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  • python 异步写入文件2022-07-26 14:05:27

    # -*- coding:utf-8 -*-import asyncioimport aiofilesimport time#异步操作时,函数名前必须加上asyncasync def func1(): #异步写入文件 async with aiofiles.open("text.txt","w",encoding="utf-8") as f: await f.write("hello func1!\n&quo

  • 7张图,20分钟就能搞定的async/await原理!为什么要拖那么久?2022-07-26 01:33:26

    前言 大家好,我是林三心,以最通俗的话,讲最难的知识点是我写文章的宗旨 之前我发过一篇手写Promise原理,最通俗易懂的版本!!!,带大家基本了解了Promise内部的实现原理,而提到Promise,就不得不提一个东西,那就是async/await,async/await是一个很重要的语法糖,他的作用是用同步的方式,执行异步操作

  • 多线程---await async用法2022-07-24 16:03:13

    1.概述 await/async:是个新语法,出现C#5.0,.NetFramework在4.5及以上(CLR4.0)是一个语法糖,不是一个全新的异步多线程使用方式.   语法糖:就是编译器提供的新功能 本身并不会产生新的线程,但是依托于Task而存在,所以程序执行时,也是有多线程的   async可以随便添加,可以不用await,但是awai

  • 异步http框架-httpx,实现异步协程请求url2022-07-20 18:32:51

    """ 协程介绍: 什么是协程? 简单来说,协程是一种基于线程之上,但又比线程更加轻量级的存在。对于系统内核来说,协程具有不可见的特性,所以这种由 程序员自己写程序来管理 的轻量级线程又常被称作 "用户空间线程"。 协程比多线程好在哪呢? 1. 线程的控制权在操

  • C#async\await组合2022-07-18 18:37:22

    一、概述   编译器提供的便捷功能,就是语法糖。我的理解是为了优化代码。被async修饰的函数被称之为异步函数,主要用于异步编程,着重于靠await实现回调机制。 二、声明    //async用在方法名之前 public static async Task<int> Test(){...} //await 用在task前面 await task;  

  • WebApi踩坑记2022-07-15 15:02:42

    1 Api使用Furion时,使用了List.ForEach( acction())  action中Throw Bah.Oh(...)    1 [HttpGet] 2 public async Task<int> ListForeach() 3 { 4 string[] list = { "1", "2", "3" }; 5 list.ToList().

  • c# 理解await和async语法糖2022-07-10 15:02:38

    很早以前就想写点东西,奈何总是比较懒,园子里面也有了很多优秀的文章,但是还是决定写点自己的理解,毕竟自己写了才是真的理解。 1.介绍 c# 中我们使用 await和async来进行异步编程,现在我们已经全面拥抱异步,很多同步方法都被废弃了。实际的开发过程中也是用的比较顺畅和舒服的,和同步代

  • python 中的协程2022-07-06 22:00:54

    import aiohttp import aiofiles import asyncio # 协程请求 async def get_page_one(href, pathName): async with aiohttp.ClientSession() as session: async with session.get(href, headers=header) as resp: hm = await resp.text(encoding="

  • 7张图,20分钟就能搞定的async/await原理!为什么要拖那么久?2022-07-06 01:04:21

    前言 大家好,我是林三心,以最通俗的话,讲最难的知识点是我写文章的宗旨 之前我发过一篇手写Promise原理,最通俗易懂的版本!!!,带大家基本了解了Promise内部的实现原理,而提到Promise,就不得不提一个东西,那就是async/await,async/await是一个很重要的语法糖,他的作用是用同步的方式,执行异步操作

  • 8张图帮你一步步看清 async/await 和 promise 的执行顺序2022-07-06 00:35:17

    需要具备的前置知识 promise的使用经验 浏览器端的eventloop 不过如果是对 ES7 的 async 不太熟悉,是没关系的哈,因为这篇文章会详解 async。 那么如果不具备这些知识呢,推荐几篇我觉得讲得比较清楚的文章 https://segmentfault.com/a/11... 这是我之前写的讲解eventloop的文章,我

  • .Net Core中无处不在的Async/Await是如何提升性能的?2022-07-05 23:02:17

    目录 一、简介 二、Async/Await有什么用? 1.Async/Await用法示例 2.async/await的特点 3.async/await能提升性能吗? 4.代码对照说明   回到顶部 一、简介 Async/Await在.Net Core中真的是无处不在,到处都是异步操作,那为什么要用?有什么作用?别人说能提升性能?网上一堆文章看的

