1f:T480,

Task MySnippet()
{
    return Task.Run(() =>
    {
        Console.WriteLine("我正在异步执行");
    });
}

await MySnippet();

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

class Demonstration
{
    static void Main()
    {
        Stopwatch sw = new Stopwatch();
        sw.Start();

        Task waitTask = WaitFor3Secs();

        waitTask.Wait();
        sw.Stop();

        Console.WriteLine("主程序在 " + sw.ElapsedMilliseconds / 1000.0 + " 秒后退出");
    }

    static async Task Wrapper()
    {
        await WaitFor3Secs();
    }

    static Task WaitFor3Secs()
    {
        TaskCompletionSource tcs = new TaskCompletionSource();
        Task task = tcs.Task;

        // 执行你的异步操作。为了演示，我们创建一个线程来睡眠
        Thread thread = new Thread(() =>
        {
            Thread.Sleep(3000);
            tcs.SetResult(null);
        });
        thread.Start();

        return task;
    }
}

20:T41b,

MyAwaitableType awaitable = new MyAwaitableType(1000);
await awaitable;

using System;
using System.Threading;

class Demonstration
{
    static void Main()
    {
        Console.WriteLine(SynchronizationContext.Current == null ? "context is null" : "context is non-null");
    }
}

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

class Demonstration
{
    static async Task WaitingOneSecond()
    {
        Console.WriteLine("Thread id : " + Thread.CurrentThread.ManagedThreadId);
        await Task.Delay(1000);
        Console.WriteLine("Thread id : " + Thread.CurrentThread.ManagedThreadId);
    }

    static void Main()
    {
        Task task = WaitingOneSecond();
        // No need to sync back to the previous context
        task.ConfigureAwait(false);
        task.Wait();
    }
}

设备	CPU周期	人类化时间
L1缓存	3	1秒
L2缓存	14	4.6秒
内存	250	83秒
磁盘	41,000,000	158天
网络	240,000,000	2.5年

简介

简介

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