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

BenchmarkSwitcher.FromAssembly(typeof(Tests).Assembly).Run(args);

[MemoryDiagnoser(false)]
[HideColumns("Job", "Error", "StdDev", "Median", "RatioSD")]
public partial class Tests
{
    private IEnumerable<MemberInfo> _members;

    [Params(typeof(object), typeof(string))]
    public Type Target { get; set; }

    [GlobalSetup]
    public void Setup() => _members = Target.GetMembers();

    [Benchmark]
    public int OfTypeForEach()
    {
        int sum = 0;
        foreach (MethodInfo member in _members.OfType<MethodInfo>())
        {
            sum += member.Name.Length;
        }
        return sum;
    }

    [Benchmark]
    public int OfTypeCount() => _members.OfType<MethodInfo>().Count();

    [Benchmark]
    public MethodInfo[] OfTypeToArray() => _members.OfType<MethodInfo>().ToArray();

    [Benchmark]
    public List<MethodInfo> OfTypeToList() => _members.OfType<MethodInfo>().ToList();

    [Benchmark]
    public MethodInfo OfTypeFirst() => _members.OfType<MethodInfo>().First();

    [Benchmark]
    public MethodInfo OfTypeLast() => _members.OfType<MethodInfo>().Last();

    [Benchmark]
    public int OfTypeSelectForEach()
    {
        int sum = 0;
        foreach (string name in _members.OfType<MethodInfo>().Select(m => m.Name))
        {
            sum += name.Length;
        }
        return sum;
    }
}