blazor server file upload silently crashes server

I'm testing image upload on my blazor server application. For this, my .razor component looks like this:

@page "/uploadtest" <h1>Upload Example</h1> <AuthorizeView> <Authorized> <p>A simple example with a model, which can upload images</p> <label> Load Images: <InputFile OnChange="@UploadImages" multiple accept=".jpg,.jpeg,.png" /> </label> </Authorized> <NotAuthorized> <p>To use this application, please <a href="Identity/Account/Login">log in</a> or <a href="Identity/Account/Register">register</a> a new account! </p> </NotAuthorized> </AuthorizeView> 

I put the code-behind in a separate .razor.cs file, the class looks like this:

public partial class UploadExample: ComponentBase { #region Protected Properties [Inject] protected AuthenticationStateProvider AuthenticationStateProvider { get; private set; } [Inject] protected IWebHostEnvironment WebHostEnvironment { get; private set; } #endregion #region Public Methods /// <summary> /// File upload /// Only images of type .jpg and png are allowed here. /// </summary> /// <param name="e"></param> /// <returns></returns> protected async Task UploadImages(InputFileChangeEventArgs ifc) { var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync(); var user = authState.User; if (user.Identity.IsAuthenticated) { try { string userId = user.FindFirst(c => c.Type.Contains("nameidentifier"))?.Value; string currentTime = DateTime.Now.ToString("yyyy-dd-M--HH-mm-ss"); string path = Path.Combine(WebHostEnvironment.WebRootPath, $@"UserData/{userId}/UploadTest/{currentTime}"); Directory.CreateDirectory(path); var files = ifc.GetMultipleFiles(); foreach (var file in files) { var filePath = Path.Combine(path, file.Name); await using FileStream fs = new(filePath, FileMode.Create); await file.OpenReadStream().CopyToAsync(fs); } } catch (Exception e) { Console.WriteLine(e.Message); } } } #endregion } 

Here are my issues:

• For some reason after the UploadImages() function is executed, the application silently crashes. I can't find anything useful in the console output nor are any exceptions thrown, it just stops with code -1. The files however are successfully uploaded to the expected folder. Furthermore, the crash seems to be independent from the function.
• The code currently stores the files in the wwwroot folder, which I am sure is a bad idea. I already have a data access layer, which is a separate class library and handles all the database stuff. Basically, I want only the path to the images stored in the database, but the data access library should still handle storage of the a images. Is it common to give IBrowserFile objects to a separate class library? If not, how would the data be sent to the data access layer?

Edit In the Dev-Options of my browser, I get the following error:

Error: Connection disconnected with error 'Error: WebSocket closed with status code: 1006 ().'.

as soon as I select any file for upload. I tested different things (with/without authorization, calling/not calling the UploadImages() functions, etc...)