TypeChecks.cs

TypeChecks.cs

using BenchmarkDotNet.Attributes;
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using BenchmarkDotNet.Running;


public class Program
{
    static void Main(string[] args)
    {
        BenchmarkSwitcher.FromTypes(new[] { typeof(TypeChecks) }).Run(args);
    }
}

public class BaseClass
{
    [MethodImpl(MethodImplOptions.NoInlining)]
    public virtual void DoWork() { }
}

public class Subclass : BaseClass
{
    [MethodImpl(MethodImplOptions.NoInlining)]
    public override void DoWork() { }
}

public class TypeChecks
{
    private static object BaseClassInstance = new BaseClass();
    private static object SubclassInstance = new Subclass();
    private static object WrongInstance = new Program();

    public IEnumerable<object> TestObjects()
    {
        yield return null;
        yield return BaseClassInstance;
        yield return SubclassInstance;
        yield return WrongInstance;
    }

    [Benchmark]
    [ArgumentsSource(nameof(TestObjects))]
    public bool IsBaseClass(object o) => o is BaseClass;

    [Benchmark]
    [ArgumentsSource(nameof(TestObjects))]
    public void CallDoWork(object o)
    {
        if (o is BaseClass bc)
        {
            bc.DoWork();
        }
    }
}