2024 Downloadfileasync cannot await void

Downloadfileasync cannot await void

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August undefined, 2024

WebDec 14, 2024 · Looks like WebClient.DownloadFileAsync returns 'void'. This doesn't work with await. To simplify: the 'await' operator works by taking a Task or Task and "pausing" the method until the task is complete. You should see if you can rewrite your sample using a newer API like HttpClient and GetStreamAsync. Share Improve this … WebMar 11, 2024 · 2 Answers. Sorted by: 0. Look at the error, there's already a file with that name! You must either delete the directory, before you use ZipFile.ExtractToDirectory method OR use the method, that will overwrite existing directory: ZipFile.ExtractToDirectory (zipPath, extractPath, true); Share. Improve this answer. Follow.

How to stop main thread till the downloading of file completed

WebSorted by: 1. As others have pointed, The two methods shown are either not asynchronous or not awaitable. First, you need to make your download method awaitable: private async static Task DownloadAsync (string url, string filePath) { using (var webClient = new WebClient ()) { IWebProxy webProxy = WebRequest.DefaultWebProxy; … WebMay 30, 2024 · You should avoid async void for several reasons, one of which is composability. If the method cannot be made to return Task (e.g., it's an event handler), then you can use SemaphoreSlim to have the method signal when it is about to exit. Consider doing this in a finally block. Share Improve this answer Follow answered Nov … reardon pfas

c# - How to use the WebClient.DownloadDataAsync() method in …

WebFeb 11, 2013 · After launching the DownloadFileAsync, you must do a. while (wc.IsBusy){ Application.Doevents();} to wait for completion in the current thread, then you can finish. (see this) Hope this helps. 3. 0. Ketsuekiame commented: Ah yes, I missed this. Effectively the op will start the download and then it will exit. +8. Web并行.通知记忆使用量不断增长[英] Parallel.ForEach memory usage keeps growing WebMay 17, 2016 · Normally if a function has an async variant it is the async-await version. Instead of void it returns Task and instead of TResult it returns Task . Alas WebClient already has an DownloadFileAsync. Therefore they created a DownloadFileTaskAsync. That one returns an (awaitable) Task – Harald Coppoolse … reardon ohio

c# - DownloadFile vs DownloadFileAsync - Stack Overflow

WebMay 14, 2015 · And my problem is that once it finds a new version and starts downloading the file webClient.DownloadFileAsync(url, sFilePathToWriteFileTo);, it instantly runs the code below which is the changing name, unzipping and downloading new version file … WebMay 31, 2013 · WebClient DownloadFileAsync () blocks thread. I'm trying to download a large file (500 mb) from my webserver using WPF and MVVM. Thus the following properties are all bound to some kind of controls (progressbar). The problem is, that the application still hangs, even while using DownloadFileAsync. The file is being downloaded as I can tell … reardon properties minneapolisWebJan 15, 2024 · There is a newer DownloadDataTaskAsync method that allows you to await the result. It is simpler to read and easier to wire up by far. I'd use that... var client = new WebClient (); var data = await client.DownloadDataTaskAsync (new Uri (imageUrl)); await outstream.WriteAsync (data, 0, data.Length); Share Improve this answer Follow reardon of monroe

"WebApr 2, 2024 · WebClient webClient = new WebClient (); webClient.DownloadFileCompleted += new AsyncCompletedEventHandler (Completed); … " - Downloadfileasync cannot await void

Downloadfileasync cannot await void

WebJan 8, 2014 · await WebClient.DownloadFileAsync (...) DownloadFileAsync is fires an asynchronous operation and returns a task that will complete when the operation ended. … WebSep 12, 2024 · WebClient.DownloadFileAsync doesn't throw exceptions on HTTP request failures. You need to subscribe to the DownloadFileCompleted event to get notified of errors. However, I don't recommend messing with event handler callbacks once we have the task-based async/await feature in C#: WebClient.DownloadFileTaskAsync is much more …

