ASP .NET Core - Send uploaded file as multipart/form-data to API endpoint

Question

From ASP .NET Core MVC I need to send request to API endpoint which requires multipart/form-data with the following format

{boundary value}
Content-Disposition: form-data; name='file'; filename='filename.jpg'
Content-Type: image/jpeg

{file content}
--{boundary value}--

Within controller, I have uploaded the file as IFormFile interface which has properties:

Content-Type
ContentDisposition

How can I construct multipart/form-data and send it?

I've tried to use MultipartFormDataContent which has overloaded constructor with string boundary but without success.

Mukul Keshari · Accepted Answer · 2019-11-21 10:44:28Z

1

 public async Task<HttpResponseMessage> PostMultipart(string apiendpoint, byte[] data)
        {

            var multipartContent = new MultipartFormDataContent(); // your boundary value if need anything can be passed in the contructore
            var fileContent = new ByteArrayContent(data);
            fileContent.Headers.ContentType =
                MediaTypeHeaderValue.Parse("image/jpeg");

            multipartContent.Add(fileContent, "file", "filename.jpg");
            //client is HttpClient static field in the class
            return await client.PostAsync(apiendpoint, multipartContent);
        }

answered Nov 21, 2019 at 10:44

Mukul Keshari

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