I am doing a web request to login in a my web services and I have a problem. I need to wait until the login is finished before end the method that launchs the login because I need to return a boolean value that represents if the login was correct or not. In the following code I put a comment where I need wait for the result of "httpWebRequest.BeginGetResponse(...)"
public async Task<bool> login(string user, string passwrd)
{
mLoginData.setUserName(user);
mLoginData.setPasswd(passwrd);
string serviceURL = mBaseURL + "/pwpcloud/service/user/login";
//build the REST request
// HTTP web request
var httpWebRequest = (HttpWebRequest)WebRequest.Create(serviceURL);
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
// Write the request Asynchronously
using (var stream = await Task.Factory.FromAsync<Stream>(httpWebRequest.BeginGetRequestStream, httpWebRequest.EndGetRequestStream, null))
{
string parameters = "{\"username\":\"" + user + "\",\"password\":\"" + passwrd + "\"}";
byte[] byteArray = Encoding.UTF8.GetBytes(parameters);
// Write the bytes to the stream
await stream.WriteAsync(byteArray, 0, byteArray.Length);
}
//httpWebRequest.BeginGetResponse(new AsyncCallback(OnGettingLoginResponse), httpWebRequest);
httpWebRequest.BeginGetResponse(r =>
{
using (HttpWebResponse response = (HttpWebResponse)httpWebRequest.EndGetResponse(r))
{
string data;
// Read the response into a Stream object.
Stream responseStream = response.GetResponseStream();
using (var reader = new StreamReader(responseStream))
{
data = reader.ReadToEnd();
}
responseStream.Close();
if (response.StatusCode == HttpStatusCode.OK)
{
dynamic jsonData = JObject.Parse(data);
string token = jsonData.token;
mLoginData.setToken(token);
string userId = jsonData.userId;
mLoginData.setUserID(userId);
mLoginData.setLogged(true);
//guardamos los valores en el isolatedStorageSettings para que persistan.
App.settings.Clear();
App.settings.Add("userId", mLoginData.getUserID());
App.settings.Add("token", mLoginData.getToken());
App.settings.Add("userName", mLoginData.getUserName());
App.settings.Add("passwd", mLoginData.getPasswd());
App.settings.Add("logged", mLoginData.isLogged());
App.settings.Save();
}
else
{
if (CultureInfo.CurrentUICulture.Name.ToString().Contains("ES"))
{
if (response.StatusCode == HttpStatusCode.Unauthorized || response.StatusCode == HttpStatusCode.BadRequest)
{
MessageBox.Show("Usuario o contraseña incorrectos");
}
else
{
MessageBox.Show("Error de conexión.");
}
}
else
{
if (response.StatusCode == HttpStatusCode.Unauthorized || response.StatusCode == HttpStatusCode.BadRequest)
{
MessageBox.Show("User or password were incorrect");
}
else
{
MessageBox.Show("NNetwork connection error");
}
}
}
}
}, null);
//here i need wait for the result of the webrequest to return true if the login was successfull.
return mLoginData.isLogged();
}
I read a lot about this buf I didn't find the solution. Thanks everyone!!!
Just use the newer style of asynchrony:
using (var response = (HttpWebResponse) await request.GetResponseAsync())
{
...
}
You shouldn't need to call BeginXXX much now - certainly the Microsoft APIs have pretty universally added support for the Task-based Asynchronous Pattern.
If GetResponseAsync isn't available, use Task.Factory.FromAsync just as you have for BeginRequestStream:
var responseTask = Task.Factory.FromAsync<WebResponse>
(httpWebRequest.BeginGetResponse,
httpWebRequest.EndGetResponse,
null);
using (var response = (HttpWebResponse) await responseTask)
{
}
Note that because you're writing an async method, the initial method call will still finish quickly - but it will return a Task<bool> which will only complete when the async operation has completed. So you should probably be awaiting the result in the calling code, too.
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