private void UpdateTypeCategories(IEnumerable <int> SelectedCategories, ServiceType serviceType)
{
List <Category> selectedCategories = (SelectedCategories == null || !SelectedCategories.Any()) ?
new List <Category>() :
CategoryRepository.Items.Where(s => SelectedCategories.Contains(s.Id)).ToList();
IEnumerable <Category> categorySet = selectedCategories.Union(serviceType.Categories.ToArray());
foreach (Category category in categorySet)
{
if (!selectedCategories.Contains(category))
{
ServiceTypeRepository.DeleteLink(serviceType, category);
}
else if (!serviceType.Categories.Contains(category))
{
ServiceTypeRepository.AddLink(serviceType, category);
}
}
}