ReflectionSetValueBanchmark.cs

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

public class Program
{
    public static void Main(string[] args)
    {
        BenchmarkRunner.Run(typeof(Program).Assembly);
    }

    public class SetValueBenchmark
    {
        private static readonly TestClass TestClass = new TestClass { StringProperty = "Initial Value", IntProperty = 1, ObjectProperty = new TestClass() };
        
        private static readonly PropertyInfo StringPropertyInfo = typeof(TestClass).GetProperty(nameof(TestClass.StringProperty));
        private static readonly PropertyInfo IntPropertyInfo = typeof(TestClass).GetProperty(nameof(TestClass.IntProperty));
        private static readonly PropertyInfo ObjectPropertyInfo = typeof(TestClass).GetProperty(nameof(TestClass.ObjectProperty));

        [Benchmark]
        public void DirectSet()
        {
            TestClass.StringProperty = "Test String";
            TestClass.IntProperty = 1984;
            TestClass.ObjectProperty = new TestClass();
        }

        [Benchmark]
        public void ReflectionSet()
        {
            StringPropertyInfo.SetValue(TestClass, "Test String 2");
            IntPropertyInfo.SetValue(TestClass, 4891);
            ObjectPropertyInfo.SetValue(TestClass, new TestClass());
        }
    }
}

public class TestClass
{
    public string StringProperty { get; set; }

    public int IntProperty { get; set; }

    public TestClass ObjectProperty { get; set; }
}