不能将NHIBERNATE代码映射用于私有字段

Question

以下流利的NHIBERNATE代码的等效NHIBERNATE代码映射是什么：

Map(x => x.Orders).Access.CamelCaseField(Prefix.Underscore);

我整个下午都在试图让它上班。到目前为止，这是我的代码：

public class Customer
{
    private readonly IList<Order> _orders = new List<Order>();
    public virtual Guid ID { get; set; }
    public virtual string LastName { get; set; }
    public IEnumerable<Order> Orders 
    {
        get { foreach (var order in _orders) yield return order; }
    }
    internal void AddOrder(Order order)
    {
        _orders.Add(order);
    }
}  
public class CustomerMap : ClassMapping<Customer>
{
    public CustomerMap()
    {
        Id<Guid>(x => x.Id);
        Component(x => x.LastName, y =>
        {
            y.Property<string>(z => z.LastName);
        });
        Bag(x => x._orders, collectionMapping =>
        {
            collectionMapping.Table("CustomerOrders");
            collectionMapping.Cascade(Cascade.None);
            collectionMapping.Key(k => k.Column("CustomerId"));
        },
        map => map.ManyToMany(p => p.Column("OrderId")));
    }
}

这回答了我的问题：https：//groups.google.com/forum/# !! topic/nhusers/wih1dpgohgu。我尝试从我的链接复制和粘贴代码（请参见下文）：

  this.Bag(
                    r => "privatefieldtomap",
                    map =>
                        {
                            map.Access(Access.Field);
                            map.Table("table");
                            map.Key(k => k.Column("foreignkey"));
                        },
                    r => r.Element(m => m.Column("columntomap")));

我得到的错误是：无法从用法中推断出袋。

Answer 1

您有几个选项可以按代码映射不可见字段。

这里有些，请注意，我尚未按书面测试，但无论如何都应该为您提供帮助：

// Option 1:
public class CustomerMap : ClassMapping<Customer>
{
    public CustomerMap()
    {
        // ...
        Bag<Order>("_orders", collectionMapping =>
        {
            //...
        },
        map => map.ManyToMany(p => p.Column("OrderId")));
    }
}
// Option 2: No strings, but I'm not sure if this one would really work as is.
public class CustomerMap : ClassMapping<Customer>
{
    public CustomerMap()
    {
        // ...
        Bag(x => x.Orders, collectionMapping =>
        {
            collectionMapping.Access(Accessor.Field),
            //...
        },
        map => map.ManyToMany(p => p.Column("OrderId")));
    }
}
// Option 3: No strings, but more convoluted.
public class Customer
{
    internal class PrivatePropertyAccessors
    {
        public static Expression<Func<Customer, IEnumerable<Order>>> OrdersProperty = c => c._orders;
    }
    private readonly IList<Order> _orders = new List<Order>();
    public IEnumerable<Order> Orders
    {
        get { foreach (var order in _orders) yield return order; }
    }
}
public class CustomerMap : ClassMapping<Customer>
{
    public CustomerMap()
    {
        // ...
        Bag(Customer.PrivatePropertyAccessors.OrdersProperty, collectionMapping =>
        {
            //...
        },
        map => map.ManyToMany(p => p.Column("OrderId")));
    }
}

Answer 2

您可以使用命名策略：

cfg.SetNamingStrategy(myStrategy);

其中myStrategy是INamingStrategy的实现。请参阅我的博客文章，网址为https://weblogs.asp.net/ricardoperes/nhibernate-conventions