public static bool OlderThan(this UserModel userModel, int threshold)
{
var specification = new OlderThanSpecification(threshold);
bool result = specification.IsSatisfied(userModel);
return(result);
}
public static IQueryable <UserModel> OlderThan(this IQueryable <UserModel> userModels, int threshold)
{
var specification = new OlderThanSpecification(threshold);
return(userModels.Where(specification.Expression));
}