运行NHibernate查询而不加入

不管怎样,延迟加载都会自动完成,您是否在尝试避免延迟加载?为什么?

IList<Customer> customers = _session.CreateCriteria<Customer>().List<Customer>();

只会给你所有的顾客。只有在调用客户实体上的订单集合时,才会从数据库中提取订单,例如:

foreach(Customer customer in customers)
{
    IList<Order> orders = customer.Orders; // Will hit the database
}

更新: 对评论的回应。如果通过web服务发送POCO,您应该考虑使用报表查询,因为POCO会丢失对NHibernate会话对象的附件,因此延迟加载将不起作用(Orders collection将只返回NULL)。换句话说,正确调用web服务的“thing”不会了解任何有关NHibernate或域模型的信息,因此:

public IList<CustomerView> GetAllCustomers()
{
    return (from c in _session.Query<Customer>()
            select new CustomerView()
            {
                Id = c.Id,
                Name = c.Name
            }).ToList();
}

public CustomerDetail GetCustomerFromId(int id)
{
    return (from c in _session.Query<Customer>()
            where c.Id == id
            select new CustomerDetail()
            {
                Id = c.Id,
                Name = c.Name
                FullAddress = c.FormatFullAddress(),
                Orders = c.Orders,
                // other properties (snip)
            }).SingleOrDefault();
}

http://nhibernate.info/doc/nh/en/index.html#querycriteria-projection

您可以在条件中指定FetchMode:

var crit = session.CreateCriteria (typeof(SomeObject));
crit.SetFetchMode ("association", FetchMode.Eager);