CODEWITHSUNDEEP
c#.net-coreazure-functionsiformfile
Deivydas Voroneckis
Deivydas Voroneckis

Reputation: 2513

Uploading file IFormFile to Azure C# function

I have this regular C# Azure function:

[FunctionName("Function1")]
public static async Task<IActionResult> Run(
    [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
    ILogger log) ...

And I need to upload here file, e.g. image. How can I add here IFormFile or is there other way to upload file to function?

Upvotes: 3

Views: 2319

Answers (2)

Ayush srivastava
Ayush srivastava

Reputation: 1

Hey U must explore multitype/form-data content-type, for the isolated azure functions, and fetch the file and file info manually from there.

C# code for reference:

var contentType = req.Headers.FirstOrDefault(h => h.Key.Equals("Content-Type"))
        .Value.FirstOrDefault();

    if (contentType == null || !contentType.StartsWith("multipart/form-data"))
    {
        var badResponse = req.CreateResponse(System.Net.HttpStatusCode.BadRequest);
        badResponse.WriteString("Invalid content type. Expecting multipart/form-data.");
        return badResponse;
    }

    var boundary = MediaTypeHeaderValue.Parse(contentType).Parameters
        .FirstOrDefault(p => p.Name.Equals("boundary"))?.Value;

    var reader = new MultipartReader(boundary, req.Body);
    var section = await reader.ReadNextSectionAsync();

    if (section != null && section.ContentDisposition != null)
    {
        var contentDispositionn = section.ContentDisposition;
        var contentDisposition = ContentDispositionHeaderValue.Parse(section.ContentDisposition);
        var fileName = contentDisposition.FileName?.Trim('"');
        var fileType = section.ContentType;
        byte[] fileContent;

        if (!string.IsNullOrEmpty(fileName))
        {
            var fileStream = section.Body;

            using (var memoryStream = new MemoryStream())
            {
                await fileStream.CopyToAsync(memoryStream);
                fileContent = memoryStream.ToArray();
            }
        }
    }

Upvotes: 0

rickvdbosch
rickvdbosch

Reputation: 15621

To upload a file to an Azure Function, have a look at the Form of the incoming HttpRequest.

This works for me:

public static async Task<IActionResult> Run(
    [HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "files")] HttpRequest req,
    ILogger log)
{
    foreach(var file in req.Form.Files)
    {
        using (var ms = new MemoryStream())
        {
            var file = req.Form.Files[0];
            await file.CopyToAsync(ms);
            ms.Seek(0, SeekOrigin.Begin);
            // Do something with the file
        }
    }

    return new OkResult();
}

Upvotes: 4

Related Questions