ListPerformanceTest001

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ListPerformanceTest001
{
    class Program
    {
        static void Main(string[] args)
        {
            // 3D粒子数
            int num = 100000;
            // 繰り返し回数
            int loop = 100;

            Random rand = new Random(1234567);

            List<CoordinateClass> list1 = new List<CoordinateClass>();
            for (int i = 0; i < num; i++)
                list1.Add(new CoordinateClass()
                {
                    X = rand.NextDouble(),
                    Y = rand.NextDouble(),
                    Z = rand.NextDouble(),
                });
            JobItem job1 = new JobItem()
            {
                Message = "List<class>",
                Action = () =>
                {
                    List<CoordinateClass> copiedList = new List<CoordinateClass>();
                    foreach (var item in list1)
                        copiedList.Add(item.Clone());

                    // エラー
                    //List<CoordinateClass> copiedList = new List<CoordinateClass>(list1.Count);
                    //for (int i = 0; i < list1.Count; i++)
                    //    copiedList[i] = list1[i].Clone();
                },
            };


            List<CoordinateStruct> list2 = new List<CoordinateStruct>();
            for (int i = 0; i < num; i++)
                list2.Add(new CoordinateStruct()
                {
                    X = rand.NextDouble(),
                    Y = rand.NextDouble(),
                    Z = rand.NextDouble(),
                });
            JobItem job2 = new JobItem()
            {
                Message = "List<struct>",
                Action = () =>
                {
                    List<CoordinateStruct> copiedList = new List<CoordinateStruct>(list2);
                },
            };

            CoordinateClass[] list3 = new CoordinateClass[num];
            for (int i = 0; i < num; i++)
                list3[i] = new CoordinateClass()
                {
                    X = rand.NextDouble(),
                    Y = rand.NextDouble(),
                    Z = rand.NextDouble(),
                };
            JobItem job3 = new JobItem()
            {
                Message = "class[]",
                Action = () =>
                {
                    CoordinateClass[] copiedList = new CoordinateClass[list3.Length];
                    for (int i = 0; i < copiedList.Length; i++)
                        copiedList[i] = list3[i].Clone();
                },
            };


            CoordinateStruct[] list4 = new CoordinateStruct[num];
            for (int i = 0; i < num; i++)
                list4[i] = new CoordinateStruct()
                {
                    X = rand.NextDouble(),
                    Y = rand.NextDouble(),
                    Z = rand.NextDouble(),
                };
            JobItem job4 = new JobItem()
            {
                Message = "struct[]",
                Action = () =>
                {
                    CoordinateStruct[] copiedList = new CoordinateStruct[list4.Length];
                    list4.CopyTo(copiedList, 0);
                },
            };

            List<JobItem> jobList = new List<JobItem>()
            {
                job1,
                job2,
                job3,
                job4,
            };

            foreach (var job in jobList)
                Test(job, loop);
        }

        public static void Test(JobItem jobItem, int loop)
        {
            Action action = jobItem.Action;
            Stopwatch sw = new Stopwatch();

            for (int i = 0; i < loop; i++)
            {
                sw.Start();
                action();
                sw.Stop();

                System.Threading.Thread.Sleep(10);
            }

            Console.WriteLine("{0, -20} : {1:F3} msec.", jobItem.Message, (double)sw.ElapsedTicks / ((double)Stopwatch.Frequency * loop) * 1000);
        }
    }

    public class JobItem
    {
        public string Message { get; set; }
        public Action Action { get; set; }
    }

    public class CoordinateClass
    {
        public double X { get; set; }
        public double Y { get; set; }
        public double Z { get; set; }

        public CoordinateClass()
        {
        }

        public CoordinateClass(double x, double y, double z)
        {
            this.X = x;
            this.Y = y;
            this.Z = z;
        }

        public CoordinateClass Clone()
        {
            return new CoordinateClass(this.X, this.Y, this.Z);
        }
    }

    public struct CoordinateStruct
    {
        public double X { get; set; }
        public double Y { get; set; }
        public double Z { get; set; }
    }
}