  • await keyword blocks main thread2022-07-05 16:35:30

    await keyword blocks main thread 问题 So I have the following code private async void button1_Click(object sender, EventArgs e) { await DoSomethingAsync(); MessageBox.Show("Test"); } private async Task DoSomethingAsync() { for (int

  • Vue中预览HIKVSION海康威视摄像头时ip不通浏览器卡死问题解决2022-07-05 16:01:30

    场景 SpringBoot+Vue+HIKVSION实现摄像头多选并多窗口预览(插件版): https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/121180769 在上面的基础上进行摄像头预览时,如果电脑与摄像头Ip网络不通或者用户名、密码等信息配置错误时,会导致整个浏览器卡死无响应。 翻找其官方

  • async封装ajax请求2022-07-05 14:35:23

    1 function getData(url, type, data){ // 这个相当于请求的数据 2 return new Promise((resolve, reject) => { 3 let xhr = new XMLHttpRequest(); 4 xhr.open('get', url); 5 xhr.

  • How do you create an asynchronous method in C#?2022-07-05 14:02:53

    How do you create an asynchronous method in C#? 问题 Every blog post I've read tells you how to consume an asynchronous method in C#, but for some odd reason never explain how to build your own asynchronous methods to consume. So I have this code righ

  • What is the use for Task.FromResult<TResult> in C#2022-07-05 14:00:54

    What is the use for Task.FromResult<TResult> in C# 问题 In C# and TPL (Task Parallel Library), the Task class represents an ongoing work that produces a value of type T. I'd like to know what is the need for the Task.FromResult method ? That is:

  • Executing tasks in parallel2022-07-04 18:31:37

    Executing tasks in parallel 问题 Ok, so basically I have a bunch of tasks (10) and I want to start them all at the same time and wait for them to complete. When completed I want to execute other tasks. I read a bunch of resources about this but I can'

  • What the async keyword actually does2022-07-04 10:05:08

    What the async keyword actually does When it comes to curiousity about inner workings of C# keywords or construct, async and await are at the top of my list by a mile. The amount of complicated intrinsics packed into two simple keywords which magically im

  • Common async / Task mistakes, and how to avoid them2022-07-04 10:03:41

    Common async / Task mistakes, and how to avoid them The .Net async / await mechanism is a godsend when it comes to making asynchronous code accessible, but despite being a superb abstraction, there are still a lot of subtle pitfalls a lot of developers fa

  • Error `Async test method must have non-void return type` when upgrading from NUnit 2 to NUnit 32022-07-03 23:00:12

    Error `Async test method must have non-void return type` when upgrading from NUnit 2 to NUnit 3 回答 The error Async test method must have non-void return type means that in NUnit 3+, an async Unit Test itself may not have a void return type (i.e. the metho

  • MSXML2.DOMDocument加载Internet资源2022-07-03 20:04:25

    MSXML2.DOMDocument加载Internet资源 The information in this article applies to: Microsoft XML, versions 2.5,2.6, 3.0   SYMPTOMS 如果你调用MSXML.DOMDocument或者MSXML.DOMDocument的Load方法来加载一个XML文件资源,而访问这个XML文件是Internet上的资源,那么具体会有

  • JS异步操作async修饰符2022-07-03 12:34:48

    async 函数是使用async关键字声明的函数。 async 函数是AsyncFunction构造函数的实例, 并且其中允许使用await关键字。async和await关键字让我们可以用一种更简洁的方式写出基于Promise的异步行为,而无需刻意地链式调用promise。 import thenFs from "then-fs"; // 用async与await

  • async/await - when to return a Task vs void?2022-07-02 14:01:13

    async/await - when to return a Task vs void? 问题 Under what scenarios would one want to use public async Task AsyncMethod(int num) instead of public async void AsyncMethod(int num) The only scenario that I can think of is if you need the task to be able t

  • AsyncCommand Exception-Handling2022-07-02 14:00:08

    AsyncCommand Exception-Handling 问题 I'm using an AsyncCommand to execute something like this: C# private async Task Refresh() { try { await somethingAsync(); } catch (Exception ex) { if (ex is SessionExpiredException) t

  • async/await2022-07-01 16:31:22

    async 和 await 在干什么 任意一个名称都是有意义的,先从字面意思来理解。async 是“异步”的简写,而 await 可以认为是 async wait 的简写。所以应该很好理解 async 用于申明一个 function 是异步的,而 await 用于等待一个异步方法执行完成。 另外还有一个很有意思的语法规定,await

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