public IEnumerable <Order> FindAllCustomersOrdersBy(Guid customerId)
{
IEnumerable <Order> customerOrders = new List <Order>();
Query query = new Query();
//字符串
//query.Add(new Criterion("CustomerId", customerId, CriteriaOperator.Equal));
//Lambda
query.Add(Criterion.Createe <Order>(o => o.CustomerId, customerId, CriteriaOperator.Equal));
query.OrderByProperty = new OrderByClause("CustomerId", true);
customerOrders = _orderRepository.FindBy(query);
return(customerOrders);
}