private void ClearThePage()
{
ListOfExercises.ClearValue(LongListMultiSelector.ItemsSourceProperty);
ListOfExercises.ClearValue(LongListMultiSelector.ItemTemplateProperty);
DataContext = null;
_viewModel.ValidationError -= _viewModel_ValidationError;
_viewModel = null;
}
private void CheckIfEditOrAddActionRequiredAsync()
{
string action;
if (NavigationContext.QueryString.TryGetValue("action", out action))
{
if (action == "edit")
{
string trIdStr;
int trId;
if (NavigationContext.QueryString.TryGetValue("trId", out trIdStr) && Int32.TryParse(trIdStr, out trId))
{
_trToEdit = App.FitAndGymViewModel.GetTrainingById(trId);
if (_trToEdit != null)
{
_viewModel = new TrainingPageViewModel(_trToEdit);
DataContext = _viewModel;
}
else
throw new Exception(String.Format("Not found Training with id = {0} in database invoked from TrainingPage!", trId));
}
else
throw new Exception("Wrong NavigationContext.QueryString 'trId' in TrainingPage");
}
else if (action == "add")
{
_viewModel = new TrainingPageViewModel();
DataContext = _viewModel;
}
else
throw new Exception(String.Format("Wrong NavigationContext.QueryString (action) in TrainingPage. Action = '{0}'", action));
_viewModel.ValidationError += _viewModel_ValidationError;
}
}
