NHibernate.MappingException：没有persister：XYZ

现在，在你说出来之前：我做了 Google，我的hbm.xml文件是嵌入式资源。

这是我打电话的代码：

ISession session = GetCurrentSession();
var returnObject =  session.Get<T>(Id);

这是我的类的映射文件：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="HQData.Objects.SubCategory, HQData" table="SubCategory" lazy="true">
    <id name="ID" column="ID" unsaved-value="0">
      <generator class="identity" />
    </id>

    <property name="Name" column="Name" />
    <property name="NumberOfBuckets" column="NumberOfBuckets"  />
    <property name="SearchCriteriaOne" column="SearchCriteriaOne" />

    <bag name="_Businesses" cascade="all">
      <key column="SubCategoryId"/>
      <one-to-many 
         class="HQData.Objects.Business, HQData"/>
    </bag>

    <bag name="_Buckets" cascade="all">
      <key column="SubCategoryId"/>
      <one-to-many
         class="HQData.Objects.Bucket, HQData"/>
    </bag>

  </class>
</hibernate-mapping>

有没有人跑过这个问题？

以下是完整的错误消息：

MappingException: No persister for:  HQData.Objects.SubCategory]NHibernate.Impl.SessionFactoryImpl.GetEntityPersister(String entityName, Boolean throwIfNotFound)
 in c:CSharpNH2.0.0nhibernatesrcNHibernateImplSessionFactoryImpl.cs:766 NHibernate.Impl.SessionFactoryImpl.GetEntityPersister(String entityName)
 in c:CSharpNH2.0.0nhibernatesrcNHibernateImplSessionFactoryImpl.cs:752 NHibernate.Event.Default.DefaultLoadEventListener.OnLoad(LoadEvent event, LoadType loadType)
 in c:CSharpNH2.0.0nhibernatesrcNHibernateEventDefaultDefaultLoadEventListener.cs:37 NHibernate.Impl.SessionImpl.FireLoad(LoadEvent event, LoadType loadType)
 in c:CSharpNH2.0.0nhibernatesrcNHibernateImplSessionImpl.cs:2054 NHibernate.Impl.SessionImpl.Get(String entityName, Object id)
 in c:CSharpNH2.0.0nhibernatesrcNHibernateImplSessionImpl.cs:1029 NHibernate.Impl.SessionImpl.Get(Type entityClass, Object id)
 in c:CSharpNH2.0.0nhibernatesrcNHibernateImplSessionImpl.cs:1020 NHibernate.Impl.SessionImpl.Get(Object id)
 in c:CSharpNH2.0.0nhibernatesrcNHibernateImplSessionImpl.cs:985 HQData.DataAccessUtils.NHibernateObjectHelper.LoadDataObject(Int32 Id)
 in C:DevelopmentHQChannelRepoHQ Channel ApplicationHQChannelHQDataDataAccessUtilsNHibernateObjectHelper.cs:42 HQWebsite.LocalSearch.get_subCategory()
 in C:DevelopmentHQChannelRepoHQ Channel ApplicationHQChannelHQWebsiteLocalSearch.aspx.cs:17 HQWebsite.LocalSearch.Page_Load(Object sender, EventArgs e)
 in C:DevelopmentHQChannelRepoHQ Channel ApplicationHQChannelHQWebsiteLocalSearch.aspx.cs:27 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +33 System.Web.UI.Control.OnLoad(EventArgs e) +99 System.Web.UI.Control.LoadRecursive() +47 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436

更新 ，这是我的方案的解决方案是什么：我已经改变了一些代码，我没有在运行时将配置文件添加到配置文件。

---

听起来像你忘了将映射程序集添加到会话工厂配置中。

如果你正在使用app.config ...

.
.
    <property name="show_sql">true</property>
    <property name="query.substitutions">true 1, false 0, yes 'Y', no 'N'</property>
    <mapping assembly="Project.DomainModel"/>  <!-- Here -->
</session-factory>
.
.

---

一些显而易见的东西，对于刚接触NHibernate的人来说非常有用。

应将所有XML映射文件视为嵌入式资源而不是默认内容。 该选项通过编辑文件属性中的Build Action属性进行设置。

然后将XML文件嵌入到程序集中，并在NHibernate配置阶段的项目启动时进行解析。

---

我的问题是我忘了将.hbm放在映射xml的名称中。 还要确保你使它成为一个嵌入式资源！

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