public MainViewModel()
{
Homeworks.Add(new Homework {
Name = "Ukol1", Date = new DateTime(2020, 3, 27), Subject = Subject.PRG, IsDone = false
});
Homeworks.Add(new Homework {
Name = "Ukol2", Date = new DateTime(2020, 3, 28), Subject = Subject.CJL, IsDone = false
});
Add = new RelayCommand(
() => { Homeworks.Add(new Homework {
Name = "Nový úkol"
}); },
() => true
);
Remove = new RelayCommand(
() => { Homeworks.Remove(SelectedHomework); },
() => { return(SelectedHomework != null); }
);
Load = new RelayCommand(
async() => {
try
{
string serializedSourceText = await Windows.Storage.FileIO.ReadTextAsync(File);
Homeworks = JsonSerializer.Deserialize <ObservableCollection <Homework> >(serializedSourceText);
}
catch (Exception ex)
{
var messageDialog = new MessageDialog("Error: " + ex.Message); // vyhození dialogu odsud není ideální, ale funguje
await messageDialog.ShowAsync();
}
},
() => true
);
Save = new RelayCommand(
async() => {
try
{
string serializedData = JsonSerializer.ToJsonString(Homeworks);
await Windows.Storage.FileIO.WriteTextAsync(File, serializedData);
/* pokusně přes stream
* var stream = await File.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
* using (var outputStream = stream.GetOutputStreamAt(0))
* {
* using (var dataWriter = new Windows.Storage.Streams.DataWriter(outputStream))
* {
* dataWriter.WriteString(JsonSerializer.ToJsonString(_students));
* await dataWriter.StoreAsync();
* await outputStream.FlushAsync();
* }
* }
* stream.Dispose();
*/
}
catch (Exception ex)
{
var messageDialog = new MessageDialog("Error: " + ex.Message);
await messageDialog.ShowAsync();
}
},
() => true
);
}
public void Remove(string teacher, string name, string start, string end)
{
Homeworks h = new Homeworks();
h.Remove(h.Homework.Single(hw => hw.Teacher == teacher && hw.Name == name && hw.Start == start.Replace('-', '/').Replace('.', ':') && hw.End == end.Replace('-', '/').Replace('.', ':')));
}