How do I get posted data in MVC Action?

Question

I am trying to post some data to a ASP.NET MVC Controller Action. Current I am trying to use WebClient.UploadData() to post several parameters to my action.

The following will hit the action but all the parameters are null. How can get the posted data from the http request?

string postFormat = "hwid={0}&label={1}&interchange={2}localization={3}";
var hwid = interchangeDocument.DocumentKey.Hwid;
var interchange = HttpUtility.UrlEncode(sw.ToString());
var label = ConfigurationManager.AppSettings["PreviewLabel"];
var localization = interchangeDocument.DocumentKey.Localization.ToString();

string postData = string.Format(postFormat, hwid, interchange, label, localization);

using(WebClient client = new WebClient())
{
   client.Encoding = Encoding.UTF8;
   client.Credentials = CredentialCache.DefaultNetworkCredentials;
   byte[] postArray = Encoding.ASCII.GetBytes(postData);
   client.Headers.Add("Content-Type", "pplication/x-www-form-urlencoded");
   byte[] reponseArray = client.UploadData("http://localhost:6355/SymptomTopics/BuildPreview",postArray);
   var result = Encoding.ASCII.GetString(reponseArray);
   return result;
}

Here is the Action I am calling

public ActionResult BuildPreview(string hwid, string label, string interchange, string localization) { ... }

When this Action is reached all the parameters are null.

I have tried using the WebClient.UploadValue() and passing the data as a NameValueCollection. This method always returns a status of 500 and because I am making this http request from within the MVC application I cannot find a way to bebug this.

Any help getting this resolved would be super helpful.

-Nick

I corrected the Header to read:

client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");

Now UploadData just errors immediately with with server error 500.

your content type looks broken. You're missing an 'a' at the front of pplication/x-www-form-urlencoded. — Alastair Pitts
– Alastair Pitts, Commented Jun 9, 2011 at 2:52
Thanks.. so when I correct my typo UploadData() just errors with a 500 — Nick
– Nick, Commented Jun 9, 2011 at 3:04
My route looks just like this: routes.MapRoute( "BuildPreview", "SymptomTopics/BuildPreview/{hwid}/{label}/{localization}", new { controller = "SymptomTopics", action = "BuildPreview"} ); — Nick
– Nick, Commented Jun 9, 2011 at 14:47

Eben Roux · Accepted Answer · 2011-06-09 04:28:50Z

5

Just for laughs have a look in Request.Form and the RouteData in your controller to see if something ended up there.

answered Jun 9, 2011 at 4:28

Eben Roux

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1 Comment

jonprasetyo Over a year ago

Agree, should be the accepted answer. Here is an example for newbies: string somethingFromAField = Request.Form.Get("someTextField"); - the "someTextField" is from the form that we just sent

Nick · Accepted Answer · 2011-06-10 13:20:59Z

3

I was able to get the post xml data from the Request objects InputStream property.

      public ActionResult BuildPreview(string hwid, string label, string localization)
         {
             StreamReader streamReader = new StreamReader(Request.InputStream);
             XmlDocument xmlDocument = new XmlDocument();
             xmlDocument.LoadXml(streamReader.ReadToEnd());
               ... 

 }

answered Jun 10, 2011 at 13:20

Nick

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Jedidja · Accepted Answer · 2011-06-09 04:29:18Z

2

As a stop-gap measure, you can always change your controller action to accept a FormCollection parameter and then reach in and access the form parameters by name directly.

answered Jun 9, 2011 at 4:29

Jedidja

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Michael Olesen · Accepted Answer · 2014-08-15 00:53:11Z

1

To get the raw posted bytes from WebClient.UploadData("http://somewhere/BuildPreview", bytes)

public ActionResult BuildPreview()
{
    byte[] b;
    using (MemoryStream ms = new MemoryStream())
    {
        Request.InputStream.CopyTo(ms);
        b = ms.ToArray();
    }

    ...
}

answered Aug 15, 2014 at 0:53

Michael Olesen

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