SignalR - 結構構造函數依賴注入：signalr結構圖解析器

我在MVC4中使用結構圖構造函數依賴解析器。應用程序成功運行，但在signalR JavaScript客戶端沒有連接到我的集線器（未將對象引用設置到對象的實例。）SignalR - 結構構造函數依賴注入：signalr結構圖解析器

請告訴我什麼地方錯了我下面的代碼：

SignalRStructureMapResolver.cs

public class SignalRStructureMapResolver : DefaultDependencyResolver 
{ 
    private readonly IContainer _container; 

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

    public override object GetService(Type serviceType) 
    { 
     object service; 
     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)); 
    } 
}

UiRegistry.cs

public class UiRegistry : Registry 
{ 
    public UiRegistry() 
    { 
     Scan(x => 
      { 
       x.TheCallingAssembly(); 
       x.WithDefaultConventions(); 
       x.AssemblyContainingType<IMappingEngine>(); 
      }); 

     KeepAlive.Start(); 

     For<IUnitOfWork>() 
      .Singleton() 
      .HybridHttpOrThreadLocalScoped() 
      .Use<UnitOfWork>(); 

     For<IMappingEngine>().Use(ctx => Mapper.Engine); 

     For<IDependencyResolver>().Add<SignalRStructureMapResolver>(); 
    } 
}

個

AppStartUpModule.cs

public class AppStartUpModule : IHttpModule 
{ 
    public static void BootStrapper() 
    { 
     ConfigureSignalR();    
    } 


    private static void ConfigureSignalR() 
    { 
     GlobalHost.DependencyResolver = ObjectFactory.GetInstance<IDependencyResolver>();   
    }  
}

ChatHub.cs

public class ChatHub : Hub 
{ 
    private readonly IViewRepository<MemberView> _memberRepository; 
    public ChatHub(IViewRepository<MemberView> memberRepository) 
    { 
     _memberRepository = memberRepository; 
    } 

    public void Send(string message) 
    { 
     var name = HttpContext.Current.User.Identity.Name; 

     var mem = _memberRepository.GetByKey(Property.Of<MemberView>(x => x.Code), name); 

     var currentDateTime = SystemTime.Now(); 
     Clients.All.sendMessage(name, message, currentDateTime); 
    } 
}

但運行應用程序時的錯誤有：

在控制檯中鉻的

GET http://localhost:9095/signalr/negotiate?connectionData=%5B%7B%22name%22%3A%22chathub%22%7D%5D&clientProtocol=1.3&_=1392969587574 500 (Internal Server Error)

在網絡上獲取請求錯誤

<!DOCTYPE html> 
<html> 
<head> 
    <title>Object reference not set to an instance of an object.</title> 
    <meta name="viewport" content="width=device-width" /> 
    <style> 
    body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;} 
    p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px} 
    b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px} 
    H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red } 
    H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon } 
    pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt} 
    .marker {font-weight: bold; color: black;text-decoration: none;} 
    .version {color: gray;} 
    .error {margin-bottom: 10px;} 
    .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; } 
    @media screen and (max-width: 639px) { 
     pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; } 
    } 
    @media screen and (max-width: 479px) { 
     pre { width: 280px; } 
    } 
    </style> 
</head> 

<body bgcolor="white"> 

     <span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1> 

     <h2> <i>Object reference not set to an instance of an object.</i> </h2></span> 

     <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif "> 

     <b> Description: </b>An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

     <br><br> 

     <b> Exception Details: </b>System.NullReferenceException: Object reference not set to an instance of an object.<br><br> 

     <b>Source Error:</b> <br><br> 

     <table width=100% bgcolor="#ffffcc"> 
      <tr> 
       <td> 
        <code> 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.</code> 

       </td> 
      </tr> 
     </table> 

     <br> 

     <b>Stack Trace:</b> <br><br> 

     <table width=100% bgcolor="#ffffcc"> 
      <tr> 
       <td> 
        <code><pre> 

[NullReferenceException: Object reference not set to an instance of an object.] 
Microsoft.AspNet.SignalR.PersistentConnection.ProcessNegotiationRequest(HostContext context) +400 
Microsoft.AspNet.SignalR.PersistentConnection.ProcessRequest(HostContext context) +318 
Microsoft.AspNet.SignalR.Hubs.HubDispatcher.ProcessRequest(HostContext context) +526 
Microsoft.AspNet.SignalR.PersistentConnection.ProcessRequest(IDictionary`2 environment) +222 
Microsoft.AspNet.SignalR.Owin.Middleware.HubDispatcherMiddleware.Invoke(IOwinContext context) +249 
Microsoft.Owin.Mapping.&lt;Invoke&gt;d__0.MoveNext() +523 
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +22 
Microsoft.Owin.Host.SystemWeb.Infrastructure.ErrorState.Rethrow() +33 
Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult.End(IAsyncResult ar) +150 

Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.EndFinalWork(IAsyncResult ar) +42 
System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +415 
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +155 
</pre></code> 

       </td> 
      </tr> 
     </table> 

     <br> 

     <hr width=100% size=1 color=silver> 

     <b>Version Information:</b>&nbsp;Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34009 

     </font> 

</body> 
</html> 
<!-- 
[NullReferenceException]: Object reference not set to an instance of an object. 
at Microsoft.AspNet.SignalR.PersistentConnection.ProcessNegotiationRequest(HostContext context) 
at Microsoft.AspNet.SignalR.PersistentConnection.ProcessRequest(HostContext context) 
at Microsoft.AspNet.SignalR.Hubs.HubDispatcher.ProcessRequest(HostContext context) 
at Microsoft.AspNet.SignalR.PersistentConnection.ProcessRequest(IDictionary`2 environment) 
at Microsoft.AspNet.SignalR.Owin.Middleware.HubDispatcherMiddleware.Invoke(IOwinContext context) 
at Microsoft.Owin.Mapping.MapMiddleware.<Invoke>d__0.MoveNext() 
--- End of stack trace from previous location where exception was thrown --- 
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() 
at Microsoft.Owin.Host.SystemWeb.Infrastructure.ErrorState.Rethrow() 
at Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult.End(IAsyncResult ar) 
at  Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.EndFinalWork(IAsyncResult ar) 
at System.Web.HttpApplication.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) 
-->

來源

2014-02-21 Nikunj B. Balar

試試這個代碼，如果需要進行更改，按您的需要：

[assembly: OwinStartup(typeof(WebApp.Initialization.OwinStartup))] 
namespace WebApp.Initialization 
{ 
    public class OwinStartup 
    { 
     public static IBus Bus { get; private set; } 

     public void Configuration(IAppBuilder app) 
     { 
      BootStrapper(); 

      var resolver = ObjectFactory.GetInstance<IDependencyResolver>(); 

      var config = new HubConfiguration 
      { 
       Resolver = resolver 
      }; 

      app.MapSignalR(config); 
     }   

     public static void ConfigureNServiceBus() 
     { 
      Bus = Configure.With() 
       .StructureMapBuilder(ObjectFactory.Container) 
       .MsmqSubscriptionStorage() 
       .PurgeOnStartup(false) 
       .UnicastBus() 
       .ImpersonateSender(false) 
       .CreateBus() 
       .Start(() => Configure.Instance.ForInstallationOn<NServiceBus.Installation.Environments.Windows>().Install()); 
     } 
    } 
}

如果有任何疑問，張貼了我。 :)

來源

2014-03-28 03:38:11

謝謝，拯救我的生命 –

SignalR - 結構構造函數依賴注入：signalr結構圖解析器

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