Question

在我的代码中，当会话打开并连接时，在调用List（）方法之后：

        using (ISession NSession = SessionProvider.GetSession())
        {
            ICriteria CriteriaQuery =
                NSession.CreateCriteria(typeof(Application));
             return (List<Application>) CriteriaQuery.List<Application>();
        }

它不检索任何数据而只是“{}”，这是Application Class及其映射XML代码：

public class Application
{
     private string _name;
     private Developer _developer;
     private int _id;
     private List<Bug> _bugs;

    public Application()
    {
        _bugs = new List<Bug>();
    }

    public virtual int ApplicationId
    {
        get { return _id; }
        set { _id = value; }
    }

    public virtual Developer Developer
    {
        get { return _developer; }
        set { _developer = value; }
    }

    public virtual string Name
    {
        get { return _name; }
        set { _name = value; }
    }

    public virtual List<Bug> Bugs
    {
        get { return _bugs; }
        set { _bugs = value; }
    }
}

和

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="BugTracker.Model"
                   assembly="BugTracker">
  <class name="Application" table="Applications" lazy="false">
    <id name="ApplicationId" column ="ApplicationId" type="int" unsaved-value ="0">
      <generator class ="native"></generator>
    </id>

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

    <component access ="field.camelcase-underscore" name ="Developer"
               class="Developer">
      <property access ="field.camelcase-underscore" 
                column ="DeveloperFirstName" name="FirstName"/>
      <property access ="field.camelcase-underscore" 
                column="DeveloperLastName" name="LastName"/>
    </component>

    <bag cascade="all-delete-orphan"
          inverse ="true"
          name ="Bugs"
          lazy="false"
          access ="field.camelcase-underscore">
      <key column ="ApplicationId"/>
      <one-to-many class ="Bug"/>
    </bag>

  </class>
</hibernate-mapping>

Answer 1

你确定return (List<Application>) CriteriaQuery.List<Application>();上没有异常？

据我所知，nhibernate需要集合接口，所以它可以插入自己的转换。您可以尝试将List<Bug>更改为IList<Bug>

NHibernate.ISession.CreateCriteria（typeof（BusinessObject））是{}

1 个答案: