Benchmark of the costs of different ways of creating GUIDs

GuidCtorBenchmark.cs

// From https://twitter.com/aarnott/status/701653964823990273
public class Framework_Guid
{
    [Benchmark(Baseline = true)]
    public Guid CtorWithHexValues()
    {
        // creates a Guid that corresponds to "12345678-000b-000c-0001-020304050607".
        return new Guid(0x12345678, 0xb, 0xc, 0, 1, 2, 3, 4, 5, 6, 7);
    }

    [Benchmark]
    public Guid CtorWithString()
    {
        return new Guid("{12345678-000b-000c-0001-020304050607}");
    }
}

I'm not familiar with [Benchmark] attributes. What do I need to run them?

Sorry, I wasn't clear, you need to use BenchmarkDotNet, see https://github.com/perfDotNet/BenchmarkDotNet/ and https://www.nuget.org/packages/BenchmarkDotNet/

Cool, thanks. And I see you mentioned it in your Tweet. Sorry I missed that.