Question

我们正在开发基于

的Web应用程序

.NET 4.5.1
MVC 5.2.2
OWIN
WebApi 2.2
SignalR 2.2.0
Castle.Windsor 3.3.0
Wcf Integration Facility 3.3.0

为解析控制器，我们使用ControllerFactory类，如下页所述： http://docs.castleproject.org/Windsor.Windsor-tutorial-part-two-plugging-Windsor-in.ashx

为了解析依赖关系，我们使用WindsorDependencyResolver类：

public class WindsorDependencyResolver : IDependencyResolver
{
    public IWindsorContainer Container { get; private set; }

    public WindsorDependencyResolver(IWindsorContainer windsorContainer)
    {
        Container = windsorContainer;
    }

    public IDependencyScope BeginScope()
    {
        return new WindsorDependencyScope(this.Container);
    }

    public object GetService(Type serviceType)
    {
        return this.Container.Kernel.HasComponent(serviceType) ? this.Container.Resolve(serviceType) : null;
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return this.Container.ResolveAll(serviceType).Cast<object>().ToArray();
    }

    public void Dispose()
    {
    }
}

public class WindsorDependencyScope : IDependencyScope
{
    public IWindsorContainer Container { get; set; }
    public IDisposable Scope { get; set; }

    public WindsorDependencyScope(IWindsorContainer container)
    {
        this.Container = container;
        this.Scope = container.BeginScope();
    }

    public object GetService(Type serviceType)
    {
        return this.Container.Kernel.HasComponent(serviceType) ? this.Container.Resolve(serviceType) : null;
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return this.Container.ResolveAll(serviceType).Cast<object>().ToArray();
    }

    public void Dispose()
    {
        this.Scope.Dispose();
    }
}

请记住，我们不会使用Windsor容器解析SignalR的IHub类，它们由管道中的OWIN系统实例化。 Startup.cs代码如下所示：

public partial class Startup
{
    public void Configuration(IAppBuilder app)
    {
        ConfigureAuth(app);
        app.MapSignalR();
    }
}

所有控制器，wcf服务客户端和拦截器（不包括日志记录类）都在项目中的LifestylePerWebRequest中注册。但是，我们用于记录的类是单例。

下面的Web.config中有一个设置：

<system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
        ...
        <add name="PerRequestLifestyle" type="Castle.MicroKernel.Lifestyle.PerWebRequestLifestyleModule, Castle.Windsor" />
        ...
    </modules>
</system.webServer>

因此，当我们尝试解决一个wcf客户端 - 它具有每个Web请求生活方式 - 在SignalR中心时，我们得到以下例外：

System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'Scope cache was already disposed. This is most likely a bug in the calling code.'.
   at Castle.MicroKernel.Lifestyle.Scoped.ScopeCache.get_Item(Object id)
   at Castle.MicroKernel.Lifestyle.Scoped.DefaultLifetimeScope.GetCachedInstance(ComponentModel model, ScopedInstanceActivationCallback createInstance)
   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.DefaultKernel.ResolveComponent(IHandler handler, Type service, IDictionary additionalArguments, IReleasePolicy policy)
   at Castle.MicroKernel.DefaultKernel.Castle.MicroKernel.IKernelInternal.Resolve(Type service, IDictionary arguments, IReleasePolicy policy)
   at Castle.MicroKernel.DefaultKernel.Resolve(Type service, IDictionary arguments)
   at Castle.Windsor.WindsorContainer.Resolve[T]()
   at UIServer.WebUI.Hubs.MailThreadHub.Broadcast(MailMessageListDto mailMessage) in c:\Development\DDD\UIServer.WebUI\Hubs\MailThreadHub.cs:line 92

在调用Container.Resolve（）方法之前，我可以在调试器窗口中看到HttpContext。顺便说一下，我可以解决单例记录类。

有趣的是，我的队友没有任何例外。主要区别在于我们的OS版本。我在Windows 8.1中运行代码，我的队友在Windows 7中运行它。

我们仅针对信号器集线器获得此例外。我们在其他任何地方都没有例外。我们怎样才能解决这个问题？

Answer 1

我在Startup类中使用ServiceLocator来解析IDependencyResolver。看起来像是：

internal class Startup
{
    public void Configuration(IAppBuilder appBuilder)
    {
        var config = new HttpConfiguration();
        config.Routes.MapHttpRoute("ActionApi", "{controller}/{action}/{id}", new {id = RouteParameter.Optional});

        config.DependencyResolver = ServiceLocator.Instance.Resolve<IDependencyResolver>();

        appBuilder.UseWebApi(config);
    }
}

也许这是有帮助的。

温莎城堡抛出'范围缓存已被处置。'在SignalR Hubs

1 个答案: