IFormFile 'System.InvalidOperationException' - asp.net-core

Question

The non-public.member _baseStream attribute in IFormFile in my ASP.NET Core application throws the following exception after uploading a file:
ReadTimeout = ((Microsoft.AspNetCore.Http.Internal.FormFile)BildUpload)._baseStream.ReadTimeout' threw an exception of type 'System.InvalidOperationException'
I'm trying to upload a file using a razor page with the following code:
<form method="post" enctype="multipart/form-data">
<div class="form-group">
<input type="file" name="BildUpload" />
</div>
<input type="submit" value="Upload" class="btn btn-default" />
</form>
In the codebehind class I only got the declaration and nothing else read or writes the paramter excepts the razor page:
public IFormFile BildUpload { get; set; }
Thanks for your help!
My final goal is to parse the file to a byte array and sava at to a database like this: How to Convert a file into byte array directly without its path(Without saving file)
But over there I'm getting a nullpointer exception.

Answer 1

You can read about file upload here to make sure that you did not missed any steps and in case you need more knowledge about file upload.

Answer 2

In case someone faces similar behavior. Here's my solution for uploading an image and converting it to a byte array (for storing it in a Microsoft SQL database):
First of all use the xaml code and the IFormFile property from the question.
In the code behind add this code to process the form data to a byte array:
public async Task<IActionResult> OnPostAsync(string id)
{
//get the "Kontakt" entity
if (!await SetKontaktAsync(id))
{
return NotFound();
}
//convert form data to byte array and assign it to the entity
if (BildUpload.Length > 0)
{
using (var ms = new MemoryStream())
{
BildUpload.CopyTo(ms);
Kontakt.Bild = ms.ToArray();
}
}
//save changes to the database
_context.Attach(Kontakt).State = EntityState.Modified;
await _context.SaveChangesAsync();
//reload page
return await OnGetAsync(Kontakt.GID);
}
Frameworks: ASP.NET Core 2.2, Entity Framework Core 2.2