AuthSimpleResourceAuthorize.cs

public void DoSomething()
{
  // explicit access checking
  // HasRead is an extension method for UserPrincipal class
  if(User.HasRead("App.ResourceName") 
  {
    // do something if user has read access to App.Resource1
  }
}

// maybe some action decorator for asp.net web api or mvc
// by extending the authorize attribute, this method is never 
// called if user doesn't have proper access
[ResourceAuthorize("App.ResourceName", Action.Read)]
public IEnumerable<Item> GetAllItems()
{
  return new List<Item>();
}

// requires write permission
[ResourceAuthorize("App.ResourceName", Action.Write)]
public void SaveItem(Item item)
{
   _uow.Save(item);
}