asp.net-mvc - SignalR Hub ResolutionFailedException 与 Unity

Question

当我尝试在 MVC Web 应用程序中使用 Unity 解析 SignalR 集线器时，遇到了一个非常烦人的 ResolutionFailedException 错误。我的代码如下所示。

我的 Bootstrap 类

public static class Bootstrapper
{
    public static IUnityContainer Initialise()
    {
        var container = BuildUnityContainer();
        var unityDependencyResolver = new UnityDependencyResolver(container);

        //Used for MVC
        DependencyResolver.SetResolver(unityDependencyResolver);

        //Used for SignalR
        GlobalHost.DependencyResolver = new SignalRUnityDependencyResolver(container);

        return container;
    }

    private static IUnityContainer BuildUnityContainer()
    {
        var container = new UnityContainer();

        // register all your components with the container here
        // it is NOT necessary to register your controllers

        // e.g. container.RegisterType<ITestService, TestService>(); 

        RegisterTypes(container);

        return container;
    }

    public static void RegisterTypes(IUnityContainer container)
    {

        //Repositories
        
        container.RegisterType<ChatMessageRepository>();
        

        //Services 
        container.RegisterType<CapturePoolService>();
        container.RegisterType<HistoricalDataService>();

        //Context
        container.RegisterType<ICustomPrincipal, CustomPrincipal>(new PerRequestLifetimeManager());
        container.RegisterType<IDatabaseFactory, DatabaseFactory>(new PerRequestLifetimeManager());
        container.RegisterType<UnitOfWork>(new PerRequestLifetimeManager());

        //Hubs
        container.RegisterType<ChatHub>(new InjectionFactory(CreateChatHub));

    }

    private static object CreateChatHub(IUnityContainer container)
    {
        return new ChatHub(container.Resolve<ChatMessageRepository>(), container.Resolve<UnitOfWork>());
    }

}

我的聊天中心

public class ChatHub : Hub
{
    private readonly ChatMessageRepository _chatMessageRepository;
    private readonly UnitOfWork _unitOfWork;

    public ChatHub(
        ChatMessageRepository chatMessageRepository,
        UnitOfWork unitOfWork)
    {
        _chatMessageRepository = chatMessageRepository;
        _unitOfWork = unitOfWork;
    }

}

现在，我有几个不同的 View ，每个 View 都使用聊天中心的一个实例(例如，将其视为单独的聊天室，它们都使用我的中心中编写的相同逻辑)。当我进入这些“房间”之一时，我的逻辑按预期工作。但是，当我离开该页面并转到应用程序中的任何其他页面时，就会出现问题。错误如下:

Resolution of the dependency failed, type = "Core.Repositories.ChatMessageRepository", name = "(none)".

Exception occurred while: while resolving.

Exception is: InvalidOperationException - Operation is not valid due to the current state of the object.

---

At the time of the exception, the container was:

Resolving Repositories.ChatMessageRepository,(none)

Resolving parameter "dbFactory" of constructor Repositories.ChatMessageRepository(Library.IDatabaseFactory dbFactory)

Resolving Context.DatabaseFactory,(none) (mapped from Library.IDatabaseFactory, (none))

它由我的 SignalRUnityDependencyResolver 触发

public override Object GetService(Type serviceType)
    {
        return _container.IsRegistered(serviceType) ? _container.Resolve(serviceType): base.GetService(serviceType);
    }

特别是“_container.Resolve(serviceType)”调用。

有人可以帮忙吗？

谢谢。

Answer 1

我通过向 HierarchicalLifetimeManager 注册我的集线器解决了这个问题。