SignalR：解析 IMessageBus

Question

我正在使用 this 方式将依赖项注入我的 Hub 类:

public class StructureMapDependencyResolver : DefaultDependencyResolver
{
        private readonly IContainer _container;
        public StructureMapDependencyResolver(IContainer container)
        {
            if (container == null)
            {
                throw new ArgumentNullException("container");
            }
            _container = container;
        }
        public override object GetService(Type serviceType)
        {
            return !serviceType.IsAbstract && !serviceType.IsInterface && serviceType.IsClass
                               ? _container.GetInstance(serviceType)
                               : (_container.TryGetInstance(serviceType) ?? base.GetService(serviceType));
        }
        public override IEnumerable<object> GetServices(Type serviceType)
        {
            return _container.GetAllInstances(serviceType).Cast<object>().Concat(base.GetServices(serviceType));
        }
 }

为了使用它，我在 Global.asax 中有这些代码行：

SmObjectFactory.Container.Configure(x =>
            {
                x.For<IDependencyResolver>().Singleton().Add<StructureMapDependencyResolver>();
            });
            GlobalHost.DependencyResolver = SmObjectFactory.Container.GetInstance<IDependencyResolver>();

它在 SignalR 版本 2.1.2 中工作得很好，但是在升级到 SignalR 版本 2.2.0 之后我得到这个错误：

No default Instance is registered and cannot be automatically determined for type 'Microsoft.AspNet.SignalR.Messaging.IMessageBus'

There is no configuration specified for Microsoft.AspNet.SignalR.Messaging.IMessageBus

1.) new AckSubscriber(*Default of IMessageBus*, *Default of IAckHandler*)
2.) Microsoft.AspNet.SignalR.Infrastructure.AckSubscriber
3.) Instance of Microsoft.AspNet.SignalR.Infrastructure.AckSubscriber
4.) Container.GetInstance(Microsoft.AspNet.SignalR.Infrastructure.AckSubscriber)

说无法解析IMessageBus！我试过这个方案()，但是没有解决问题。
我应该为该依赖项提供一个实现吗？例如这样的事情：

x.For<IMessageBus>().Use<MessageBus>();

有什么想法吗？

Answer 1

谢谢@VahidN，其实我应该先从基础 class (+):

public override object GetService(Type serviceType) {
    if (serviceType == null) return null;

    var service = base.GetService(serviceType);
    if (service != null) return service;

    return (!serviceType.IsAbstract && !serviceType.IsInterface && serviceType.IsClass) ? _container.GetInstance(serviceType) : _container.TryGetInstance(serviceType);
}

SignalR：解析 IMessageBus

SignalR: resolving IMessageBus

asp.net

signalr

structuremap

signalr-hub