private void GetCategories()
{
int index = -1;
if (SelectedCategory != null)
{
index = CategoriesList.IndexOf(SelectedCategory);
}
CategoriesList.Clear();
try
{
CategoriesList = new ObservableCollection <CategoryModel>(storageHandler.GetCategories());
}
catch (FileNotFoundException ex)
{ MessageBox.Show($"File not found {ex.Message}."); }
catch (InvalidOperationException ex)
{ MessageBox.Show($"Can't read data from file {ex.Message}."); }
catch (Exception ex)
{ MessageBox.Show($"Something is wrong {ex.Message}."); }
OnPropertyChanged(nameof(CategoriesList));
if (index > -1 && index < CategoriesList.Count)
{
SelectedCategory = CategoriesList[index];
}
else
{
SelectedCategory = null;
}
OnPropertyChanged(nameof(SelectedCategory));
}