Server response / callback after Silverlight file upload

Question

Ok first of all, the unicorn avatars are hilarious. Seriously, I thought my account was compromised. Happy April Fool's day.

Now I'm uploading files via Silverlight to the server. What is the best way to notify Silverlight that the files have been uploaded? Perhaps even toss other information back such as success/failure etc.

I followed a simple tutorial here for my file upload logic

Answer 1

First of all re-write the UploadFile function as follows:-

    private void UploadFile(string fileName, Stream data, Action<Exception> callback)
    {
        UriBuilder ub = new UriBuilder("http://localhost:3840/receiver.ashx");
        ub.Query = string.Format("filename={0}", fileName);

        WebClient c = new WebClient();
        c.OpenWriteCompleted += (sender, e) =>
        {
            try
            {
              PushData(data, e.Result);
              e.Result.Close();
              data.Close();  // This blocks until the upload completes
              callback(null);
            }
            catch (Exception er)
            {
              callback(er);
            }
        };
        c.OpenWriteAsync(ub.Uri);
    }

Now you can use this function like this:-

   Stream data = new fi.OpenRead();
   try
   {        
       FileUpload(fi.Name, data, (err) => 
        {
           // Note if you want to fiddle with the UI use dispatcher Invoke here.
           if (err == null)
           {
              // Success
           }
           else
           {
              // Fail do something with the err to disply why
           }
        });

    }
    catch
    {
        data.Dispose();
    }