Question

我正在一个新项目中工作，并且我试图在asp.net mvc中使用ninject实现nhibernate。我有错误：

NHibernate.HibernateException：没有绑定到当前上下文的会话

以下是我使用的代码：

using FluentNHibernate.Automapping;
using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using FluentNHibernate.Conventions.Helpers;
using NHibernate;
using NHibernate.Context;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace TestNhibernateSessions
{
    public class SessionFactory : IHttpModule
    {
        private static readonly ISessionFactory _SessionFactory;
        static SessionFactory()
        {
            _SessionFactory = CreateSessionFactory();
        }
        public void Init(HttpApplication context)
        {
            context.BeginRequest += BeginRequest;
            context.EndRequest += EndRequest;
        }
        public void Dispose()
        {
        }
        public static ISession GetCurrentSession()
        {
            return _SessionFactory.GetCurrentSession();
        }

        private static void BeginRequest(object sender, EventArgs e)
        {
            ISession session = _SessionFactory.OpenSession();
            session.BeginTransaction();
            CurrentSessionContext.Bind(session);
        }

        private static void EndRequest(object sender, EventArgs e)
        {
            ISession session = CurrentSessionContext.Unbind(_SessionFactory);
            if (session == null) return;
            try
            {
                session.Transaction.Commit();
            }
            catch (Exception)
            {
                session.Transaction.Rollback();
            }
            finally
            {
                session.Close();
                session.Dispose();
            }
        }

        private static ISessionFactory CreateSessionFactory()
        {
            return Fluently.Configure()
                           .Database(MsSqlConfiguration.MsSql2008.ConnectionString(c => c.FromConnectionStringWithKey("DefaultConnection")))
                           .Mappings(m => m.AutoMappings.Add(CreateMappings()))
                           .CurrentSessionContext<WebSessionContext>()
                           .BuildSessionFactory();
        }

        private static AutoPersistenceModel CreateMappings()
        {
            return AutoMap
                .Assembly(System.Reflection.Assembly.GetCallingAssembly())
                .Where(t => t.Namespace != null && t.Namespace.EndsWith("Domain"))
                .Conventions.Setup(c => c.Add(DefaultCascade.SaveUpdate()));
        }
    }
}

[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(TestNhibernateSessions.App_Start.NinjectWebCommon), "Start")]
[assembly: WebActivatorEx.ApplicationShutdownMethodAttribute(typeof(TestNhibernateSessions.App_Start.NinjectWebCommon), "Stop")]

namespace TestNhibernateSessions.App_Start
{
    using System;
    using System.Web;

    using Microsoft.Web.Infrastructure.DynamicModuleHelper;

    using Ninject;
    using Ninject.Web.Common;
    using TestNhibernateSessions.Repository;
    using TestNhibernateSessions.Service;
    using NHibernate;


    public static class NinjectWebCommon
    {
        private static readonly Bootstrapper bootstrapper = new Bootstrapper();

        /// <summary>
        /// Starts the application
        /// </summary>
        public static void Start()
        {
            DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
            DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
            bootstrapper.Initialize(CreateKernel);
        }

        /// <summary>
        /// Stops the application.
        /// </summary>
        public static void Stop()
        {
            bootstrapper.ShutDown();
        }

        /// <summary>
        /// Creates the kernel that will manage your application.
        /// </summary>
        /// <returns>The created kernel.</returns>
        private static IKernel CreateKernel()
        {
            var kernel = new StandardKernel();
            try
            {
                kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
                kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();

                RegisterServices(kernel);
                return kernel;
            }
            catch
            {
                kernel.Dispose();
                throw;
            }
        }

        /// <summary>
        /// Load your modules or register your services here!
        /// </summary>
        /// <param name="kernel">The kernel.</param>
        private static void RegisterServices(IKernel kernel)
        {



            kernel.Bind<IProductRepository>().To<ProductRepository>();
            kernel.Bind<IProductService>().To<ProductService>();


        }
    }
}

Answer 1

由于您正在使用Ninject，我的建议是使用它来注入会话工厂而不是IHttpModule。为此，请创建Ninject Provider类，如下所示。请注意，这需要在代码中进行事务管理，我不喜欢在请求期间盲目地保持事务处理的想法。

public class SessionFactoryProvider : Provider<ISessionFactory>
{
    protected override ISessionFactory CreateInstance(IContext context)
    {
        return Fluently.Configure()
                       .Database(MsSqlConfiguration.MsSql2008.ConnectionString(c => c.FromConnectionStringWithKey("DefaultConnection")))
                       .Mappings(m => m.AutoMappings.Add(CreateMappings()))
                       .CurrentSessionContext<WebSessionContext>()
                       .BuildSessionFactory();
    }
}

public class SessionProvider : Provider<ISession>
{
    protected override ISession CreateInstance(IContext context)
    {
        var sessionFactory = context.Kernel.Get<ISessionFactory>();
        var session = sessionFactory.OpenSession();
        session.FlushMode = FlushMode.Commit;
        return session;
    }
}

然后在NinjectWebCommon中：

private static void RegisterServices(IKernel kernel)
{
    // session factory instances are singletons
    kernel.Bind<ISessionFactory>().ToProvider<SessionFactoryProvider>().InSingletonScope();
    // session-per-request
    kernel.Bind<ISession>().ToProvider<SessionProvider>().InRequestScope();
}

NHibernate.HibernateException：没有绑定到当前上下文的会话

1 个答案: