multipart form - Web API

Question

I have a ASP.NET MVC project that needs an API controller which will accept a posted multipart form and extract the data out of the <formroot> xml tag (which is highlighted)

I am struggling on getting this working any help would be greatly appreciated

Currently I have a controller called UploadController and this is the code I currently have

public class UploadController : ApiController
{
    public async Task<HttpResponseMessage> PostFormData()
    {
        if (!Request.Content.IsMimeMultipartContent())
        {
            throw new HttpResponseException(HttpStatusCode.BadRequest);
        }

        string root = HttpContext.Current.Server.MapPath("~/App_Data");
        var provider = new MultipartFormDataStreamProvider(root);

        try
        {
            //Need to get the data from within the formroot tag


            return Request.CreateResponse(HttpStatusCode.OK);
        }
        catch (Exception e)
        {
            return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e);
        }
    }
}

I am unsure the best way to get the data from within the formroot, also forgive me if any of the code above is not correct.

Answer 1

Inside the web API controller you can access the XML file by using the code below :-

HttpPostedFile xmlFile = HttpContext.Current.Request.Files[0];

If you have more than one files posted, replace Files[0] with respective count 1 or 2 etc. Now you can load the file into a XmlDocument Object and extract the required node from it like :-

XmlDocument doc = new XmlDocument();
doc.Load(xmlFile.InputStream);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("ab", "www.w3.org/2001/XMLSchema-instance");
XmlNode node = doc.SelectSingleNode("//ab:formroot", nsmgr);

Then you can perform whatever you functionality is provided with the node.