async-await

问题 I'm just wondering if it's possible to have async/await during DI. Doing the following, the DI fails to resolve my service. services.AddScoped(async provider => { var client = new MyClient(); await client.ConnectAsync(); return client; }); where as the following works perfectly fine. services.AddScoped(provider => { var client = new MyClient(); client.ConnectAsync().Wait(); return client; }); 回答1: Async/await doesn't make sense when resolving dependencies, because: Constructors can't be

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed last month . I have a problem with tasks in c#, and don't know how to use async await . I have 4 methods, something like: private async Task Name(parameters) {} How can I run all 4 methods simultaneously in the constructor, to reduce the execution time and optimize cpu usage. I tried Parallel.Invoke(() => but

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed last month . I have a problem with tasks in c#, and don't know how to use async await . I have 4 methods, something like: private async Task Name(parameters) {} How can I run all 4 methods simultaneously in the constructor, to reduce the execution time and optimize cpu usage. I tried Parallel.Invoke(() => but

问题 Can someone help me understand what I am not doing correctly? Consider this simple code var images = []; const [funImage, setFunImage] = useState([]); //Some function that does this below firebase.firestore().collection('PostedFunActivities').where("location", "==" , place).get().then((querySnapshot) =>{ querySnapshot.forEach(async(doc) =>{ const ref = firebase.storage().ref('images/'+ doc.data().image) const result = await ref.getDownloadURL(); images.push(result); }) setFunImage(images); })

问题 I have an event loop with coroutine method using asyncio . I enthusiast to looking for an equivalent of the following example using uvloop instead. Here's a simple asyncio event loop example: import asyncio async def read(**kwargs): oid = kwargs.get('oid', '0.0.0.0.0.0') time = kwargs.get('time', 1) try: print('start: ' + oid) except Exception as exc: print(exc) finally: await asyncio.sleep(time) print('terminate: ' + oid) def event_loop(configs): loop = asyncio.get_event_loop() for conf in

问题 I have an event loop with coroutine method using asyncio . I enthusiast to looking for an equivalent of the following example using uvloop instead. Here's a simple asyncio event loop example: import asyncio async def read(**kwargs): oid = kwargs.get('oid', '0.0.0.0.0.0') time = kwargs.get('time', 1) try: print('start: ' + oid) except Exception as exc: print(exc) finally: await asyncio.sleep(time) print('terminate: ' + oid) def event_loop(configs): loop = asyncio.get_event_loop() for conf in

问题 I'm currently building a Nodejs script which should interact with a web server and a local network device. In order to make the program as reliable as possible I want to do a simple ping test to check if the network device can be reached. var ping = require('ping'); function pingtest(host) { ping.sys.probe(host, function (isAlive) { var msg = isAlive ? 'host ' + host + ' is alive' : 'host ' + host + ' is dead'; console.log(msg); return isAlive; }); } let pingSuccessful = pingtest('192.168.178

问题 I'm currently building a Nodejs script which should interact with a web server and a local network device. In order to make the program as reliable as possible I want to do a simple ping test to check if the network device can be reached. var ping = require('ping'); function pingtest(host) { ping.sys.probe(host, function (isAlive) { var msg = isAlive ? 'host ' + host + ' is alive' : 'host ' + host + ' is dead'; console.log(msg); return isAlive; }); } let pingSuccessful = pingtest('192.168.178

问题 I'm creating multiple web workers making http calls. I have to limit the number of web workers and so I'm trying to wait for some of the workers to finish. here's an example of what I thought might work using Promises: anArray.map(async contact => { await new Promise((res, rej) => { const worker = new Worker('./http.worker', { type: 'module' }); worker.onmessage = () => { res(); }; worker.postMessage(contact); }); }); I thought this would wait for each promise to resolve before moving on to

问题 In an answer to one of my other questions, I was told that use of new Task(() => { }) is not something that is a normal use case. I was advised to use Func<Task> instead. I have tried to make that work, but I can't seem to figure it out. (Rather than drag it out in the comments, I am asking a separate question here.) My specific scenario is that I need the Task to not start right when it is declared and to be able to wait for it later. Here is a LinqPad example using new Task(() => { }) .