passing a file in to an Core 2.1 WebApi method

Simon_Whale

I have the following API Controller with a simple method to accept a file via the IFormfile, which works a treat in Postman. Now I need to call this with a HttpClient call from a console application.

[HttpPost]
public IActionResult PostFile(IFormFile file)
{
//Do Stuff
Return OK();
}

This is where I am stuck can anyone give me a good couple of examples of creating a PostAsync call so that I can transfer a file to the server? Thanks Simon

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Richard Deeming

Something like this should work:

public static async Task UploadFile(HttpClient client, string url, string filePath, string contentType, CancellationToken cancellationToken)
{
// Argument validation omitted...

using (var fileStream = File.OpenRead(filePath))
{
    var file = new StreamContent(fileStream);
    file.Headers.ContentType = MediaTypeHeaderValue.Parse(mimeType);
    file.Headers.ContentLength = fileStream.Length;
    
    var content = new MultipartFormDataContent();
    content.Add(file, "file", Path.GetFileName(filePath));
    
    using (var response = await client.PostAsync(url, content, cancellationToken).ConfigureAwait(false))
    {
        response.EnsureSuccessStatusCode();
    }
}

}

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Simon_Whale

Richard, Thanks for this and apologies that I have taken so long to respond, had to tweak your solution slightly to make it work

using (var formData = new MultipartFormDataContent())
{
Task responseMessage = null;
using (var stream = File.OpenRead(pdf))
{
HttpContent fileStreamContent = new StreamContent(stream);
fileStreamContent.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("form-data")
{ Name = "DigitalPCN", FileName = Path.GetFileName(fine.FileName) };
fileStreamContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
formData.Add(fileStreamContent);

                responseMessage = base.PostAsync(new Uri(@"https://localhost:44349/api/Controller/Method"), formData, token);
                responseMessage.Wait();
            }

            return responseMessage.Result;

}

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