AcManager.Pages.Dialogs.SelectCarDialog.UpdateTunableVersions C# (CSharp) Метод

        private void UpdateTunableVersions() {
            if (_selectedCar == null) {
                TunableVersions.Clear();
                HasChildren = false;
                _previousTunableParent = null;
                return;
            }

            var parent = SelectedCar.ParentId == null ? SelectedCar : SelectedCar.Parent;
            if (parent == _previousTunableParent) {
                return;
            }

            if (parent == null) {
                TunableVersions.Clear();
                HasChildren = false;
                _previousTunableParent = null;
                return;
            }

            _previousTunableParent = parent;
            
            var children = parent.Children.Where(x => x.Enabled).ToList();
            HasChildren = children.Any();
            if (!HasChildren) {
                TunableVersions.Clear();
                return;
            }

            TunableVersions.ReplaceEverythingBy(new [] { parent }.Where(x => x.Enabled).Union(children));
            if (SelectedTunableVersion == null) {
                SelectedTunableVersion = SelectedCar;
            }
        }