NHibernate当前会话上下文错误“对象引用未设置为对象实例”

Question

我想使用NHibernate会话上下文。

我的hibernate.cfg.xml中包含的内容：

<property name="current_session_context_class">web</property>

但是现在当我尝试检查会话是否绑定时：

if (CurrentSessionContext.HasBind(mySessionFactory))

我得到了错误：

System.NullReferenceException: Object reference not set to an instance of an 
object.
   at lambda_method(Closure , Object )
   at NHibernate.Context.WebSessionContext.GetMap()
   at NHibernate.Context.MapBasedSessionContext.get_Session()
   at NHibernate.Context.CurrentSessionContext.HasBind(ISessionFactory factory)

当我检查sessionFactory时，我发现CurrentSessionContext抛出错误：

我以前从未使用过CurrentSessionContext。因此，我很高兴获得帮助。谢谢！

==编辑==

这是我创建会话工厂所必须的：

public Configuration GetConfiguration()
{
    configuration = new Configuration();

    // Configure NHibernate with the hibernate.cfg.xml file 
    configuration.Configure(Path.Combine(System.Environment.CurrentDirectory, "hibernate.cfg.xml"));

    // Create new model mapper
    var mapper = new ModelMapper();

    // Get all types of the assembly and add them to the mapper
    mapper.AddMappings(assembly.GetExportedTypes());

    // Compile the mappings
    var mapping = mapper.CompileMappingForAllExplicitlyAddedEntities();

    // Add the mappings (using executing assembly)
    configuration.AddMapping(mapping);

    return configuration;
}

我叫：

private readonly Dictionary<string, ISessionFactory> sessionFactories = new Dictionary<string, ISessionFactory>();

sessionFactories.Add("hibernate.cfg.xml", GetConfiguration(assembly).BuildSessionFactory());

还有我的OpenSession()

public void OpenSession(string configFile)
{
     if (CurrentSessionContext.HasBind(SessionFactoryHelper.Instance.GetSessionFactoryByConfigFile(configFile)))
            throw new Exception("There is already a session bind to current context");

    // Get new session from the session factory
    var session = SessionFactoryHelper.Instance.GetSessionFactoryByConfigFile(configFile).OpenSession();

    // Start the transaction
    session.BeginTransaction();

    // Bind the session to the currentsession context
    CurrentSessionContext.Bind(session);
}

==编辑2 ==

正如我刚刚发现的那样，当我尝试将会话绑定到它时，似乎CurrentSessionContext抛出了NullReferenceExeption。

CurrentSessionContext.Bind(session);

Answer 1

请参阅documentation。 NHibernate.Context.WebSessionContext可能是您要寻找的人。