配置nhibernate时报 No persister for: NH.Model.Entities.Customer 异常

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="hibernate-configuration"
     type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" />
  </configSections>

  <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">

    <session-factory>
      <property name="proxyfactory.factory_class">NHibernate.ByteCode.LinFu.ProxyFactoryFactory, NHibernate.ByteCode.LinFu</property>
      <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
      <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
      <property name="dialect">NHibernate.Dialect.MsSql2000Dialect</property>
      <property name="show_sql">true</property>
      <property name="connection.connection_string">  Server=.;initial catalog=NH_DateBase; user=sa;password=sa;</property>
      <property name="adonet.batch_size">500</property>
      <property name="generate_statistics">true</property>
      <property name="use_outer_join">true</property>
      <property name="command_timeout">60</property>
      <mapping assembly="NH.Model"/><!--*****这个地方一定要加*****-->
    </session-factory>
  </hibernate-configuration>
</configuration>

若果采用App.config配置，则必须加<mapping assembly="NH.Model"/>来映射你的实体层。