原地址路径:https://www.cnblogs.com/personblog/archive/2019/10/09/11640801.html

Parallel.ForEach相对于foreach是多线程,并行操作;foreach是单线程循环操作。

static void Main(string[] args)        {            Console.WriteLine("Hello World!");            List<UserInfo> lst = new List<UserInfo> { };            UserInfo[] array = new UserInfo[] {};            for (int i = 1; i <= 10; i++)            {                lst.Add(new UserInfo { Age=new Random().Next(1,10),Id=Guid.NewGuid()});            }            foreach (var item in lst)            {                Console.WriteLine("循环更改前的值:"+item.Id+","+item.Age+","+item.Uname);            }            array = lst.ToArray();            //注意Parallel.ForEach 里面传的是数组, MaxDegreeOfParallelism = Environment.ProcessorCount指的是系统有几个cpu就使用几个cpu            ParallelLoopResult result = Parallel.ForEach(array, new ParallelOptions { MaxDegreeOfParallelism = Environment.ProcessorCount },item =>            {                item.Uname = "张" + item.Age;                          });            foreach (var item in array)            {                Console.WriteLine("循环更改后的值:" + item.Id + "," + item.Age + "," + item.Uname);            }            Console.ReadKey();        }

public class UserInfo    {        public Guid Id { get; set; }        public Int32 Age { get; set; }        public String Uname { get; set; }    }

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