IFormFile 'System.InvalidOperationException'

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.

That sounds like an XY problem. Why would this exception be a problem? Why are you trying to get the read timeout on an already read HTTP request body? — CodeCaster, Oct 09 '18 at 09:43
My goal is to parse the file to a byte array and save it to the database. I can't do this because of this exception. By parsing I get a null pointer exception. I'm trying to implement this: https://stackoverflow.com/questions/36432028/how-to-convert-a-file-into-byte-array-directly-without-its-pathwithout-saving-f — pschlz, Oct 09 '18 at 09:48
Show the code that leads to this exception. Nowhere in that question is anyone using `ReadTimeout`. See also https://learn.microsoft.com/en-us/aspnet/core/mvc/models/file-uploads?view=aspnetcore-2.1. — CodeCaster, Oct 09 '18 at 09:55
The official documentation link posted in @CodeCaster comment above has very good code samples to get you started. — cleftheris, Oct 09 '18 at 10:21

Janmejay Kumar · Answer 1 · 2018-10-12T04:50:30.150

0

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.

edited Oct 12 '18 at 04:50

answered Oct 09 '18 at 10:16

Janmejay Kumar

309
2
7

score 0 · Accepted Answer · answered Mar 27 '19 at 14:12

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

IFormFile 'System.InvalidOperationException'

2 Answers2