Multipart/Form-Data POST 요청 스트림에서 파일 바이트를 효율적으로 추출하는 방법은 무엇입니까?

public static async Task ParseFiles(
    Stream data, string contentType, Action<string, Stream> fileProcessor)
{
    // Parse multipart request content
    var streamContent = new StreamContent(data);
    streamContent.Headers.ContentType = MediaTypeHeaderValue.Parse(contentType);
    var provider = await streamContent.ReadAsMultipartAsync();

    // Iterate through file parts
    foreach (var httpContent in provider.Contents)
    {
        var fileName = httpContent.Headers.ContentDisposition.FileName;
        if (string.IsNullOrWhiteSpace(fileName)) continue;

        using (Stream fileContents = await httpContent.ReadAsStreamAsync())
        {
            // Process file bytes
            fileProcessor(fileName, fileContents);
        }
    }
}

public void Upload(Stream data)
{
    MultipartParser.ParseFiles(
           data, 
           WebOperationContext.Current.IncomingRequest.ContentType, 
           MyProcessMethod);
}