Webapi formdata upload (to DB) with extra parameters

Question

I need to upload file sending extra paramaters.

I have found the following post in stackoverflow: Webapi ajax formdata upload with extra parameters

It descri

Answer 1

I really needed the media type and length of the files uploaded so I modified @Mark Seefeldt answer slightly to the following:

public class MultipartFormFile
{
    public string Name { get; set; }
    public long? Length { get; set; }
    public string MediaType { get; set; }
    public Stream Stream { get; set; }
}

public class MultipartFormDataMemoryStreamProvider : MultipartMemoryStreamProvider
{
    private readonly Collection _isFormData = new Collection();
    private readonly NameValueCollection _formData = new NameValueCollection(StringComparer.OrdinalIgnoreCase);
    private readonly List _fileStreams = new List();

    public NameValueCollection FormData
    {
        get { return _formData; }
    }

    public List FileStreams
    {
        get { return _fileStreams; }
    }

    public override Stream GetStream(HttpContent parent, HttpContentHeaders headers)
    {
        if (parent == null)
        {
            throw new ArgumentNullException("parent");
        }

        if (headers == null)
        {
            throw new ArgumentNullException("headers");
        }

        var contentDisposition = headers.ContentDisposition;
        if (contentDisposition == null)
        {
            throw new InvalidOperationException("Did not find required 'Content-Disposition' header field in MIME multipart body part.");
        }

        _isFormData.Add(String.IsNullOrEmpty(contentDisposition.FileName));
        return base.GetStream(parent, headers);
    }

    public override async Task ExecutePostProcessingAsync()
    {
        for (var index = 0; index < Contents.Count; index++)
        {
            HttpContent formContent = Contents[index];
            if (_isFormData[index])
            {
                // Field
                string formFieldName = UnquoteToken(formContent.Headers.ContentDisposition.Name) ?? string.Empty;
                string formFieldValue = await formContent.ReadAsStringAsync();
                FormData.Add(formFieldName, formFieldValue);
            }
            else
            {
                // File
                var file = new MultipartFormFile
                {
                    Name = UnquoteToken(formContent.Headers.ContentDisposition.FileName),
                    Length = formContent.Headers.ContentLength,
                    MediaType = formContent.Headers.ContentType.MediaType,
                    Stream = await formContent.ReadAsStreamAsync()
                };

                FileStreams.Add(file);
            }
        }
    }

    private static string UnquoteToken(string token)
    {
        if (string.IsNullOrWhiteSpace(token))
        {
            return token;
        }

        if (token.StartsWith("\"", StringComparison.Ordinal) && token.EndsWith("\"", StringComparison.Ordinal) && token.Length > 1)
        {
            return token.Substring(1, token.Length - 2);
        }

        return token;
    }
}