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WebDownloadFileAsync also started in the UI context, but then stepped out of its context by calling ConfigureAwait (false). The rest of DownloadFileAsync runs in the thread pool context. However, when … WebNov 5, 2012 · Following this example, you first create the async task wtih, then get its result using await: Task downloadStringTask = client.DownloadStringTaskAsync (new Uri (uri)); string result = await downloadStringTask; Share Improve this answer Follow edited Feb 20, 2016 at 19:17 l0pan 466 7 11 answered Nov 5, 2012 at 21:49 McGarnagle

WebOct 14, 2024 · The method DownloadFileAsync has been thought long before await/async was implemented The method I was looking for is called DownloadFileTaskAsync, a straightforward async file downloader, and there is no need to rewrite a wrapper Share Improve this answer Follow answered Oct 14, 2024 at 16:57 XavierAM 1,576 1 13 29 …

WebJun 3, 2016 · @Xami3 I'm getting exception @ await webClient.DownloadFileAsync (new Uri (strUri), strDestFilename); as Cannot await void . Wednesday, July 22, 2015 10:55 AM. text/html 7/22/2015 11:15:18 AM ... but if it is giving exception saying "Cannot await void" then it does not return a Task. plz hide loader in the completed event of the webclient. ... WebDec 15, 2024 · 8. First, you should declare the three smaller tasks as Task instead of Task, otherwise you won't get anything in res. Of course, that's not a problem if you don't need anything in res. The more important issue here is that you should use WhenAll instead of WaitAll. The former returns a Task or Task for you to await, whereas the ...

WebJan 6, 2024 · @dr.null It's not about awaiting an async call in an async void method, it's DownloadFileAsync that is not awaitable. It's an AsyncOperation, i.e., it's asynchronous in the old terms, driven by events, it cannot be handled as a Task, simply because it's not. –

WebFeb 17, 2024 · True, it's not a case of an async void delegate. The thing is that the DownloadFileAsync returns a Task, and the PLINQ knows nothing about tasks. So all the tasks created by the DownloadFileAsync method are just ignored, they are not await ed, and so they become fire-and-forget tasks. – Theodor Zoulias Feb 18, 2024 at 5:24 2 reardon propertiesWebApr 3, 2024 · public void getFile() { var pathToNewFolder = cacheDir; Directory.CreateDirectory(pathToNewFolder); try { WebClient webClient = new WebClient(); webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed); reardon plumbing gilmer txWebDownloadFileAsync also started in the UI context, but then stepped out of its context by calling ConfigureAwait (false). The rest of DownloadFileAsync runs in the thread pool context. However, when DownloadFileAsync completes and DownloadFileButton_Click resumes, it does resume in the UI context. reardon of monroe waWebMay 22, 2015 · The "UploadAsync" method does not return any value, that's what it seems if you say "Cannot await 'void'" Try removing "LiveOperationResult operationResult =" from the line of code and just write - await this.liveClient.UploadAsync ("/me/skydrive", fileName, e.ImageStream, OverwriteOption.Overwrite); Same for the second line of code- reardon parkWebSep 4, 2015 · Why does the downloading begin before WaitAll is called? First of all, you're not calling Task.WaitAll, which synchronously blocks, you're calling Task.WhenAll, which returns an awaitable which should be awaited.. Now, as others said, when you call an async method, even without using await on it, it fires the asynchronous operation, because any … reardon realty auburn nyWebJun 3, 2015 · Create a WebClientAsync class that implements the timer in the constructor. This way you aren't copying and pasting the timer code into every implementation. public class WebClientAsync : WebClient { private int _timeoutMilliseconds; public EdmapWebClientAsync (int timeoutSeconds) { _timeoutMilliseconds = timeoutSeconds * … reardon plumbingWebNov 1, 2024 · Your method is async so ideal implementation will be await Task.Delay (3000) Thread.Sleep is going to block your current thread and Task.Delay is going to delay logically without blocking your current thread. Thread.sleep should not be used in asynchronous operation instead we should use Task.Delay (3000) and vice versa. Share Improve this … reardon renovations