使用UnityContainer作爲SignalR依賴關係解析器

Question

我使用Unity作爲我的DI容器，在解析SignalR集線器時我無法使其工作。有沒有人有過這個成功？我已經試過如下：

public class UnityDependencyResolver : DefaultDependencyResolver 
    { 
     private readonly IUnityContainer _Container; 



    public UnityDependencyResolver (IUnityContainer container) 
      { 
       _Container = container; 
       //edit to add 
       container.RegisterInstance<IJavaScriptMinifier>(NullJavaScriptMinifier.Instance); 

      } 

     public override object GetService(Type serviceType) 
     { 
      return base.GetService(serviceType) ?? _Container.Resolve(serviceType); 
     } 

     public override IEnumerable<object> GetServices(Type serviceType) 
     { 
      return base.GetServices(serviceType) ?? _Container.ResolveAll(serviceType); 
     } 

    } 

，但我發現指示錯誤無法解析SignalR.Infrastructure.IJavaScriptMinifier

Answer 1

我作爲一個有點困惑，爲什麼你試着先做好基本分辨率統一解析器第二。通常，如果您要用自己的實現來替換基本實現，兩者都將解決，但您的應該是第一個，以便返回您的重寫類的實例。例如，假設你想覆蓋SignalR中的IConnectionIdFactory。您可以創建自己的類，該類繼承自給定的接口，然後使用Unity註冊它。那麼你的依賴解析器應該能夠解析給定的依賴關係並返回，而不會觸及SignalR解析器。我把一個小的測試應用程序，我的依賴解析器是這樣的：

扶養解析器：

public class UnityResolver : DefaultDependencyResolver 
{ 
    private readonly IUnityContainer _container; 
    public UnityResolver(IUnityContainer container) 
    { 
     _container = container; 
    } 

    public override object GetService(Type serviceType) 
    { 
     if (_container.IsRegistered(serviceType)) 
     { 
      return _container.Resolve(serviceType); 
     } 
     return base.GetService(serviceType); 
    } 

    public override IEnumerable<object> GetServices(Type serviceType) 
    { 
     if (_container.IsRegistered(serviceType)) 
     { 
      return _container.ResolveAll(serviceType); 
     } 
     return base.GetServices(serviceType); 
    } 
} 

它來測試我們是否擁有一個分辨率路徑Resolve將引發與團結的重要如果不存在，則爲例外。

爲了完整起見，這裏是實現：

ConnectionIDFactory：

public class ConnectionIdFactory : IConnectionIdFactory 
{     
    public string CreateConnectionId(IRequest request) 
    {    
     return Guid.NewGuid().ToString(); 
    } 
} 

報名：

public class Bootstrapper 
{ 
    public static void Pre_Start() 
    { 
     Container.DefaultContainer.Instance.RegisterType(
      typeof(IConnectionIdFactory), 
      typeof(Repositories.ConnectionIdFactory), 
      null, 
      new Microsoft.Practices.Unity.ContainerControlledLifetimeManager()); 

     AspNetHost.SetResolver(new Resolvers.UnityResolver(Container.DefaultContainer.Instance)); 
    } 
} 

Answer 2

昨天我通過以下方式解決了這個問題：

註冊容器：

AspNetHost.SetResolver(dependencyResolver); 
    DependencyResolver.SetResolver(dependencyResolver); 

解析器：

public class UnityDependencyResolver : DefaultDependencyResolver, IDependencyResolver 
    { 
     private readonly IUnityContainer _container; 

     public UnityDependencyResolver(IUnityContainer container) 
     { 
      _container = container; 
     } 

     #region IDependencyResolver Members 

     public override object GetService(Type serviceType) 
     { 
      try 
      { 
       return _container.Resolve(serviceType); 
      } 
      catch 
      { 
       return base.GetService(serviceType); 
      } 
     } 

     public override IEnumerable<object> GetServices(Type serviceType) 
     { 
      try 
      { 
       return _container.ResolveAll(serviceType); 
      } 
      catch 
      { 
       return base.GetServices(serviceType); 
      } 
     } 

     #endregion 
    } 

樞紐：

public class Chat : Hub 
    { 
     [Dependency] 
     public UserService _userService { get; set; } 

     public void Send(string message) 
     {     
      _userService.SomeMethod();     
     } 
    } 

完美的作品！

Answer 3

在Hub中注入統一容器的另一種方法是創建您自己的HubActivator 試試這個。 https://stackoverflow.com/a/30887576/3000736