Biegral Blog

C#异步编程
基于任务的异步模式 (TAP)
https://docs.microsoft.com/zh-cn/dotnet/standard/asynchronous-programming-patterns/task-based-asynchronous-pattern-tap

微软官方文档地址
https://docs.microsoft.com/zh-cn/dotnet/standard/parallel-programming/how-to-write-a-simple-parallel-for-loop

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

namespace Parallel_ForEach_Test
{
    class Program
    {
        static void Main(string[] args)
        {
            Stopwatch sw = new Stopwatch();
            List<long> list = new List<long>();
            for (int i = 50; i < 60; i++)
            {
                list.Add(i);
            }
            sw.Start();

            List<double> list1 = new List<double>();
            Parallel.ForEach(list,
            currentElement =>
            {
                double sall2 = 0;
                for (int g = 0; g < 10000000; g++)
                {
                    double x = Convert.ToDouble(1 * currentElement);
                    double y = Convert.ToDouble(2);
                    double km = Math.Pow(x, y);
                    sall2 += km;
                }
                list1.Add(sall2);
            });
            list1.Sort();
            for (int i = 0; i < list1.Count; i++)
            {
                Console.WriteLine(list1[i]);
            }
            //Parallel.ForEach(list1, item =>
            //{
            //    Console.WriteLine(item);
            //});          
            sw.Stop();
            Console.WriteLine(string.Format("并行执行时间{0}毫秒", sw.ElapsedMilliseconds));

            sw.Reset();
            sw.Start();

            List<double> list2 = new List<double>();
            for (int j = 0; j < list.Count; j++)
            {
                double sall = 0;
                for (int k = 0; k < 10000000; k++)
                {
                    double x = Convert.ToDouble(1 * list[j]);
                    double y = Convert.ToDouble(2);
                    double km = Math.Pow(x, y);
                    sall += km;
                }
                list2.Add(sall);
            }
            list2.Sort();
            for (int i = 0; i < list2.Count; i++)
            {
                Console.WriteLine(list2[i]);
            }
            sw.Stop();
            Console.WriteLine(string.Format("同步执行时间{0}毫秒", sw.ElapsedMilliseconds));
            Console.ReadKey();
        }
    }
}