HttpWebRequest Vs HttpClient

Question

tengo un trozo de código que funciona usando la HttpWebRequest y HttpWebResponse pero me gustaría convertirlo a utilizar HttpClient y HttpResponseMessage.

Este es el trozo de código que funciona ...

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(serviceReq); 

request.Method = "POST"; 
request.ContentType = "text/xml"; 
string xml = @"<?xml version=""1.0""?><root><login><user>flibble</user>" + 
    @"<pwd></pwd></login></root>"; 
request.ContentLength = xml.Length; 
using (StreamWriter dataStream = new StreamWriter(request.GetRequestStream())) 
{ 
    dataStream.Write(xml); 
    dataStream.Close(); 
} 

HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 

Y este es el código que me gustaría reemplazarlo con, si tan sólo pudiera conseguir que funcione.

/// <summary> 
/// Validate the user credentials held as member variables 
/// </summary> 
/// <returns>True if the user credentials are valid, else false</returns> 
public bool ValidateUser() 
{ 
    bool valid = false; 

    try 
    { 
     // Create the XML to be passed as the request 
     XElement root = BuildRequestXML("LOGON"); 

     // Add the action to the service address 
     Uri serviceReq = new Uri(m_ServiceAddress + "?obj=LOGON"); 


     // Create the client for the request to be sent from 
     using (HttpClient client = new HttpClient()) 
     { 
      // Initalise a response object 
      HttpResponseMessage response = null; 

      // Create a content object for the request 
      HttpContent content = HttpContentExtensions. 
       CreateDataContract<XElement>(root); 

      // Make the request and retrieve the response 
      response = client.Post(serviceReq, content); 

      // Throw an exception if the response is not a 200 level response 
      response.EnsureStatusIsSuccessful(); 

      // Retrieve the content of the response for processing 
      response.Content.LoadIntoBuffer(); 

      // TODO: parse the response string for the required data 
      XElement retElement = response.Content.ReadAsXElement(); 
     } 
    } 
    catch (Exception ex) 
    { 
     Log.WriteLine(Category.Serious, 
      "Unable to validate the Credentials", ex); 
     valid = false; 
     m_uid = string.Empty; 
    } 

    return valid; 
} 

Creo que el problema está creando el objeto de contenido y el XML no se está conectado correctamente (tal vez).

Answer 1

Me gustaría saber la razón por la que el enfoque no funciona y el otro hace, pero acabo de Don No tengo tiempo para cavar más. {: O (

De todos modos, esto es lo que encontré

Un fallo se produce cuando se crea el contenido de la solicitud utilizando la siguiente

HttpContent content = HttpContentExtensions.Create(root, Encoding.UTF8, "text/xml"); 

pero funciona correctamente cuando se crea el contenido similares. esto ...

HttpContent content = HttpContent.Create(root.ToString(), Encoding.UTF8, "text/xml"); 

La función de trabajo final es la siguiente:

/// <summary> 
/// Validate the user credentials held as member variables 
/// </summary> 
/// <returns>True if the user credentials are valid, else false</returns> 
public bool ValidateUser() 
{ 
    bool valid = false; 

    try 
    { 
     // Create the XML to be passed as the request 
     XElement root = BuildRequestXML("LOGON"); 

     // Add the action to the service address 
     Uri serviceReq = new Uri(m_ServiceAddress + "?obj=LOGON"); 

     // Create the client for the request to be sent from 
     using (HttpClient client = new HttpClient()) 
     { 
      // Initalise a response object 
      HttpResponseMessage response = null; 

      #if DEBUG 
      // Force the request to use fiddler 
      client.TransportSettings.Proxy = new WebProxy("127.0.0.1", 8888); 
      #endif 

      // Create a content object for the request 
      HttpContent content = HttpContent.Create(root.ToString(), Encoding.UTF8, "text/xml"); 

      // Make the request and retrieve the response 
      response = client.Post(serviceReq, content); 

      // Throw an exception if the response is not a 200 level response 
      response.EnsureStatusIsSuccessful(); 

      // Retrieve the content of the response for processing 
      response.Content.LoadIntoBuffer(); 

      // TODO: parse the response string for the required data 
      XElement retElement = response.Content.ReadAsXElement(); 
     } 
    } 
    catch (Exception ex) 
    { 
     Log.WriteLine(Category.Serious, "Unable to validate the user credentials", ex); 
     valid = false; 
     m_uid = string.Empty; 
    } 

    return valid; 
} 

Gracias.

Answer 2

HttpClient.Post El método tiene una sobrecarga que toma un parámetro contentType, intente esto:

// Make the request and retrieve the response 
response = client.Post(serviceReq, "text/xml", content);