asp.net-mvc-3 – SignalR依赖注入问题

发布时间：2020-12-15 18:39:50 所属栏目：asp.Net 来源：网络整理

导读：我在我的MVC3应用程序中使用SignalR，并且由于我已经在我的控制器上实现了StructureMap依赖注入，所以我想在我的中心做同样的事情，但是我似乎无法使其工作。请告诉我我的代码如下： SignalRSmDependencyResolver.cs public class SignalRSmDependencyResol

我在我的MVC3应用程序中使用SignalR，并且由于我已经在我的控制器上实现了StructureMap依赖注入，所以我想在我的中心做同样的事情，但是我似乎无法使其工作。

请告诉我我的代码如下：

SignalRSmDependencyResolver.cs

public class SignalRSmDependencyResolver : DefaultDependencyResolver
{
    private IContainer _container;

    public SignalRSmDependencyResolver(IContainer container)
    {
        _container = container;
    }

    public override object GetService(Type serviceType)
    {
        object service = null;
        if (!serviceType.IsAbstract && !serviceType.IsInterface && serviceType.IsClass)
        {
            // Concrete type resolution
            service = _container.GetInstance(serviceType);
        }
        else
        {
            // Other type resolution with base fallback
            service = _container.TryGetInstance(serviceType) ?? base.GetService(serviceType);
        }
        return service;
    }

    public override IEnumerable<object> GetServices(Type serviceType)
    {
        var objects = _container.GetAllInstances(serviceType).Cast<object>();
        objects.Concat(base.GetServices(serviceType));
        return objects;
    }
}

SignalRExtensionsRegistry.cs

public class SignalRExtensionsRegistry : Registry
{
    public SignalRExtensionsRegistry()
    {
        For<IDependencyResolver>().Add<SignalRSmDependencyResolver>();
    }
}

IoC.cs

public static class IoC {
    public static IContainer Initialize() {

        var container = BootStrapper.Initialize();

        container.Configure(x =>
        {
            x.For<IControllerActivator>().Singleton().Use<StructureMapControllerActivator>();
        });

        return container;
    }
}

public class StructureMapControllerActivator : IControllerActivator {
    public StructureMapControllerActivator(IContainer container) {
        _container = container;
    }

    private IContainer _container;

    public IController Create(RequestContext requestContext,Type controllerType) {
        IController controller = DependencyResolver.Current.GetService(controllerType) as IController;
        return controller;
    }
}

AppStart_Structuremap.cs

[assembly: WebActivator.PreApplicationStartMethod(typeof(StoreUI.AppStart_Structuremap),"Start")]

namespace MyNameSpace {
public static class AppStart_Structuremap {
    public static void Start() {
        var container = (IContainer) IoC.Initialize();
        DependencyResolver.SetResolver(new StructureMapDependenceyResolver(container));
        AspNetHost.SetResolver(new StructureMapDependencyResolver(container));            
    }
}
}

通知书

[HubName("notificationsHub")]
public class NotificationsHub : Hub
{    
    #region Declarations
    private readonly IUserService userService;
    #endregion

    #region Constructor

    public NotificationsHub(IUserService userService)
    {
        this.userService = userService;
    }

    #endregion

    public void updateServer(string message)
    {
        Clients.updateClient(message);
    }
}

谢谢

解决方法

将Structuremap转换成SignalR其实很简单。首先要创建自己的解析器：

StructureMap Resolver

用途：

using SignalR.Infrastructure;
using StructureMap;

类：

public class StructureMapResolver : DefaultDependencyResolver
{
    private IContainer _container;

    public StructureMapResolver(IContainer container)
    {
        _container = container;
    }

    public override object GetService(Type serviceType)
    {
        object service = null;
        if (!serviceType.IsAbstract && !serviceType.IsInterface && serviceType.IsClass)
        {
            // Concrete type resolution
            service = _container.GetInstance(serviceType);
        }
        else
        {
            // Other type resolution with base fallback
            service = _container.TryGetInstance(serviceType) ?? base.GetService(serviceType);
        }
        return service;
    }

    public override IEnumerable<object> GetServices(Type serviceType)
    {
        var objects = _container.GetAllInstances(serviceType).Cast<object>();
        return objects.Concat(base.GetServices(serviceType));
    }
}

这里的想法是尝试使用容器来解决依赖关系，如果没有依赖关系，将其传递给默认解析器。这样，您就不用担心SignalR中的所有其他依赖项，只能将注意力集中到(Hubs，ConnectionIdFactory，MessageBus等)上。

解决方案和集线器的绑定

接下来，您将要在容器中注册(我喜欢使用注册表)：

用途：

using SignalR.Infrastructure;
using StructureMap.Configuration.DSL;

类：

public class ExtensionsRegistry : Registry
{
    public ExtensionsRegistry()
    {
        For<IDependencyResolver>().Add<StructureMapResolver>();
    }
}

拆卸变更

最后，您将要告诉SignalR使用您的解析器而不是默认值：

Global :: Application_Start或WebActivator :: Pre_Start

用途：

using SignalR.Hosting.AspNet;
using SignalR.Infrastructure;

Application_Start：

// Make sure you build up the container first
AspNetHost.SetResolver(StructureMap.ObjectFactory.GetInstance<IDependencyResolver>());

Silly Hub与注入的依赖关系

现在，您可以将容器知道的任何依赖项注入到集线器本身中：

[HubName("defaultHub")]
public class DefaultHub : Hub,IDisconnect
{
    private readonly IRepository _repo;
    public DefaultHub(IRepository repo)
    {
        _repo = repo;
    }

    public void Connect()
    {
        Caller.setUser(Context.ConnectionId);
        Clients.addMessage(string.Format("{0} has connected",Context.ConnectionId));
    }

    public void MessageSender(string message)
    {
        Caller.addMessage(_repo.RepositoryMessage());
        Clients.addMessage(message);
    }

    public Task Disconnect()
    {
        var clientId = this.Context.ConnectionId;
        return Task.Factory.StartNew(() => { Clients.addMessage(string.Format("{0} has disconnected",clientId)); });
    }
}

（编辑：李大同）

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