Parameter has all propertys after webrequest - asp.net

Question

I have a really simple ASP.NET Api Controller with one method.
public HttpResponseMessage<User> Post(User user)
{
return new HttpResponseMessage<User>(new User() { Name = "New User at Server" });
}
My debugger says that the method is called but the problem is that the parameter "user" has all its content set to null; I am using Fiddler to look at request and response.. and all looks good.
This is my service code in the client.
public void AddUser(Models.User user, Action<Models.User> ShowResult)
{
var uiThreadScheduler = TaskScheduler.FromCurrentSynchronizationContext();
string url = "http://localhost:4921/User";
Uri uri = new Uri(url, UriKind.Absolute);
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
var sendWebPost = Task.Factory.FromAsync<Stream>(request.BeginGetRequestStream, request.EndGetRequestStream, null)
.ContinueWith(task =>
{
Tuple<string, string>[] stringToSend = { Tuple.Create<string, string>("user", ObjectToJson<Models.User>(user)) };
var bytesToSend = GetRequestBytes(stringToSend);
using (var stream = task.Result)
stream.Write(bytesToSend, 0, bytesToSend.Length);
}
).ContinueWith(task =>
{
Task.Factory.FromAsync<WebResponse>(request.BeginGetResponse, request.EndGetResponse, null)
.ContinueWith<WebResponse>(task2 => { ValidateResponse(task2); return task2.Result; })
.ContinueWith<Models.User>(task3 => {return JsonToObject<Models.User>(task3);})
.ContinueWith(task4 => { TryClearWorking(); ShowResult(task4.Result); }, uiThreadScheduler);
});;
}
public static string ObjectToJson<T>(T obj) where T : class
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(T));
MemoryStream stream = new MemoryStream();
StreamReader sr = new StreamReader(stream);
serializer.WriteObject(stream, obj);
sr.BaseStream.Position = 0;
string jsonString = sr.ReadToEnd();
return jsonString;
}
protected static byte[] GetRequestBytes(Tuple<string, string>[] postParameters)
{
if (postParameters == null || postParameters.Length == 0)
return new byte[0];
var sb = new StringBuilder();
foreach (var key in postParameters)
sb.Append(key.Item1 + "=" + key.Item2 + "&");
sb.Length = sb.Length - 1;
return Encoding.UTF8.GetBytes(sb.ToString());
}
Anyone who can give me some ideas where to start to look for errors.....

Answer 1

You need to set the Content-Length header.