundredSixtyOne,
[DisplayName("a2")]
OneHundredSixtyTwo,
[DisplayName("a3")]
OneHundredSixtyThree,
[DisplayName("a4")]
OneHundredSixtyFour,
[DisplayName("a5")]
OneHundredSixtyFive,
[DisplayName("a6")]
OneHundredSixtySix,
[DisplayName("a7")]
OneHundredSixtySeven,
[DisplayName("a8")]
OneHundredSixtyEight,
[DisplayName("a9")]
OneHundredSixtyNine,
[DisplayName("aa")]
OneHundredSeventy,
[DisplayName("ab")]
OneHundredSeventyOne,
[DisplayName("ac")]
OneHundredSeventyTwo,
[DisplayName("ad")]
OneHundredSeventyThree,
[DisplayName("ae")]
OneHundredSeventyFour,
[DisplayName("af")]
OneHundredSeventyFive,
[DisplayName("b0")]
OneHundredSeventySix,
[DisplayName("b1")]
OneHundredSeventySeven,
[DisplayName("b2")]
OneHundredSeventyEight,
[DisplayName("b3")]
OneHundredSeventyNine,
[DisplayName("b4")]
OneHundredEighty,
[DisplayName("b5")]
OneHundredEightyOne,
[DisplayName("b6")]
OneHundredEightyTwo,
[DisplayName("b7")]
OneHundredEightyThree,
[DisplayName("b8")]
OneHundredEightyFour,
[DisplayName("b9")]
OneHundredEightyFive,
[DisplayName("ba")]
OneHundredEightySix,
[DisplayName("bb")]
OneHundredEightySeven,
[DisplayName("bc")]
OneHundredEightyEight,
[DisplayName("bd")]
OneHundredEightyNine,
[DisplayName("be")]
OneHundredNinety,
[DisplayName("bf")]
OneHundredNinetyOne,
[DisplayName("c0")]
OneHundredNinetyTwo,
[DisplayName("c1")]
OneHundredNinetyThree,
[DisplayName("c2")]
OneHundredNinetyFour,
[DisplayName("c3")]
OneHundredNinetyFive,
[DisplayName("c4")]
OneHundredNinetySix,
[DisplayName("c5")]
OneHundredNinetySeven,
[DisplayName("c6")]
OneHundredNinetyEight,
[DisplayName("c7")]
OneHundredNinetyNine,
[DisplayName("c8")]
TwoHundred,
[DisplayName("c9")]
TwoHundredOne,
[DisplayName("ca")]
TwoHundredTwo,
[DisplayName("cb")]
TwoHundredThree,
[DisplayName("cc")]
TwoHundredFour,
[DisplayName("cd")]
TwoHundredFive,
[DisplayName("ce")]
TwoHundredSix,
[DisplayName("cf")]
TwoHundredSeven,
[DisplayName("d0")]
TwoHundredEight,
[DisplayName("d1")]
TwoHundredNine,
[DisplayName("d2")]
TwoHundredTen,
[DisplayName("d3")]
TwoHundredEleven,
[DisplayName("d4")]
TwoHundredTwelve,
[DisplayName("d5")]
TwoHundredThirteen,
[DisplayName("d6")]
TwoHundredFourteen,
[DisplayName("d7")]
TwoHundredFifteen,
[DisplayName("d8")]
TwoHundredSixteen,
[DisplayName("d9")]
TwoHundredSeventeen,
[DisplayName("da")]
TwoHundredEighteen,
[DisplayName("db")]
TwoHundredNineteen,
[DisplayName("dc")]
TwoHundredTwenty,
[DisplayName("dd")]
TwoHundredTwentyOne,
[DisplayName("de")]
TwoHundredTwentyTwo,
[DisplayName("df")]
TwoHundredTwentyThree,
[DisplayName("e0")]
TwoHundredTwentyFour,
[DisplayName("e1")]
TwoHundredTwentyFive,
[DisplayName("e2")]
TwoHundredTwentySix,
[DisplayName("e3")]
TwoHundredTwentySeven,
[DisplayName("e4")]
TwoHundredTwentyEight,
[DisplayName("e5")]
TwoHundredTwentyNine,
[DisplayName("e6")]
TwoHundredThirty,
[DisplayName("e7")]
TwoHundredThirtyOne,
[DisplayName("e8")]
TwoHundredThirtyTwo,
[DisplayName("e9")]
TwoHundredThirtyThree,
[DisplayName("ea")]
TwoHundredThirtyFour,
[DisplayName("eb")]
TwoHundredThirtyFive,
[DisplayName("ec")]
TwoHundredThirtySix,
[DisplayName("ed")]
TwoHundredThirtySeven,
[DisplayName("ee")]
TwoHundredThirtyEight,
[DisplayName("ef")]
TwoHundredThirtyNine,
[DisplayName("f0")]
TwoHundredForty,
[DisplayName("f1")]
TwoHundredFortyOne,
[DisplayName("f2")]
TwoHundredFortyTwo,
[DisplayName("f3")]
TwoHundredFortyThree,
[DisplayName("f4")]
TwoHundredFortyFour,
[DisplayName("f5")]
TwoHundredFortyFive,
[DisplayName("f6")]
TwoHundredFortySix,
[DisplayName("f7")]
TwoHundredFortySeven,
[DisplayName("f8")]
TwoHundredFortyEight,
[DisplayName("f9")]
TwoHundredFortyNine,
[DisplayName("fa")]
TwoHundredFifty,
[DisplayName("fb")]
TwoHundredFiftyOne,
[DisplayName("fc")]
TwoHundredFiftyTwo,
[DisplayName("fd")]
TwoHundredFiftyThree,
[DisplayName("fe")]
TwoHundredFiftyFour,
[DisplayName("ff")]
TwoHundredFiftyFive,
[DisplayName("100")]
TwoHundredFiftySix,
[DisplayName("101")]
TwoHundredFiftySeven,
[DisplayName("102")]
TwoHundredFiftyEight,
