using System;

using System.Diagnostics;

​

namespace NetPerformanceTest

{

    class Program

    {

        const int ITEMS_COUNT = 100000;

        static void Main(string[] args)

        {

            Stopwatch stopwatch = new Stopwatch();

            stopwatch.Start();

            Class[] classes = new Class[ITEMS_COUNT];

            for (int i = 0; i < classes.Length; i++)

                classes[i] = new Class();

            double classMs = stopwatch.ElapsedTicks * 1000 / (double)Stopwatch.Frequency;

            stopwatch.Restart();

            Struct[] structs = new Struct[ITEMS_COUNT];

            for (int i = 0; i < structs.Length; i++)

                structs[i] = new Struct();

            double structMs = stopwatch.ElapsedTicks * 1000 / (double)Stopwatch.Frequency;

            stopwatch.Stop();

            Console.WriteLine($"class = {classMs}; struct = {structMs}");

            Console.ReadKey(true);

        }

    }

​

    public class Class

    {

        public int X, Y;

        public string Z;

    }

    public struct Struct

    {

        public int X, Y;

        public string Z;

    }

}

​