nhibernate <bag> 异常 - 非法访问加载集合

Question

我在尝试使用 NHibernate 填充供应商域中的“IList”属性时遇到“非法访问加载集合”异常。我已经尝试了通过谷歌搜索得到的所有建议，但似乎没有任何帮助:(

这是我的域对象和 .HBM 文件。非常感谢您的帮助/建议。

供应商域对象

namespace Inventory.DomainObjects
{
    [Serializable]
    public class Supplier
    {
        public virtual string SupplierID { get; set; }

        public virtual string Name { get; set; }
        public virtual string Description { get; set; }
        public virtual IList<Address> Address { get; set; }

    }
}

地址域对象

namespace Inventory.DomainObjects
{
    [Serializable]
    public class Address 
    {
        public virtual int AddressID { get; set; }
        public virtual string SupplierID { get; set; }

        public virtual string Line1 { get; set; }
        public virtual string Line2 { get; set; }
        public virtual string Line3 { get; set; }
    }
}

供应商.HBM

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   namespace="Inventory.DomainObjects"
                   assembly="Inventory">
  <class name="Supplier" table="Inv_Supplier">
    <id name="SupplierID" column="SupplierId" type="string"/>

    <property name="SupplierCode" column="Code" type="string"/>
    <property name="Name" column="SupplierName" type="string"/>
    <property name="Description" column="SupplierDescription" type="string"/>

    <bag name="Address" cascade="all" inverse="true" lazy="true">
      <key column="SupplierID" not-null="true"/>
      <one-to-many class="Address" not-found="ignore"/>
    </bag>

  </class>
</hibernate-mapping>

地址.HBM

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   namespace="Inventory.DomainObjects"
                   assembly="Inventory">
  <class name="Address" table="Inv_Supplier_Address" lazy="false">
    <id name="AddressID" column="AddressId" type="integer"/>

    <property name="Line1" column="Line1" type="string"/>
    <property name="Line2" column="Line2" type="string"/>
    <property name="Line3" column="Line3" type="string"/>

    <many-to-one name="SupplierID" column="SupplierId" not-null="true" class="Supplier" />
  </class>
</hibernate-mapping>

Answer 1

这看起来很可疑：

<many-to-one name="SupplierID" column="SupplierId" 
       not-null="true" class="Supplier" />

您能否尝试删除以上行以查看问题是否消失？

如果这样可以解决问题，您应该添加 many-to-one，如下所示：

namespace Inventory.DomainObjects
{
    [Serializable]
    public class Address 
    {
        public virtual int AddressID { get; set; }

        // CHANGED: reference supplier object instead of ID
        public virtual Supplier Supplier { get; set; } 

        public virtual string Line1 { get; set; }
        public virtual string Line2 { get; set; }
        public virtual string Line3 { get; set; }
    }
}

然后像这样更改您的 hbm 映射文件（以引用 Supplier 属性而不是 SupplierId

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   namespace="Inventory.DomainObjects"
                   assembly="Inventory">
  <class name="Address" table="Inv_Supplier_Address" lazy="false">
    <id name="AddressID" column="AddressId" type="integer"/>

    <property name="Line1" column="Line1" type="string"/>
    <property name="Line2" column="Line2" type="string"/>
    <property name="Line3" column="Line3" type="string"/>

    <many-to-one name="Supplier" column="SupplierId" 
             not-null="true" class="Supplier" />
  </class>
</hibernate-mapping>