StringDictBench.cs

[MediumRunJob]
[MemoryDiagnoser]
public class StringDictBench
{
	System.Collections.Generic.Dictionary<ReadOnlyMemory<char>, string> mem = new();
	System.Collections.Generic.Dictionary<string, string> str = new();
	string key = "key";

	public StringDictBench()
	{
		mem.Add("e".AsMemory(), "foo");
		str.Add("e", "foo");
	}

	private ReadOnlyMemory<char> GetMemKey() => key.AsMemory(1, 1);
	private ReadOnlySpan<char> GetSpanKey() => key.AsSpan(1, 1);

	[Benchmark]
	public string WithMem()
	{
		if (mem.TryGetValue(GetMemKey(), out var result))
			return result;
		return null;
	}

	[Benchmark]
	public string WithString()
	{
		if (str.TryGetValue(GetSpanKey().ToString(), out var result))
			return result;
		return null;
	}
}