How to Upload and download multiple files asynchronously

Question

Hi All, How to Upload and download multiple files asynchronously in Asp.Net Core MVC.

Rajanikant Hawaldar · Answer

try this too https://www.google.com/amp/s/tahirnaushad.com/2017/08/28/uploaddownload-files-in-asp-net-core-2-0/amp/

Akash Ghadage · Answer

The DownloadFileAsync/DownloadFileCompleted members of WebClient use the Event-based Asynchronous Pattern. If you want to use async and await, you should be using the Task-based Asynchronous Pattern. In this case, you should use the DownloadFileTaskAsync member, as such: private async Task DownloadFileAsync(DocumentObject doc) { try { using (WebClient webClient = new WebClient()) { string downloadToDirectory = @Resources.defaultDirectory + doc.docName; webClient.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials; await webClient.DownloadFileTaskAsync( new Uri(doc.docUrl), @downloadToDirectory); //Add them to the local Context.listOfLocalDirectories.Add(downloadToDirectory); } } catch (Exception) { Errors.printError( "Failed to download File: " + doc.docName); } } private async Task DownloadMultipleFilesAsync(List doclist) { await Task.WhenAll(doclist.Select(doc => DownloadFileAsync(doc))); } Please note that your Context.listOfLocalDirectories.Add and Errors.printError methods should be threadsafe.

Rajanikant Hawaldar · Answer

Hi Chittaranjan, try this https://dotnetriders.wordpress.com/articles/how-to-upload-and-download-files-asynchronously-using-asp-net-mvc-4-5/ https://www.c-sharpcorner.com/article/upload-download-files-in-asp-net-core-2-0/ Thanks