推荐订阅源

以下代码是对官方示例的修改：

using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            MakeBreakfast01();
            MakeBreakfast02();
            MakeBreakfast03();
            Console.ReadLine();
        }

        // 烤面包、煎蛋、煎肉一样一样做
        public static void MakeBreakfast01()
        {            
            Console.WriteLine("开始做早餐01");
            Stopwatch watch = Stopwatch.StartNew();
            Task.Run(async () =>
            {
                await ToastBreadAsync();
                await FryEggsAsync();
                await FryBaconAsync();
            }).Wait();
            watch.Stop();
            Console.WriteLine($"早餐01完成，耗时{watch.Elapsed.Seconds}秒");
        }

        // 有一个面包机和一个锅，煎蛋、煎肉先后进行，烤面包同时进行
        public static void MakeBreakfast02()
        {            
            Console.WriteLine("开始做早餐02");
            Stopwatch watch = Stopwatch.StartNew();
            var taskToastBread = ToastBreadAsync();
            var taskFryEggsAndBacon = Task.Run(async () =>
            {
                await FryEggsAsync();
                await FryBaconAsync();
            });            
            Task.WaitAll(taskToastBread, taskFryEggsAndBacon);
            watch.Stop();
            Console.WriteLine($"早餐02完成，耗时{watch.Elapsed.Seconds}秒");
        }

        // 有一个面包机和两个锅，烤面包、煎蛋、煎肉三项同时进行
        public static void MakeBreakfast03()
        {            
            Console.WriteLine("开始做早餐03");
            Stopwatch watch = Stopwatch.StartNew();
            var taskToastBread = ToastBreadAsync();
            var taskFryEggs = FryEggsAsync();
            var taskFryBacon = FryBaconAsync();
            Task.WaitAll(taskToastBread, taskFryEggs, taskFryBacon);
            watch.Stop();
            Console.WriteLine($"早餐03完成，耗时{watch.Elapsed.Seconds}秒");
        }

        // 煎蛋
        public static async Task FryEggsAsync()
        {
            Console.WriteLine("开始煎蛋");
            await Task.Delay(1000);
            Console.WriteLine("煎蛋完成");
        }

        // 煎肉
        public static async Task FryBaconAsync()
        {
            Console.WriteLine("开始煎肉");
            await Task.Delay(1000);
            Console.WriteLine("煎肉完成");
        }

        // 烤面包
        public static async Task ToastBreadAsync()
        {
            Console.WriteLine("开始烤面包");
            await Task.Delay(1000);
            Console.WriteLine("烤面包完成");
        }
    }
}

运行结果：