Dictionary TryGetValue Benchmark

DictionaryTryGetValue.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFrameworks>net7.0;net6.0;net5.0;netcoreapp3.1;net48;netcoreapp2.1</TargetFrameworks>
    <LangVersion>7.3</LangVersion>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
  </ItemGroup>

</Project>

Program.cs

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

public class Program
{
  public static void Main(string[] args) =>
    BenchmarkSwitcher.FromAssemblies(new[] { typeof(Program).Assembly }).Run(args);
}

public class DictionaryBenchmark
{
  private static readonly Dictionary<string, int> _dictionary = new Dictionary<string, int>();
  private const string KEY_STRING = "abcdefghijklmnopqrstuvwxyz";
  private const int MAX_KEY_LENGTH = 200;
  private const int KEY_LENGTH_INCREMENT = 25;

  [GlobalSetup]
  public void Setup()
  {
    foreach (var key in GetKeyValues())
    {
      _dictionary.Add((string)key, 1);
    }
  }

  [Benchmark]
  [ArgumentsSource(nameof(GetKeyValues))]
  public int TryGetValue(string key) => _dictionary.TryGetValue(key, out var value) ? value : default;

  // https://benchmarkdotnet.org/articles/features/parameterization.html#sample-introargumentssource
  public IEnumerable<object> GetKeyValues()
  {
    var keyString = KEY_STRING;
    while(keyString.Length < MAX_KEY_LENGTH)
    {
      keyString += KEY_STRING;
    }

    for (int i = 1; i <= keyString.Length; i += KEY_LENGTH_INCREMENT)
    {
      yield return keyString.Substring(0, i);
    }
  }
}