WCF Post / WebRequest Works - WebClient Not

Question

I have a WCF service declared as follows:

[OperationContract, XmlSerializerFormat]
[WebInvoke(UriTemplate = "ProessUpload",
   BodyStyle = WebMessageBodyStyle.Bare,
   RequestFormat = WebMessageFormat.Xml)]
void ProcessUpload(ProductConfig stream);

I try to call this service using WebClient, but I always get a 400 (BadRequest) response from the server. However, if I use HttpWebRequest, WCF consumes my post and responds correctly with 200. I can also successfully build a request using Fiddler to call the WCF service.

WebClient Code

WebClient webClient = new WebClient();
webClient.Headers.Add("Content-Type", "application/xml");//; charset=utf-8
try
{
  string result = webClient.UploadString("http://jeff-laptop/SalesAssist.ImageService/Process", "POST", data2);
}
  catch (Exception ex)
{
  var e = ex.InnerException;
}

HttpWebRequest Code

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://jeff-laptop/SalesAssist.ImageService/Process");
request.ContentType = "application/xml";
request.Method = "POST";
request.KeepAlive = true;

using (Stream requestStream = request.GetRequestStream())
{
  var bytes = Encoding.UTF8.GetBytes(data2);
  requestStream.Write(bytes, 0, bytes.Length);
  requestStream.Close();
}

var response = (HttpWebResponse)request.GetResponse();
var abc = new StreamReader(response.GetResponseStream()).ReadToEnd();

XML shipped

var data2 = @"<Product><Sku>3327</Sku><NameProduct</Name><Category>Bumper</Category><Brand Id='3'><Collection>14</Collection></Brand></Product>";

Why does HttpWebRequest work, but WebClient doesn't? I see no real difference in the headers sent via Fiddler.

Answer 1

Encoding WebClient . , , ASCII. .

, . . , UploadStringAsync.

 webClient.Encoding = Encoding.UTF8;