Autofac不分解式和命名參數ApiController

我已經全部建立具有相同業務層/數據層三個不同的應用程序。我將IUserNameProvider添加到所有三個應用程序使用的IUnitOfWork類中。因爲每個應用程序都使用不同的方法獲取用戶名，所以我創建了IUserNameProvider，並使用Autofac注入適當的實現。Autofac不分解式和命名參數ApiController

這似乎是它應該是相當簡單的代碼，但我不能讓它正確的Web API應用程序配置。類似的代碼在控制檯應用程序工作正常

我的Global.asax.cs

protected void Application_Start() 
{ 
    var builder = new ContainerBuilder(); 

    builder.RegisterType<WebAPIGetUser>().As<SSEMPA.DataAccess.Infrastructure.IUserNameProvider>(); 
    builder.RegisterType<UnitOfWork>().As<IUnitOfWork>() 
    .WithParameter("connectionString", ConfigurationManager.ConnectionStrings["MyDataContex"].ConnectionString); 

    //other type registrations ... 

    DependencyResolver.SetResolver(new AutofacDependencyResolver(builder.Build())); 

    // other registrations .... 
}

我的UnitOfWork構造

public class UnitOfWork : IUnitOfWork 
{ 
    private MyDataContext dataContext; 

    public UnitOfWork(IUserNameProvider userNameProvider, string connectionString) 
    { 
     dataContext = new MyDataContext (connectionString, userNameProvider); 
    } 

    ... 
}

我ApiController

public class AgencyApiController : ApiController 
{ 
    private readonly IUnitOfWork _unitOfWork; 

    public AgencyApiController(IUnitOfWork unitOfWork) 
    { 
     _unitOfWork = unitOfWork; 
    } 

    ... 
}

當API被擊中它會拋出以下錯誤：

<Error> 
    <Message>An error has occurred.</Message> 
    <ExceptionMessage>An error occurred when trying to create a controller of type 'AgencyApiController'. Make sure that the controller has a parameterless public constructor. 
    </ExceptionMessage> 
    <ExceptionType>System.InvalidOperationException</ExceptionType> 
    <StackTrace>at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType) at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request) at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext() 
    </StackTrace> 
    <InnerException> 
     <Message>An error has occurred.</Message> 
     <ExceptionMessage>None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'SSEMPA.DataAccess.Infrastructure.UnitOfWork' can be invoked with the available services and parameters: Cannot resolve parameter 'SSEMPA.DataAccess.Infrastructure.IUserNameProvider userNameProvider' of constructor 'Void .ctor(SSEMPA.DataAccess.Infrastructure.IUserNameProvider , System.String)'. 
     </ExceptionMessage> 
     <ExceptionType>Autofac.Core.DependencyResolutionException</ExceptionType>

我已經使用了IUserNameProvider和連接串都命名參數嘗試過，但沒有任何改變。這似乎應該工作，所以我必須錯過一些小事。

感謝您看這個。

來源

2014-10-12 Steve Wash

有額外的配置和設置您需要的WebAPI做，除了你之外控制檯應用程序做什麼。看看在這裏的文檔的說明：Autofac Web Api Integration

來源

2014-10-12 01:35:54

謝謝！其他人對此進行了配置，並且不在該項目中。我不知道是否已經有另一個配置。 – 2014-10-12 09:22:13

Autofac不分解式和命名參數ApiController

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