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我们将 Castle Windsor 用于 WCF 服务（处理 JSON 请求/响应）。我们也在数据层中使用实体框架。

当我们使用PerWebRequestLifeStyle 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PerWcfOperationLifeStyle 时，它​​工作正常，但它从数据层返回相同的数据（在我的情况下，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）。下面是数据层中GET方法的实现：

以下方法给出了使用PerWebRequestLifeStyle 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PerWcfSessionLifeStyle 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)

以下是我们如何使用 Castle Windsor LifeStyle：

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

哪个是实现 Castle Windsor for WCF 相当于PerWebRequestLifeStyle 的最佳方式？请建议

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1 回答 1

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PerWcfOperation 生活方式正是您所发现的。对象在整个操作过程中都存在。这在工作单元情况下特别有价值，在这种情况下，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，然后在最终调用 DbContext 上的提交之前进行更多业务更改。

我假设您是 MyDbContainer 有一个您正在使用的私有 DbContext 实例，这就是您在整个调用过程中遇到共享 DbContext 的原因。

我可以看到两种方法来解决不需要的行为。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没有看到为什么你希望它持续一个 wcf 操作长度的任何理由。

另一种解决方案，通常我会采用的方法是让您的数据访问单例，并使用 IContextFactory（我自己的接口）注入它们，这将为该场合提供适当的生活方式上下文。

于 2013-10-26T00:49:54.393 回答