asynchronous

问题 I have a Task which starts a win process, which generates file if its not created yet and returns it. The problem is that the action is called more than once. To be more precisely its src attribute of a <track> element. I have ConcurrentDictionary<Guid, Task<string>> which keeps track of for which Id a process is currently running public async Task<string> GenerateVTTFile(Guid Id) { if (_currentGenerators.TryGetValue(id, out Task<string> task)) { return await task; // problem is here? } var t

问题 I have a Task which starts a win process, which generates file if its not created yet and returns it. The problem is that the action is called more than once. To be more precisely its src attribute of a <track> element. I have ConcurrentDictionary<Guid, Task<string>> which keeps track of for which Id a process is currently running public async Task<string> GenerateVTTFile(Guid Id) { if (_currentGenerators.TryGetValue(id, out Task<string> task)) { return await task; // problem is here? } var t

问题 I've been familiarizing myself with some of the things (that are planned to be) added in C# 8 & .NET Core 3.0, and am unsure on the correct way to implement IAsyncDisposable (at time of writing, this link has literally no guidance). In particular, it is unclear to me what to do in the case when an instance isn't explicitly disposed - that is, it isn't wrapped in an async using(...) and .DisposeAsync() isn't explicitly called. My first thought was to do that same thing I'd do when implementing

问题 I am just new to this world of asynchronous stuff. Please bear with my lack of knowledge. It is said when a method encounters await ... " It tells the awaitable to run the remainder of the method when it completes, and then returns from the async method. " I did not get this part. So does it mean the method still keeps on running synchronously and waits till the awaitable returns and then proceeds with the rest of the method? If not please explain then why Task.Run is needed to run a method

问题 One method is a standard async method, like this one : private static async Task AutoRetryHandlerAsync_Worker(Func<Task<bool>> taskToRun,...) I have tested two implementations, one that use await and the other uses .Wait() The two implementations are not equal at all because the same tests are failing with the await version but not the Wait() one. The goal of this method is to "execute a Task returned by the input function, and retry by executing the same function until it works" (with

问题 One method is a standard async method, like this one : private static async Task AutoRetryHandlerAsync_Worker(Func<Task<bool>> taskToRun,...) I have tested two implementations, one that use await and the other uses .Wait() The two implementations are not equal at all because the same tests are failing with the await version but not the Wait() one. The goal of this method is to "execute a Task returned by the input function, and retry by executing the same function until it works" (with

问题 Has anyone ever tried to handle network connexion errors with Puppeteer ? I tried by launching a random page and checking if I receive no errors until it works ( this try is in a for loop ) : try{ responseAwait = await page1.goto('https://www.residentadvisor.net/dj.aspx?country=01') } catch (err) { console.log('Page load fail : '+ err) if (err == 'Error: net::ERR_INTERNET_DISCONNECTED' || err == 'Error: net::ERR_NETWORK_CHANGED' || err == 'Error: net::ERR_NAME_NOT_RESOLVED'){ let

问题 public bool DownloadMp3File (DownloadedMp3 mp3) { WebClient client = new WebClient (); string filePath = ""; bool wasDownload = false; try { string song = mp3.SongName; filePath = @"mp3\" + song + ".mp3"; if (File.Exists (filePath)) { File.Delete (filePath); } DateTime tryCountNow = DateTime.Now; client = new WebClient (); client.DownloadFileAsync (new Uri (mp3.Url), filePath); client.DownloadProgressChanged += client_DownloadProgressChanged; client.DownloadFileCompleted += client

问题 Currently, I expose a rest endpoint in my application that kick of spring batch jobs. However, the requests are not scheduled asynchronously. Response is provided after job completes with batch status in the MyResponse object. @RestController @RequestMapping("/test") public class TestController { private MyProcessor processor; private RequestDataRepo repo; public TestController(final MyProcessor processor, final RequestDataRepo repo) { this.feedProcessor = feedProcessor; this.repo = repo; }

问题 This question already has answers here : Returning data from async call in Swift function (11 answers) Closed 9 months ago . I'm trying to get current document count belongs to spesific user from Firebase. Whenever i try to assign count value to my variable in closure, value is always shown as nill. So that i did couple of research, as a result i figured out networking sometimes takes so long and it happens asynchronously. So if i'm not wrong due to asynchronous returning a value inside a