private async Task <GradeObjectsList> GetGradesRemote(string sNummer, string rZLogin, string abschlNr, string stgNr, string pOVersion)
{
// TODO: Regex zum Prüfen der Werte
if (!sNummer.Equals("") && !rZLogin.Equals("") && !abschlNr.Equals("") && !stgNr.Equals("") && !pOVersion.Equals(""))
{
try {
string requestData = WebUtility.UrlEncode("sNummer") + "=" + WebUtility.UrlEncode(sNummer) + "&"
+ WebUtility.UrlEncode("RZLogin") + "=" + WebUtility.UrlEncode(rZLogin) + "&"
+ WebUtility.UrlEncode("AbschlNr") + "=" + WebUtility.UrlEncode(abschlNr) + "&"
+ WebUtility.UrlEncode("StgNr") + "=" + WebUtility.UrlEncode(stgNr) + "&"
+ WebUtility.UrlEncode("POVersion") + "=" + WebUtility.UrlEncode(pOVersion);
Uri uri = new Uri("https://wwwqis.htw-dresden.de/appservice/getgrades?" + requestData);
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.PostAsync(uri, new StringContent(""));
string content = await response.Content.ReadAsStringAsync();
Debug.WriteLine(content);
List <GradeObject> gradeObjects = JsonConvert.DeserializeObject <List <GradeObject> >(content);
GradeObjectsList gradeObjectsList = new GradeObjectsList();
gradeObjectsList.gradeObjects = gradeObjects;
gradeObjectsList.timestamp = DateTime.Now;
return(gradeObjectsList);
}
catch (Exception e) {
Debug.WriteLine(e.ToString());
return(null);
}
}
else
{
return(null);
}
}
/*
* Returns the number of new grades.
*/
public async Task <int> GetNewGradesCount(string sNummer, string rZLogin)
{
GradeObjectsList backupGrades = await LoadGradesBackup(sNummer);
GradeObjectsList newGrades = await GetGrades(sNummer, rZLogin);
if (backupGrades != null && newGrades != null)
{
int count = newGrades.gradeObjects.Count - backupGrades.gradeObjects.Count;
return(count >= 0 ? count : -1);
}
else
{
return(-1);
}
}
private async Task <bool> SaveGradesBackup(GradeObjectsList gradeObjectsList, string sNummer)
{
try {
StorageFile saveFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(filename + sNummer + ".xml", CreationCollisionOption.ReplaceExisting);
using (Stream writeStream = await saveFile.OpenStreamForWriteAsync()) {
DataContractSerializer serializer = new DataContractSerializer(typeof(GradeObjectsList));
serializer.WriteObject(writeStream, gradeObjectsList);
await writeStream.FlushAsync();
writeStream.Dispose();
}
return(true);
}
catch (Exception e) {
throw new Exception("Unable to save grades", e);
}
}