c# - Task Wait WaitAll WhenAll WhenAny

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

namespace TaskWaitTesting
{
    class Program
    {
        private static Random R = new Random();

        static void Main(string[] args)
        {
            TestWait();
            //TestWaitAll(RetrieveTasks(10));
            //TestWhenAll(RetrieveTasks(10));
            //TestWaitAny(RetrieveTasks(10));
            //TestWhenAny(RetrieveTasks(10));

            // 主线程
            while (true)
            {
                Console.WriteLine("Main thread is working...");
                Thread.Sleep(2000);
            }
        }

        private static void TestWait()
        {
            Console.WriteLine(string.Format("================{0}================", MethodBase.GetCurrentMethod().Name));
            // Task with Action