How to upload files in asp.net core web api

Question

I am trying to implement a file upload in Asp.net Core. See my endpoit below:

    [HttpPost("upload")]
    [AllowAnonymous]
    public async Task<IActionResult> Post(List<IFormFile> files)
    {
        long size = files.Sum(f => f.Length);

        // full path to file in temp location
        var filePath = Path.GetTempFileName();

        foreach (var formFile in files)
        {
            if (formFile.Length > 0)
            {
                using (var stream = new FileStream(filePath, FileMode.Create))
                {
                    await formFile.CopyToAsync(stream);
                }
            }
        }


        return Ok(new { count = files.Count, size, filePath });
    }

When I test it using Postman I get the following result even if I select any file:

{
   "count": 0,
   "size": 0,
   "filePath": "/var/folders/24/rmgj9ypj37709tnhxr2hgtfr0000gn/T/tmpX0SwbF.tmp"
}

Provide more information, like how is the request you are sending expected, which mime type you used etc. — Tseng
– Tseng, Commented Jul 16, 2017 at 20:09

schwietertj · Accepted Answer · 2017-07-17 16:01:03Z

2

This should guide you in the right direction. The method is receiving a jQuery post object.

    [HttpPost]
    public async Task<IActionResult> ReadFileHeaders(IFormFile file)
    {
        if (file != null)
        {
            using (var stream = new MemoryStream())
            {
                await file.CopyToAsync(stream);
                // Now the file is loaded into the stream variable
            }
        }

        return BadRequest("File required");
    }

answered Jul 17, 2017 at 16:01

schwietertj

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Comments

koula · Accepted Answer · 2019-09-16 15:38:46Z

0

There is no problem on the code. But when using postman(or similar) you will need to have the same name("files" on your case) on the parameterIllustration

answered Sep 16, 2019 at 15:38

koula

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