private PropertyTask<ReadOnlyCollectionShortcut<SavedListConfigViewModel>> EnsureConfigsTask()
{
if (_configsTask != null) return _configsTask;
return _configsTask = new PropertyTask<ReadOnlyCollectionShortcut<SavedListConfigViewModel>>(
notifier: () =>
{
OnPropertyChanged("Configs");
OnPropertyChanged("ConfigsAsync");
},
createTask: () =>
{
var ctx = ViewModelFactory.CreateNewContext();
var qryTask = ctx.GetQuery<SavedListConfiguration>()
.Where(i => i.Type.ExportGuid == Parent.DataType.ExportGuid) // Parent.DataType might be from FrozenContext
.Where(i => i.Owner == null || i.Owner.ID == this.CurrentPrincipal.ID)
.ToListAsync();
var result = new ZbTask<ReadOnlyCollectionShortcut<SavedListConfigViewModel>>(qryTask);
result
.OnResult(t =>
{
t.Result = new ReadOnlyCollectionShortcut<SavedListConfigViewModel>();
foreach (var cfg in qryTask.Result)
{
var obj = cfg.Configuration.FromXmlString<SavedListConfigurationList>();
foreach (var item in obj.Configs)
{
t.Result.Rw.Add(ViewModelFactory.CreateViewModel<SavedListConfigViewModel.Factory>().Invoke(DataContext, this, item, cfg.Owner != null));
}
}
})
.Finally(() => ctx.Dispose());
return result;
},
set: null);
}
private void TriggerPossibleValuesROAsync()
{
if (_getPossibleValuesROTask == null)
{
var task = GetPossibleValuesAsync();
_getPossibleValuesROTask = new ZbTask<ReadOnlyObservableCollection<TagEntryViewModel>>(task);
_getPossibleValuesROTask.OnResult(t =>
{
_possibleValues = new ObservableCollection<TagEntryViewModel>(task.Result);
_possibleValuesRO = new ReadOnlyObservableCollection<TagEntryViewModel>(_possibleValues);
EnsureValuePossible(Value);
OnPropertyChanged("PossibleValuesAsync");
OnPropertyChanged("FilteredPossibleValuesAsync");
});
}
}