async-await

问题 I'm running puppeteer on express/node/ubuntu as follow: var puppeteer = require('puppeteer'); var express = require('express'); var router = express.Router(); /* GET home page. */ router.get('/', function(req, res, next) { (async () => { headless = true; const browser = await puppeteer.launch({headless: true, args:['--no-sandbox']}); const page = await browser.newPage(); url = req.query.url; await page.goto(url); let bodyHTML = await page.evaluate(() => document.body.innerHTML); res.send

问题 Suppose I have a C# controller that calls into some arbitrary function that returns a Task (for instance because it performs a database transaction). Should I always use async and await, or should I just return the task? Example controller: public async Task<string> DoSomething() { return await SomeOtherFunctionThatReturnsATask(); } Should I change this into: public Task<string> DoSomething() { return SomeOtherFunctionThatReturnsATask(); } Or does it really not matter? 回答1: Yes, you should

问题 In my .NET Framework 4.5 Windows Forms project I have an async event handler. In the event handler I open a OpenFileDialog with ShowDialog() . Then I want to do something async with the selected file. But I have some weird behavior: After closing the dialog (with Cancel or OK button) I have got a delay of 9 seconds until the ShowDialog returned with its result. While this time the application is freezed. Here my code: private async void buttonBrowse_Click(object sender, EventArgs e) {

问题 In my .NET Framework 4.5 Windows Forms project I have an async event handler. In the event handler I open a OpenFileDialog with ShowDialog() . Then I want to do something async with the selected file. But I have some weird behavior: After closing the dialog (with Cancel or OK button) I have got a delay of 9 seconds until the ShowDialog returned with its result. While this time the application is freezed. Here my code: private async void buttonBrowse_Click(object sender, EventArgs e) {

问题 In my .NET Framework 4.5 Windows Forms project I have an async event handler. In the event handler I open a OpenFileDialog with ShowDialog() . Then I want to do something async with the selected file. But I have some weird behavior: After closing the dialog (with Cancel or OK button) I have got a delay of 9 seconds until the ShowDialog returned with its result. While this time the application is freezed. Here my code: private async void buttonBrowse_Click(object sender, EventArgs e) {

问题 In my .NET Framework 4.5 Windows Forms project I have an async event handler. In the event handler I open a OpenFileDialog with ShowDialog() . Then I want to do something async with the selected file. But I have some weird behavior: After closing the dialog (with Cancel or OK button) I have got a delay of 9 seconds until the ShowDialog returned with its result. While this time the application is freezed. Here my code: private async void buttonBrowse_Click(object sender, EventArgs e) {

问题 In my .NET Framework 4.5 Windows Forms project I have an async event handler. In the event handler I open a OpenFileDialog with ShowDialog() . Then I want to do something async with the selected file. But I have some weird behavior: After closing the dialog (with Cancel or OK button) I have got a delay of 9 seconds until the ShowDialog returned with its result. While this time the application is freezed. Here my code: private async void buttonBrowse_Click(object sender, EventArgs e) {

问题 In my .NET Framework 4.5 Windows Forms project I have an async event handler. In the event handler I open a OpenFileDialog with ShowDialog() . Then I want to do something async with the selected file. But I have some weird behavior: After closing the dialog (with Cancel or OK button) I have got a delay of 9 seconds until the ShowDialog returned with its result. While this time the application is freezed. Here my code: private async void buttonBrowse_Click(object sender, EventArgs e) {

问题 In my .NET Framework 4.5 Windows Forms project I have an async event handler. In the event handler I open a OpenFileDialog with ShowDialog() . Then I want to do something async with the selected file. But I have some weird behavior: After closing the dialog (with Cancel or OK button) I have got a delay of 9 seconds until the ShowDialog returned with its result. While this time the application is freezed. Here my code: private async void buttonBrowse_Click(object sender, EventArgs e) {

问题 In my .NET Framework 4.5 Windows Forms project I have an async event handler. In the event handler I open a OpenFileDialog with ShowDialog() . Then I want to do something async with the selected file. But I have some weird behavior: After closing the dialog (with Cancel or OK button) I have got a delay of 9 seconds until the ShowDialog returned with its result. While this time the application is freezed. Here my code: private async void buttonBrowse_Click(object sender, EventArgs e) {