// Program.cs
using System;
using System.Diagnostics;
using System.Threading;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("早起三件事開始...");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Dress();
            BrushTeeth();
            WashFace();
            sw.Stop();
            Console.WriteLine($"...早起三件事完成, 總耗時 {sw.Elapsed.Seconds} 秒");
            Console.ReadKey();
        }

        /// <summary>
        /// 穿衣
        /// </summary>
        static void Dress()
        {
            Console.WriteLine($"穿衣開始...");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Thread.Sleep(timeout: TimeSpan.FromSeconds(value: 1));
            sw.Stop();
            Console.WriteLine($"...穿衣完成, 耗時 {sw.Elapsed.Seconds} 秒");
        }

        /// <summary>
        /// 刷牙
        /// </summary>
        static void BrushTeeth()
        {
            Console.WriteLine($"刷牙開始...");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Thread.Sleep(timeout: TimeSpan.FromSeconds(value: 3));
            sw.Stop();
            Console.WriteLine($"...刷牙完成, 耗時 {sw.Elapsed.Seconds} 秒");
        }

        /// <summary>
        /// 洗臉
        /// </summary>
        static void WashFace()
        {
            Console.WriteLine($"洗臉開始...");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Thread.Sleep(timeout: TimeSpan.FromSeconds(value: 5));
            sw.Stop();
            Console.WriteLine($"...系列完成, 耗時 {sw.Elapsed.Seconds} 秒");
        }
    }
}

運行之后, 等待一會, 會看到如下輸出:

早起三件事開始...
穿衣開始...
...穿衣完成, 耗時 1 秒
刷牙開始...
...刷牙完成, 耗時 3 秒
洗臉開始...
...系列完成, 耗時 5 秒
...早起三件事完成, 總耗時 9 秒

一件一件事慢慢來, 總耗時 9 秒...

趕時間

一看時間, 哎呦我去, 快遲到了, 穿衣 & 刷牙 & 洗臉一起來吧...別問我現(xiàn)實中怎么實現(xiàn)的

總而言之代碼是這樣滴:

// Program.cs
using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("早起三件事開始...");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Task dressTask = Task.Factory.StartNew(action: Dress);
            Task brushTeethTask = Task.Factory.StartNew(action: BrushTeeth);
            Task washFaceTask = Task.Factory.StartNew(action: WashFace);
            Task.WaitAll(dressTask, brushTeethTask, washFaceTask);
            sw.Stop();
            Console.WriteLine($"...早起三件事完成, 總耗時 {sw.Elapsed.Seconds} 秒");
            Console.ReadKey();
        }

        /// <summary>
        /// 穿衣
        /// </summary>
        static void Dress()
        {
            Console.WriteLine($"穿衣開始...");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Thread.Sleep(timeout: TimeSpan.FromSeconds(value: 1));
            sw.Stop();
            Console.WriteLine($"...穿衣完成, 耗時 {sw.Elapsed.Seconds} 秒");
        }

        /// <summary>
        /// 刷牙
        /// </summary>
        static void BrushTeeth()
        {
            Console.WriteLine($"刷牙開始...");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Thread.Sleep(timeout: TimeSpan.FromSeconds(value: 3));
            sw.Stop();
            Console.WriteLine($"...刷牙完成, 耗時 {sw.Elapsed.Seconds} 秒");
        }

        /// <summary>
        /// 洗臉
        /// </summary>
        static void WashFace()
        {
            Console.WriteLine($"洗臉開始...");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Thread.Sleep(timeout: TimeSpan.FromSeconds(value: 5));
            sw.Stop();
            Console.WriteLine($"...系列完成, 耗時 {sw.Elapsed.Seconds} 秒");
        }
    }
}

啟動運行之后, 等待一會, 你應該會看到如下輸出: