Common class for HttpWebRequests - WP8 - windows-phone-8

Question

For making the http calls I use the functions
private void DoneClicked(object sender, RoutedEventArgs e)
{
string emailText = emailTBox.Text;
string oldPass = oldPasswordPBox.Password;
string newPass = newPasswordPBox.Password;
if (emailText == "" || oldPass == "" || newPass == "")
{
PassDiaTB1.Text = "Oops..";
PassDiaTB2.Text = "Some field is empty";
PassiveDialogs.Visibility = System.Windows.Visibility.Visible;
}
else
{
var data = new { user = new { email = emailText, old_password = oldPass, new_password = newPass } };
jsonStringChild = JsonConvert.SerializeObject(data, Formatting.Indented);
Debug.WriteLine(jsonStringChild);
string uri = CycleManager.HTTP_URI + "change-password";
var request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = CycleManager.HTTP_PUT;
request.ContentType = "application/json";
request.Accept = "application/json";
bool IsNetWork = System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable();
if (!IsNetWork)
{
PassDiaTB1.Text = "Oops..";
PassDiaTB2.Text = "Check your internet connectivity";
PassiveDialogs.Visibility = System.Windows.Visibility.Visible;
}
else
{
request.BeginGetRequestStream(new AsyncCallback(PostCallBack), request);
}
}
}
void PostCallBack(IAsyncResult result)
{
// End the stream request operation
HttpWebRequest request = result.AsyncState as HttpWebRequest;
Stream postStream = request.EndGetRequestStream(result);
byte[] byteArray = Encoding.UTF8.GetBytes(jsonStringChild);
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Close();
request.BeginGetResponse(new AsyncCallback(GetResponseStreamCallBack), request);
}
void GetResponseStreamCallBack(IAsyncResult callBackResult)
{
try
{
HttpWebRequest request = callBackResult.AsyncState as HttpWebRequest;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(callBackResult);
statusCode = (int)response.StatusCode;
if (statusCode == 200)
{
string result = "";
using (StreamReader httpWebStreamReader = new StreamReader(response.GetResponseStream()))
{
result = httpWebStreamReader.ReadToEnd();
}
string json = result;
Dictionary<string, string> token = JsonConvert.DeserializeObject<Dictionary<string, string>>(json);
string email = token["email"];
string auth_token = token["auth_token"];
CycleManager cycMan = CycleManager.Instance;
cycMan.AuthToken = auth_token;
Dispatcher.BeginInvoke(ShowPassiveDialog);
}
}
catch (WebException e)
{
if (e.Response != null)
{
HttpWebResponse aResp = e.Response as HttpWebResponse;
if (aResp != null)
{
statusCode = (int)aResp.StatusCode;
}
if (statusCode == 401)
{
string result = "";
using (StreamReader httpWebStreamReader = new StreamReader(aResp.GetResponseStream()))
{
result = httpWebStreamReader.ReadToEnd();
}
string json = result;
var definition = new { message = "" };
var parsedStrings = JsonConvert.DeserializeAnonymousType(json, definition);
message = parsedStrings.message;
Dispatcher.BeginInvoke(ShowPassiveDialog);
}
if (statusCode == 500)
{
string result = "";
using (StreamReader httpWebStreamReader = new StreamReader(aResp.GetResponseStream()))
{
result = httpWebStreamReader.ReadToEnd();
}
string json = result;
var definition = new { message = "" };
var parsedStrings = JsonConvert.DeserializeAnonymousType(json, definition);
message = parsedStrings.message;
Dispatcher.BeginInvoke(ShowPassiveDialog);
}
}
}
}
The same three calls are made in several pages, changing the parameters and methods. I am trying to create a common class which can be called to make http calls. But these functions have differnt return types and I'm not able generalize all this??
Any help would be appreciated.

Answer 1

May this will guide you. I create a wrapper class for such kind of work, its help me a lot and reduce lots of code and effort.
public class CommanHttpRequest
{
private string ACCEPT="application/json";
private string ContentType ="application/json";
private string POST_METHOD="POST";
private string GET_METHOD="GET";
public string IsException { get; set; }
public HttpWebRequest GetHttpRequest(string url,string header1, string header2)
{
HttpWebRequest getRequest = HttpWebRequest.CreateHttp(url);
getRequest.Accept =this.ACCEPT;
getRequest.ContentType = this.ACCEPT;
getRequest.Headers["Header1"] = header1;
getRequest.Headers["Header2"] = header2;
getRequest.Method = this.POST_METHOD;
return getRequest ;
}
public void GetRequestResponse(Action<your type> callback, IAsyncResult asyncResult, string envelop)
{
try
{
UTF8Encoding encoding = new UTF8Encoding();
HttpWebRequest request = (HttpWebRequest)asyncResult.AsyncState;
Stream body = request.EndGetRequestStream(asyncResult);
//write body if any
byte[] formBytes = encoding.GetBytes(envelop);
body.Write(formBytes, 0, formBytes.Length);
body.Close();
request.BeginGetResponse(result =>
{
try
{
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(result);
using (Stream data = response.GetResponseStream())
{
using (var reader = new StreamReader(data))
{
string jsonString = reader.ReadToEnd();
MemoryStream memoryStream = new MemoryStream(Encoding.Unicode.GetBytes(jsonString));
DataContractJsonSerializer dataContractJsonSerializer = new DataContractJsonSerializer(typeof(your type));
var parseddata = dataContractJsonSerializer.ReadObject(memoryStream) as your type;
callback(parseddata );
}
}
}
catch (WebException ex)
{
IsException = ex.Message;
//I asume your type =List<abc>();
callback(new List<abc>());
}
}, request);
}
catch (Exception ex)
{
IsException = ex.Message;
callback(new List<abc>());
}
}
}
public class abc
{
public void TestRequest()
{
string url="some url";
CommanHttpRequest requestObj = new CommanHttpRequest();
HttpWebRequest testRequest = _requestObj.GetHttpRequest(url, password, email);
//if there some body in request
string envelope = "{\"requestType\":" + requestType + "}";
testRequest .BeginGetRequestStream(result =>
{
requestObj.GetRequestResponse(resultData =>
{
ProcessServiceResponse(resultData);
}, result, envelope);
}, testRequest );
}
public void ProcessServiceResponse(List<abc> abcdata)
{
//abcdata is your data
}
}