Asp.Net Core API File Upload

Question

I am trying to create a log file upload API for an application (ASP.NET Core 3.1/C#). Basically, a file should be able to be uploaded on demand to the URL, and it save to Azure BLOB storage for later viewing.

When Testing from Postman, I have mixed results. If I leave the Content-Type header as-is, I get a "415 Unsupported Media Type" error:

If I un-check the Content-Type header, I hit the API successfully, but the log file is always NULL. After reading numerous posts with similar issues, I've tried with and without [FromForm], [Consumes], and a host of other such small changes, but cannot figure it out.

I'm assuming there's something simple I'm doing wrong or missing, but I'm out of ideas!

Below is the code for my API endpoint

        [HttpPost]
        [Consumes("multipart/form-data")]
        [Route("/api/beam/v1/{orgCode}/device/{deviceCode}/log")]
        [Authorize]
        public async Task<IActionResult> PostLogAsync(string orgCode, string deviceCode, [FromForm(Name = "log")] IFormFile log)
        {
            string lvBlobFileName;
            string lvContainerName;

            string strContent = Request.ContentType;

            lvContainerName = _configuration["StorageContainerLogs"];

            BlobContainerClient container = GetCloudBlobContainer(lvContainerName);

            lvBlobFileName = $"{orgCode}/{deviceCode}/{deviceCode}_{DateTime.Now.ToString("yyyyMMddhhmmss")}";
            BlobClient blob = container.GetBlobClient(lvBlobFileName);

            if (log == null)
                return Ok("No files to upload");

            using (Stream reader = log.OpenReadStream())
            {
                await blob.UploadAsync(reader);
            }

            return Ok();
        }

Any help appreciated!

Brando Zhang · Accepted Answer · 2021-05-12 06:08:44Z

4

As far as I know, if you want to post the file which will be auto model bind to the iformfile, you should use form-data instead of binary.

More details, you could refer to below postman setting:

Result:

answered May 12, 2021 at 6:08

Brando Zhang

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2 Comments

brad Over a year ago

Thanks for the tip - I didn't even realise you could switch the key from text to file in the form-data! Unfortunately it still didn't work though - but it could still be me using Postman wrong, first time using it!

brad Over a year ago

I take that back! I had the Content-Type header un-checked still. Once I ticked it back in, I had a file! Cheers!

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