csharp 线程和异步任务片段

Posted 2021-05-12

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

class MainClass {

  static int SleepTime = 1000;
  static int ForCount = 100;
  static List<Task> Tasks = new List<Task>();

  public static void Main (string[] args)
  {
    Stopwatch stopWatch = new Stopwatch();
    stopWatch.Start();
    
    Console.WriteLine("async Started");
    Task t = null;
    for (int i =0; i < ForCount; ++i)
    {
      t = StartAsyncTasks();
      Tasks.Add(t);
    }
    Task.WaitAll(Tasks.ToArray());
    Console.WriteLine("async Finished");
    Console.WriteLine("in " + stopWatch.Elapsed.Seconds);
    Tasks.Clear();

    stopWatch.Restart();
    StartThreads();
    Console.WriteLine("in " + stopWatch.Elapsed.Seconds);
  }

  public static async Task StartAsyncTasks()
  {
    await Task.Delay(SleepTime);
  }

  public static void StartThreads()
  {
    Console.WriteLine("thread Started");
    Task t = null;
    for (int i =0; i < ForCount; ++i)
    {
      t = Task.Run( () => Thread.Sleep(SleepTime));
      Tasks.Add(t);
    }
    Task.WaitAll(Tasks.ToArray());
    Console.WriteLine("thread Finished");
  }
}