using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;

[MemoryDiagnoser(false)]
public class Program
{
    static void Main(string[] args) => BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args);

    [Benchmark]
    public object[] GetCustomAttributes() => typeof(C).GetCustomAttributes(typeof(MyAttribute), true);
}

[My(Value1 = 1, Value2 = 2)]
class C { }

[AttributeUsage(AttributeTargets.All)]
public class MyAttribute : Attribute
{
    public int Value1 { get; set; }
    public int Value2 { get; set; }
}