像WCF Rest Service中的HttpWebRequest对象一样传递XML

Question

我正在尝试将HTTPWebRequest POST XML数据发送到我的WCF服务。     但是，当我在我的服务中设置断点时，它会被击中，但是当我尝试读取它时，我的widgetStream是空的。即使我从StreamReader中读取它。     这是我的XMl文件发送到WCF Rest Service中的HttpWebRequest ..

    <UserInput xmlns="http://localhost/lms">       
      <City>Hyderabad</City>
      <State>AP</State>
      <ZipCode>500016</ZipCode>
      <Country>Inida</Country>
      <Telephone>9293225135</Telephone>
      <Fax>9293225135</Fax>  
      <RegisteredOn>01/02/2012</RegisteredOn>
      <ApprovedOn>03/03/2012</ApprovedOn>
      <Status>1</Status>
    </UserInput>

但是我得到了以下的反响......

    <UserInput xmlns="http://localhost/lms" xmlns:i="http://www.w3.org/2001/XMLSchema"/>

这有什么问题...

string url = "http://localhost:2617/UserService.svc/user";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "PUT";
req.ContentType = "application/xml";
//req.context.ContextOptions.ProxyCreationEnabled = false;

System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
xmlDoc.XmlResolver = null;
xmlDoc.Load(Server.MapPath("test.xml"));
string sXML = xmlDoc.InnerXml;
req.ContentLength = sXML.Length;
System.IO.StreamWriter sw = new 
sw.Write(sXML);
sw.Close();