silverlight 4 file upload to mvc 3 controller HttpPostedFileBase is null - asp.net-mvc-3

Question

I have a mvc 3 page that I want to be able to upload images to my website using silverlight to do the uploading and present a progress bar and a cancel button as it uploads. But I keep getting null value in my controller for the HttpPostedFileBase argument.
Here is my silverlight upload code ...
var client = new WebClient();
client.Headers[HttpRequestHeader.ContentType] = "multipart/form-data";
client.OpenWriteCompleted += (sender1, e1) =>
{
PushData(stream, e1.Result);
e1.Result.Close();
stream.Close();
};
client.UploadProgressChanged += (sender1, e1) =>
{
this.pbStatus.Value = e1.ProgressPercentage;
};
// get uri from params
param = App.Current.Host.InitParams["url"];
var uri = new Uri(param, UriKind.Relative);
client.OpenWriteAsync(uri, "POST");
Push Data method ...
private void PushData(Stream input, Stream output)
{
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = input.Read(buffer, 0, buffer.Length)) != 0)
{
output.Write(buffer, 0, bytesRead);
}
}
And my controller code ...
[HttpPost]
public ActionResult UploadTexture(HttpPostedFileBase file)
{
}
The file param in my controller is null when the controller is called. Anyone know what I am doing wrong ?
I've seen examples that implement a IHttpHandler but I'm trying to avoid doing that and stick with just straight mvc 3 controllers.

Answer 1

I was having the same issue that you were. I was able to solve this issue another way.
foreach (FileInfo fi in uploadedFiles)
{
UriBuilder ub = new UriBuilder(Application.Current.Host.Source.Host + "/Excel/?fileName=" + fi.Name);
WebClient wc = new WebClient();
wc.Headers[HttpRequestHeader.ContentType] = "multipart/form-data";
wc.OpenWriteCompleted += (sender, e) =>
{
FileStream data = fi.OpenRead();
PushData(data, e.Result);
e.Result.Close();
data.Close();
};
wc.OpenWriteAsync(ub.Uri, "POST");
}
Main difference you will see is that I attach the filename to the URL. My PushData() is the same. On the MVC side, I have:
[HttpPost]
public ActionResult Index(string fileName)
{
using (FileStream fs = System.IO.File.Create(Server.MapPath("~/FilesExcel/" + fileName)))
{
SaveFile(Request.InputStream, fs);
}
return View();
}
private void SaveFile(Stream stream, FileStream fs)
{
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) != 0)
{
fs.Write(buffer, 0, bytesRead);
}
}