A benchmark to test the performance of integer vs string switch statements.

SwitchBenchmarks.cs

using BenchmarkDotNet.Attributes;

namespace AgentMobilityNet.Benchmark;

[MemoryDiagnoser]
public class SwitchBenchmarks
{
    [Params(1,100, 10000)]
    public int Size { get; set; }

    private static readonly string[] _strings = new string[10000];
    private static readonly int[] _ints = new int[10000];

    [GlobalSetup]
    public void Setup()
    {
        for (int i = 0; i < 10000; i++)
        {
            int number = i % 3;
            _strings[i] = number.ToString();
            _ints[i] = number;
        }
    }

    [Benchmark]
    public int Int()
    {
        int sum = 0;
        for (int i = 0; i < Size; i++)
        {
            int number = _ints[i];
            sum += number switch
            {
                0 => 0,
                1 => 1,
                2 => 2,
                _ => throw new Exception()
            };

        }
        return sum;
    }

    [Benchmark]
    public int String()
    {
        int sum = 0;
        for (int i = 0; i < Size; i++)
        {
            sum += _strings[i] switch
            {
                "0" => 0,
                "1" => 1,
                "2" => 2,
                _ => throw new Exception()
            };

        }
        return sum;
    }
    
    [Benchmark]
    public int IntIf()
    {
        int sum = 0;
        for (int i = 0; i < Size; i++)
        {
            int number = _ints[i];
            if (!(number == 0))
            {
                if (!(number == 1))
                {
                    if (!(number == 2))
                    {
                        throw new Exception();
                    }
                    sum += 2;
                }
                else
                {
                    sum += 1;
                }
            }
        }
        return sum;
    }
}    
    
| Method | Size  | Mean           | Error       | StdDev      | Allocated |
|------- |------ |---------------:|------------:|------------:|----------:|
| Int    | 1     |      1.1818 ns |   0.0315 ns |   0.0263 ns |         - |
| IntIf  | 1     |      0.7574 ns |   0.0040 ns |   0.0033 ns |         - |
| String | 1     |      1.3795 ns |   0.0092 ns |   0.0086 ns |         - |
| Record | 1     |      1.4888 ns |   0.0093 ns |   0.0087 ns |         - |
| Int    | 100   |    139.4602 ns |   0.1135 ns |   0.1062 ns |         - |
| IntIf  | 100   |     73.4985 ns |   0.4778 ns |   0.4469 ns |         - |
| String | 100   |    118.0915 ns |   0.6409 ns |   0.5995 ns |         - |
| Record | 100   |    324.7322 ns |   1.3668 ns |   1.2785 ns |         - |
| Int    | 10000 | 15,932.6126 ns |  16.9945 ns |  15.8967 ns |         - |
| IntIf  | 10000 |  6,558.3073 ns |  42.6984 ns |  35.6551 ns |         - |
| String | 10000 | 11,309.7840 ns |  86.6066 ns |  76.7745 ns |         - |
| Record | 10000 | 26,570.9096 ns | 279.0804 ns | 217.8876 ns |         - |