private async void InternalAnonymize(IEnumerable <AnonymousStudent> students)
{
try
{
IsBusy = true;
BusyProgress = null;
BusyMessage = "Anonymisiere ausgewählte Schüler...";
// Create a working copy of all students (because we want to update the UI afterwards)
var allStudents = Students.ToList();
var selectedStudents = SelectedStudents.ToList();
SelectedStudents.Clear();
Students.Clear();
await Task.Factory.StartNew(() =>
{
var currentStudentIdx = 0;
var studentsCount = (double)students.Count();
foreach (var student in students)
{
int attempt = 0;
do
{
studentFaker.FakeStudent(student, attempt);
attempt++;
} while (Students.Count(x => x.AnonymousEmail == student.AnonymousEmail) > 1); // Ensure email addresses are unique!
dataSource.UpdateStudent(student);
// Update progressbar
dispatcher.RunOnUI(() => BusyProgress = (currentStudentIdx / studentsCount) * 100);
currentStudentIdx++;
}
}, TaskCreationOptions.LongRunning);
BusyProgress = null;
BusyMessage = "Speichere Änderungen in der internen Datenbank...";
await dataSource.SaveChangesAsync();
Students.AddRange(allStudents);
SelectedStudents.AddRange(selectedStudents);
}
catch (Exception e)
{
Messenger.Send(new ErrorDialogMessage {
Exception = e, Title = "Fehler", Header = "Fehler beim Anonymisieren der Schüler", Text = "Beim Anonymisieren der Schüler ist ein Fehler aufgetreten."
});
}
finally
{
IsBusy = false;
}
}
private void AnomyizeSelectedStudents()
{
InternalAnonymize(SelectedStudents.ToList());
}