Castle Windsor WCF集成中的perwebrequest等价物

Question

我们将Castle Windsor用于WCF服务(它处理JSON请求/响应)。另外，我们在数据层使用了实体框架。

当我们使用PerWebRequest LifeStyle时，它会抛出以下错误：

The server encountered an error processing the request. The exception message is 'HttpContext.Current is null. PerWebRequestLifestyle can only be used in ASP.Net'. See server logs for more details. The exception stack trace is:

at Castle.MicroKernel.Lifestyle.PerWebRequestLifestyleModule.GetScope() at Castle.MicroKernel.Lifestyle.WebRequestScopeAccessor.GetScope(CreationContext context) at Castle.MicroKernel.Lifestyle.ScopedLifestyleManager.GetScope(CreationContext context) at Castle.MicroKernel.Lifestyle.ScopedLifestyleManager.Resolve(CreationContext context, IReleasePolicy releasePolicy) at Castle.MicroKernel.Handlers.DefaultHandler.ResolveCore(CreationContext context, Boolean requiresDecommission, Boolean instanceRequired, Burden& burden) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context, Boolean instanceRequired) at Castle.MicroKernel.Handlers.AbstractHandler.Resolve(CreationContext context) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveFromKernelByType(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveFromKernel(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveCore(CreationContext context, ISubDependencyResolver contextHandlerResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.Resolve(CreationContext context, ISubDependencyResolver contextHandlerResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateConstructorArguments(ConstructorCandidate constructor, CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context, Burden burden) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.CreateInstance(CreationContext context, Boolean trackedExternally) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context, IReleasePolicy releasePolicy) at Castle.MicroKernel.Handlers.DefaultHandler.ResolveCore(CreationContext context, Boolean requiresDecommission, Boolean instanceRequired, Burden& burden) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context, Boolean instanceRequired) at Castle.MicroKernel.Handlers.AbstractHandler.Resolve(CreationContext context) at Castle.MicroKernel.DefaultKernel.ResolveComponent(IHandler handler, Type service, IDictionary additionalArguments, IReleasePolicy policy) at Castle.MicroKernel.DefaultKernel.Castle.MicroKernel.IKernelInternal.Resolve(String key, Type service, IDictionary arguments, IReleasePolicy policy) at Castle.MicroKernel.DefaultKernel.Resolve[T](String key, IDictionary arguments) at Castle.Facilities.WcfIntegration.WindsorInstanceProvider.GetInstance(InstanceContext instanceContext, Message message) at System.ServiceModel.Dispatcher.InstanceBehavior.GetInstance(InstanceContext instanceContext, Message request) at System.ServiceModel.InstanceContext.GetServiceInstance(Message message) at System.ServiceModel.Dispatcher.InstanceBehavior.EnsureServiceInstance(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

当我们使用PerWcfOperation LifeStyle时，它工作得很好，但它从数据层返回相同的数据(在我的例子中，它返回相同的UserStatus，除非我在数据层中的每个方法之前初始化_context )。下面是GET方法在数据层的实现：

下面的方法给出了使用PerWebRequest LifeStyle时web应用程序的预期结果。

public class UserDAL: IUserDAL
{
    #region Declaration
    private MyDBContainer _context;
    #endregion

    #region Constructor
    public UserDAL()
    {
        _context = new MyDBContainer();
    }
    #endregion

    #region Get User Status
    /// <summary>
    /// Get User Status
    /// </summary>
    /// <param name="user"></param>
    /// <returns></returns>
    public User GetUserStatus(User user)
    {
        st_User _dbUser = null;
        if (user != null && user.UserId > 0)
        {
            _dbUser = _context.st_User.Where(u => u.User_Id == user.UserId && !u.Is_Deleted).SingleOrDefault();
        }
        if (_dbUser != null && _dbUser.User_Id > 0)
        {
            user.LastLoginDate = _dbUser.Last_Login_Date;
            user.UserStatus = (UserStatus)Enum.Parse(typeof(UserStatus), _dbUser.User_Status, true);
        }

        return user;
    }
    #endregion
}

当我们使用PerWcfSession LifeStyle时，它会抛出以下错误：

The server encountered an error processing the request. The exception message is 'Could not obtain scope for component MyApp.DAL.UserDAL. This is most likely either a bug in custom IScopeAccessor or you're trying to access scoped component outside of the scope (like a per-web-request component outside of web request etc)'. See server logs for more details. The exception stack trace is:

at Castle.MicroKernel.Lifestyle.ScopedLifestyleManager.GetScope(CreationContext context) at Castle.MicroKernel.Lifestyle.ScopedLifestyleManager.Resolve(CreationContext context, IReleasePolicy releasePolicy) at Castle.MicroKernel.Handlers.DefaultHandler.ResolveCore(CreationContext context, Boolean requiresDecommission, Boolean instanceRequired, Burden& burden) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context, Boolean instanceRequired) at Castle.MicroKernel.Handlers.AbstractHandler.Resolve(CreationContext context) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveFromKernelByType(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveFromKernel(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveCore(CreationContext context, ISubDependencyResolver contextHandlerResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.Resolve(CreationContext context, ISubDependencyResolver contextHandlerResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateConstructorArguments(ConstructorCandidate constructor, CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context, Burden burden) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.CreateInstance(CreationContext context, Boolean trackedExternally) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context, IReleasePolicy releasePolicy) at Castle.MicroKernel.Handlers.DefaultHandler.ResolveCore(CreationContext context, Boolean requiresDecommission, Boolean instanceRequired, Burden& burden) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context, Boolean instanceRequired) at Castle.MicroKernel.Handlers.AbstractHandler.Resolve(CreationContext context) at Castle.MicroKernel.DefaultKernel.ResolveComponent(IHandler handler, Type service, IDictionary additionalArguments, IReleasePolicy policy) at Castle.MicroKernel.DefaultKernel.Castle.MicroKernel.IKernelInternal.Resolve(String key, Type service, IDictionary arguments, IReleasePolicy policy) at Castle.MicroKernel.DefaultKernel.Resolve[T](String key, IDictionary arguments) at Castle.Facilities.WcfIntegration.WindsorInstanceProvider.GetInstance(InstanceContext instanceContext, Message message) at System.ServiceModel.Dispatcher.InstanceBehavior.GetInstance(InstanceContext instanceContext, Message request) at System.ServiceModel.InstanceContext.GetServiceInstance(Message message) at System.ServiceModel.Dispatcher.InstanceBehavior.EnsureServiceInstance(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

下面是我们如何使用城堡温莎LifeStyle：

container.Register(Component.For<IUserDAL>().ImplementedBy<UserDAL>().LifeStyle.PerWcfSession());

哪种方式是最好的实现城堡Windsor为WCF的等价物的PerWebRequest LifeStyle？请给出建议

Answer 1

PerWcfOperation的生活方式正是你所发现的。对象在整个操作过程中都存在。在注入UserDAL的业务服务需要进行一些数据库更改，执行更多业务逻辑，然后进行更多业务更改，最后在DbContext上调用commit之前，它在工作单元情况下特别有价值。

我假设您的MyDbContainer有一个您正在使用的私有DbContext实例，这就是为什么您在整个调用过程中都会遇到共享的DbContext。

我可以看到两种方法来修复不想要的行为。首先，你可以让你的生活方式变得短暂，因为我在上面的代码中看不到任何理由，为什么你想要这样持续一个wcf操作长度。

另一种解决方案，也是我通常采用的方法，是让你的数据访问成为一个单例，并为它们注入一个IContextFactory (我自己的接口)，它将为特定场合提供一个适当的生活方式上下文。