private async Task Save()
{
foreach (var noteViewModel in this.Notes)
{
noteViewModel.Note.Description = noteViewModel.Description;
}
var removedIds = _token.Notes
.Where(note => note.Id != default && Notes.All(model => model.Note.Id != note.Id))
.Select(entity => entity.Id)
.ToList();
var notesToRemove = _context.Set <NoteEntity>().Where(entity => removedIds.Contains(entity.Id));
_context.Set <NoteEntity>().RemoveRange(notesToRemove);
var added = this.Notes.Where(model => model.Note.Id == default).Select(model => model.Note);
_context.Set <NoteEntity>().AddRange(added);
var changed = this.Notes
.Where(model => model.Note.Id != default)
.Select(model => model.Note)
.ToDictionary(entity => entity.Id);
var changedIds = changed.Keys.ToList();
var noteEntities = _context.Set <NoteEntity>().Where(entity => changedIds.Contains(entity.Id)).ToList();
noteEntities.ForEach(entity => entity.Apply(changed[entity.Id]));
await _context.SaveChangesAsync();
_token.Deactivate();
}
