[No000088]並行迴圈vs普通迴圈

標籤：

using System;using System.Collections.Generic;using System.Threading;using System.Threading.Tasks;namespace Chinese中文排序Sort{    internal class Program    {        private static List<int> Data = new List<int>();        /// <summary>        /// 是否顯示執行過程        /// </summary>        public static bool ShowProcessExecution = true;        /// <summary>        /// 這是普通迴圈for        /// </summary>        private static void Demo1NormaFor()        {            List<int> data = Program.Data;            DateTime dt1 = DateTime.Now;            for (int i = 0; i < data.Count; i++)            {                Thread.Sleep(500);                if (ShowProcessExecution)                    Console.WriteLine(data[i]);            }            DateTime dt2 = DateTime.Now;            Console.WriteLine("普通迴圈For運行時間長度：{0}毫秒。", (dt2 - dt1).TotalMilliseconds);        }        /// <summary>        /// 這是普通迴圈foreach        /// </summary>        private static void Demo2NormalForeach()        {            List<int> data = Program.Data;            DateTime dt1 = DateTime.Now;            foreach (var i in data)            {                Thread.Sleep(500);                if (ShowProcessExecution)                    Console.WriteLine(i);            }            DateTime dt2 = DateTime.Now;            Console.WriteLine("普通迴圈Foreach運行時間長度：{0}毫秒。", (dt2 - dt1).TotalMilliseconds);        }        /// <summary>        /// 這是並行計算For        /// </summary>        private static void Demo3ParallelFor()        {            List<int> data = Program.Data;            DateTime dt1 = DateTime.Now;            Parallel.For(0, data.Count, (i) =>            {                Thread.Sleep(500);                if (ShowProcessExecution)                    Console.WriteLine(data[i]);            });            DateTime dt2 = DateTime.Now;            Console.WriteLine("並行運算For運行時間長度：{0}毫秒。", (dt2 - dt1).TotalMilliseconds);        }        /// <summary>        /// 這是並行計算ForEach        /// </summary>        private static void Demo4ParallelForeach()        {            List<int> data = Program.Data;            DateTime dt1 = DateTime.Now;            Parallel.ForEach(data, (i) =>            {                Thread.Sleep(500);                if (ShowProcessExecution)                    Console.WriteLine(i);            });            DateTime dt2 = DateTime.Now;            Console.WriteLine("並行運算ForEach運行時間長度：{0}毫秒。", (dt2 - dt1).TotalMilliseconds);        }        private static void Main(string[] args)        {            string sTemp = "0123456789";            Console.WriteLine(sTemp.Substring(0, 3));//012            UInt64 uintROWNUM = 0;            UInt64 sInt = ++uintROWNUM;            Console.WriteLine(sInt.ToString());//1            Program.Data = new List<int>();            for (int i = 0; i < 10; i++)            {                Data.Add(i);            }            Demo1NormaFor();//5004.347毫秒。            Demo2NormalForeach();//5003.8115毫秒。            Demo3ParallelFor();//1089.198毫秒。            Demo4ParallelForeach();//1021.5196毫秒。            Console.ReadKey();        }    }}

並行迴圈不適合排序!!

[No000088]並行迴圈vs普通迴圈