private void OnSelectDirectoryDialogMessage(SelectDirectoryDialogMessage msg)
{
var dialog = new FolderBrowserDialog();
var result = dialog.ShowDialog();
msg.Path = dialog.SelectedPath;
}
public Task ExportAsync(IEnumerable <AnonymousStudent> students)
{
var msg = new SelectDirectoryDialogMessage();
messenger.Send(msg);
if (string.IsNullOrEmpty(msg.Path))
{
messenger.Send(new DialogMessage {
Title = "Vorgang abgebrochen", Header = "Export abgebrochen", Text = "Es wurden keine Daten exportiert."
});
return(Task.CompletedTask);
}
return(Task.Run(() =>
{
var grades = students.Select(s => s.Grade).Distinct().ToList();
var i = 0;
foreach (var grade in grades)
{
OnRaiseProgressChangedEvent(new ProgressChangedEventArgs(i, grades.Count, $"Exportiere CSV-Dateien ({i + 1}/{grades.Count})..."));
var path = Path.Combine(msg.Path, string.Format(FileFormat, grade));
var studentsInGrade = students.Where(s => s.Grade == grade).ToList();
using (var writer = new StreamWriter(path, false, Encoding.UTF8))
{
using (var csv = new CsvWriter(writer))
{
csv.WriteRecords(studentsInGrade);
}
}
i++;
}
}));
}
