async void retrieveSurvey()
{
activityIndicator.IsVisible = true;
activityIndicator.IsRunning = true;
//Retrieve list of survey from server
string httpTask = await Task.Run <string>(() => HttpRequestHandler.PostGetSurveys());
while (httpTask == null)
{
httpTask = await Task.Run <string>(() => HttpRequestHandler.PostGetSurveys());
}
if (httpTask != null)
{
List <Survey> surveyList = JsonConvert.DeserializeObject <List <Survey> >(httpTask.ToString());
//If surveys is available, get the survey details, else display the error message
if (surveyList != null)
{
for (int i = 0; i < surveyList.Count(); i++)
{
//Get survey details
string surveyID = surveyList[i].surveyID;
string surveydescription = surveyList[i].description;
string httpTaskquestions = await Task.Run <string>(() => HttpRequestHandler.PostGetSurveyQuestions(surveyList[i].surveyID));
while (httpTaskquestions == null)
{
httpTaskquestions = await Task.Run <string>(() => HttpRequestHandler.PostGetSurveyQuestions(surveyList[i].surveyID));
}
//if survey question is available, get the list of questions for this particular survey
if (httpTaskquestions != null)
{
surveyList[i].surveyQuestions = JsonConvert.DeserializeObject <List <surveyQuestion> >(httpTaskquestions.ToString());
}
}
activityIndicator.IsVisible = false;
activityIndicator.IsRunning = false;
pageTitle.IsVisible = true;
listView.ItemsSource = surveyList;
}
}
}