[DisplayName("103")]
TwoHundredFiftyNine,
[DisplayName("104")]
TwoHundredSixty,
[DisplayName("105")]
TwoHundredSixtyOne,
[DisplayName("106")]
TwoHundredSixtyTwo,
[DisplayName("107")]
TwoHundredSixtyThree,
[DisplayName("108")]
TwoHundredSixtyFour,
[DisplayName("109")]
TwoHundredSixtyFive,
[DisplayName("10a")]
TwoHundredSixtySix,
[DisplayName("10b")]
TwoHundredSixtySeven,
[DisplayName("10c")]
TwoHundredSixtyEight,
[DisplayName("10d")]
TwoHundredSixtyNine,
[DisplayName("10e")]
TwoHundredSeventy,
[DisplayName("10f")]
TwoHundredSeventyOne,
[DisplayName("110")]
TwoHundredSeventyTwo,
[DisplayName("111")]
TwoHundredSeventyThree,
[DisplayName("112")]
TwoHundredSeventyFour,
[DisplayName("113")]
TwoHundredSeventyFive,
[DisplayName("114")]
TwoHundredSeventySix,
[DisplayName("115")]
TwoHundredSeventySeven,
[DisplayName("116")]
TwoHundredSeventyEight,
[DisplayName("117")]
TwoHundredSeventyNine,
[DisplayName("118")]
TwoHundredEighty,
[DisplayName("119")]
TwoHundredEightyOne,
[DisplayName("11a")]
TwoHundredEightyTwo,
[DisplayName("11b")]
TwoHundredEightyThree,
[DisplayName("11c")]
TwoHundredEightyFour,
[DisplayName("11d")]
TwoHundredEightyFive,
[DisplayName("11e")]
TwoHundredEightySix,
[DisplayName("11f")]
TwoHundredEightySeven,
[DisplayName("120")]
TwoHundredEightyEight,
[DisplayName("121")]
TwoHundredEightyNine,
[DisplayName("122")]
TwoHundredNinety,
[DisplayName("123")]
TwoHundredNinetyOne,
[DisplayName("124")]
TwoHundredNinetyTwo,
[DisplayName("125")]
TwoHundredNinetyThree,
[DisplayName("126")]
TwoHundredNinetyFour,
[DisplayName("127")]
TwoHundredNinetyFive,
[DisplayName("128")]
TwoHundredNinetySix,
[DisplayName("129")]
TwoHundredNinetySeven,
[DisplayName("12a")]
TwoHundredNinetyEight,
[DisplayName("12b")]
TwoHundredNinetyNine,
[DisplayName("12c")]
ThreeHundred
}
public static class HumanFriendlyInteger
{
static string[] ones = new string[] { "", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" };
static string[] teens = new string[] { "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" };
static string[] tens = new string[] { "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" };
static string[] thousandsGroups = { "", "Thousand", "Million", "Billion" };
private static string FriendlyInteger(int n, string leftDigits, int thousands)
{
if (n == 0)
{
return leftDigits;
}
string friendlyInt = leftDigits;
if (friendlyInt.Length > 0)
{
friendlyInt += "";
}
if (n < 10)
{
friendlyInt += ones[n];
}
else if (n < 20)
{
friendlyInt += teens[n - 10];
}
else if (n < 100)
{
friendlyInt += FriendlyInteger(n % 10, tens[n / 10 - 2], 0);
}
else if (n < 1000)
{
friendlyInt += FriendlyInteger(n % 100, (ones[n / 100] + "Hundred"), 0);
}
else
{
friendlyInt += FriendlyInteger(n % 1000, FriendlyInteger(n / 1000, "", thousands + 1), 0);
if (n % 1000 == 0)
{
return friendlyInt;
}
}
return friendlyInt + thousandsGroups[thousands];
}
public static string IntegerToWritten(int n)
{
if (n == 0)
{
return "Zero";
}
else if (n < 0)
{
return "Negative" + IntegerToWritten(-n);
}
return FriendlyInteger(n, "", 0);
}
}
}
Raw
Results.md 
BenchmarkDotNet=v0.11.5, OS=Windows 10.0.17134.753 (1803/April2018Update/Redstone4)
Intel Core i7-6850K CPU 3.60GHz (Skylake), 1 CPU, 12 logical and 6 physical cores
Frequency=3515622 Hz, Resolution=284.4447 ns, Timer=TSC
.NET Core SDK=3.0.100-preview4-011223
  [Host]     : .NET Core 2.2.3 (CoreCLR 4.6.27414.05, CoreFX 4.6.27414.05), 64bit RyuJIT
  Job-DTPJCP : .NET Core 2.2.3 (CoreCLR 4.6.27414.05, CoreFX 4.6.27414.05), 64bit RyuJIT

Server=True
Method Mean Error StdDev Ratio RatioSD Gen 0 Gen 1 Gen 2 Allocated
TestUsingPrecomputedDisplayNameAttributeValues 1.312 us 0.0054 us 0.0050 us 1.00 0.00 0.0114 - - 2.43 KB
TestUsingDict 3.768 us 0.0016 us 0.0014 us 2.87 0.01 0.0076 - - 2.43 KB
TestUsingSwitch 3.498 us 0.0091 us 0.0081 us 2.67 0.01 0.0076 - - 2.43 KB
TestUsingDisplayNameAttributeOnTheFly 664.442 us 1.2564 us 1.1753 us 506.32 2.32 - - - 85.22 KB
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