为什么NHibernate说我的过滤器没有配置？

我试图在NHibernate中使用全局过滤器，据我所知，我正在做所有教程都做的事情，但我得到了一个例外

My.hbm.xml文件包含以下内容：

...
<class name="NHibernateSandbox.Foo, NHibernateSandbox" table="Foo">
    ...
    <property column="Content" type="String" name="Content" not-null="true" length="100" />
    <property column="Deleted" type="Boolean" name="Deleted" not-null="true" />
    <filter name="Foo_Nondeleted" condition="Deleted = false" />
</class>

如果我将log4net配置为详细，那么我会看到

INFO  NHibernate.Cfg.HbmBinder - Mapping class: NHibernateSandbox.Foo -> Foo
DEBUG NHibernate.Cfg.HbmBinder - Mapped property: Id -> RID, type: Int32
DEBUG NHibernate.Cfg.HbmBinder - Mapped property: Content -> Content, type: String
DEBUG NHibernate.Cfg.HbmBinder - Mapped property: Deleted -> Deleted, type: Boolean
DEBUG NHibernate.Cfg.HbmBinder - Applying filter [Foo_Nondeleted] as [Deleted = false]

---

在应用筛选器和正在配置并可用于会话的筛选器之间缺少什么步骤？

向类中添加筛选器是不够的：您还必须定义它。这归结为添加

<filter-def name="Foo_Nondeleted"></filter-def>

---

仅向类中添加筛选器是不够的：还必须定义它。这归结为添加

<filter-def name="Foo_Nondeleted"></filter-def>

<filter-def name="Foo_Nondeleted"></filter-def>

<filter name="Foo_Nondeleted" condition="Deleted = 0" />