Parallel.ForEach相對于foreach是多執行緒，并行操作;foreach是單執行緒品德操作，
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("回圈更改前的值："+item.Id+","+item.Age+","+item.Uname); } array = lst.ToArray(); //注意Parallel.ForEach 里面傳的是陣列， MaxDegreeOfParallelism = Environment.ProcessorCount指的是系統有幾個cpu就使用幾個cpu ParallelLoopResult result = Parallel.ForEach(array, new ParallelOptions { MaxDegreeOfParallelism = Environment.ProcessorCount },item => { item.Uname = "張" + item.Age; }); foreach (var item in array) { Console.WriteLine("回圈更改后的值：" + 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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標籤：C#