NHibernate Custom Collections hack 在事务外部工作，但在事务内部不起作用

发布于 2024-09-18 02:05:40 字数 1313 浏览 1 评论 0原文

按照此处描述的技术，我能够填充为其子级使用自定义集合的域对象。相关的属性映射如下所示：

    <component name="Contacts" class="My.CustomList`1[[Domain.Object, DomainAssembly]], MyAssembly">
        <set name="InnerList">
            <key column="PARENT_ID" />
            <one-to-many class="Contact" />
        </set>
    </component>

我的自定义集合类将 InnerList 属性公开为 ICollection ，如下所示：

    protected System.Collections.ICollection InnerList
    {
        get
        {
            return this;
        }
        set
        {
            Clear();
            foreach (DomainObject o in value)
            {
                Add(o);
            }
        }
    }

这就像从数据库加载数据的魅力，而不必放弃我相当有用的自定义集合班级。

然后我继续尝试实现保存，并遵循建议

现在，当我在加载后提交时，NHibernate 会抛出 InvalidCastException：“无法将类型为 'My.CustomList`1[Domain.Object, DomainAssembly]' 的对象转换为类型为 'Iesi.Collections.ISet' ”。

有没有办法让这项工作按照我期望的方式进行？

编辑：

按照Raphael提供的指导，我尝试切换到ICollection，当我提交事务时，它给了我一个不同的InvalidCastException：无法转换类型为'的对象My.CustomList`1[Domain.Object]' 以键入“NHibernate.Collection.IPercientCollection”。

原文

Following the technique described here, I was able to populate a domain object that uses custom collections for its children. The relevant property mapping looks like this:

    <component name="Contacts" class="My.CustomList`1[[Domain.Object, DomainAssembly]], MyAssembly">
        <set name="InnerList">
            <key column="PARENT_ID" />
            <one-to-many class="Contact" />
        </set>
    </component>

My custom collection class exposes the InnerList property as an ICollection like so:

    protected System.Collections.ICollection InnerList
    {
        get
        {
            return this;
        }
        set
        {
            Clear();
            foreach (DomainObject o in value)
            {
                Add(o);
            }
        }
    }

This worked like a charm to load data from the database and not have to abandon my rather useful custom collection class.

Then I moved on to try implement saving, and following the advice given in this thread, decided to wrap every call to NHibernate in a transaction.

Now when I commit following my load, NHibernate throws an InvalidCastException: "Unable to cast object of type 'My.CustomList`1[Domain.Object, DomainAssembly]' to type 'Iesi.Collections.ISet'."

Is there a way to make this work the way I expect it to?

EDIT:

Following the lead provided by Raphael, I tried switching to ICollection<T> which gives me a different InvalidCastException when I commit the transaction: Unable to cast object of type 'My.CustomList`1[Domain.Object]' to type 'NHibernate.Collection.IPersistentCollection'.

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