Nhibernate无法在生产环境中工作

Question

我正在将C＃.NET 3.5 Web App与NHibernate一起使用。 在开发环境中一切正常，但是当我在IIS中部署应用程序时，出现以下异常：

 Object reference not set to an instance of an object. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 

An unhandled exception was generated during the execution of the current web request.     Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]
SVC_Cadu_Dal.Helper.NHibernateHelper.get_SessionFactory() in C:\workspace\SVC_Applications\cadu\SVC_Cadu\SVC_Cadu_Dal\Helper\NHibernateHelper.cs:73
SVC_Cadu_Dal.Helper.NHibernateHelper.OpenSession() in C:\workspace\SVC_Applications\cadu\SVC_Cadu\SVC_Cadu_Dal\Helper\NHibernateHelper.cs:82
SVC_Cadu.PessoaPage.initDropDownList(DropDownList ddl, Type type) in C:\workspace\SVC_Applications\cadu\SVC_Cadu\SVC_Cadu\PessoaPage.aspx.cs:84
SVC_Cadu.PessoaPage.initComponents() in C:\workspace\SVC_Applications\cadu\SVC_Cadu\SVC_Cadu\PessoaPage.aspx.cs:66
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +137
System.Web.UI.Control.LoadRecursive() +98
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2524

这是我的NHibernateHelper类：

public class NHibernateHelper {
    private static ISessionFactory sessionFactory;
    private static ISession session;

    private static ISessionFactory SessionFactory {
        get {
            if(sessionFactory == null) {
                try {
                    var config = new Configuration();
                    // ----------------------------------------------------
                    // Configuration for DEVELOPMENT and PRODUCTION envs.
                    config.Configure(Path.Combine(
                            AppDomain.CurrentDomain.BaseDirectory,
                            "bin\\hibernate.cfg.xml"));
                    // ----------------------------------------------------
                    HbmSerializer.Default.Validate = true;
                    //log4net.Config.XmlConfigurator.Configure();
                    sessionFactory = config.BuildSessionFactory();
                } catch(Exception e) {
                    throw(e.InnerException);
                }
            }
            return sessionFactory;
        }
    }

    public static ISession OpenSession() {
        return session != null && session.IsOpen ? session
                : session = SessionFactory.OpenSession();
    }
}

我的解决方案如下所示：

- Solution
    - WebApp <project>
    - Dal <project>
        - "Mappings" <folder>
        - hibernate.cfg.xml (Embedded Resource, Copy Always) <file>
        - Helpers <folder>
            - NHibernateHelper.cs
    - Model <project>
        - "Models" <classes>
    - (...)

其他重要信息是，我正在使用XML映射（不是流利的或类的映射）。 我已经尝试过：

• 将“ hibernate.cfg.xml”内容放入“ Web.config”文件中（当然，还要在“ config.Configure（）”方法中更改参数；
• 不将任何值传递给“ config.Configure（）”方法；
• 将一个硬编码的字符串放入“ config.Configure（）”，例如“ config.Configure（“ bin \\ hibernate.cfg.xml”）;
• 哭

我不明白为什么我的NHibernate配置可以在开发中工作而不能在生产中工作。 我究竟做错了什么？

Answer 1

为什么不使用HttpContext.Current.Server.MapPath来获取服务器中的文件路径。

还要检查文件夹权限以执行和读取，也许在应用程序池中配置的用户无权读取bin文件夹。 您是否已经尝试将nhibernate.cfg.xml放在其他文件夹中，也许放在App_data等其他文件夹中？