Question

我无法在应用程序中配置Autofac。感谢您的帮助。以下是例外的代码。如果您需要更多详细信息，请不要犹豫。谢谢！

Api Config

public static void Register(HttpConfiguration config)
{
    // Web API configuration and services
    var setings = config.Formatters.JsonFormatter.SerializerSettings;
    setings.ContractResolver = new CamelCasePropertyNamesContractResolver();
    setings.Formatting = Formatting.Indented;

    // Web API Cors
    var origin = "https://localhost:44381";
    EnableCorsAttribute cors = new EnableCorsAttribute(origin, "*", "*");
    config.EnableCors(cors);

    // DI
    var builder = new ContainerBuilder();

    builder.RegisterType<AlertRepository>()
        .As<IAlertRepository>();
    builder.RegisterType<UnitOfWork>()
        .As<IUnitOfWork>();
    builder.RegisterGeneric(typeof(Repository<>))
        .As(typeof(IRepository<>))
        .InstancePerRequest();
    builder.RegisterApiControllers(Assembly.GetExecutingAssembly());

    var container = builder.Build();
    GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container);

    // Web API routes
    config.MapHttpAttributeRoutes();
    config.Routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "api/{controller}/{id}",
        defaults: new { id = RouteParameter.Optional }
    );
}

工作单元类别

public class UnitOfWork : IUnitOfWork
{
        private readonly CRNetContext _context;

        public UnitOfWork(CRNetContext context)
        {
            _context = context;
            Alerts = new AlertRepository(_context);
        }

        public IAlertRepository Alerts { get; private set; }

        public int Complete()
        {
            return _context.SaveChanges();
        }

        public void Dispose()
        {
            _context.Dispose();
        }
}

异常

{ “ message”：“发生错误。”， “ exceptionMessage”：“尝试创建类型为'AlertsController'的控制器时发生错误。请确保该控制器具有无参数的公共构造函数。”， “ exceptionType”：“ System.InvalidOperationException”， “ stackTrace”：“在System.Web.Http.Controllers.HttpControllerDescriptor.CreateController（HttpRequestMessage请求，HttpControllerDescriptor controllerDescriptor，类型controllerType）\ r \ n在System.Web.Http.Controllers.HttpControllerDescriptor.CreateController（HttpRequestMessage请求）\ r \ n位于System.Web.Http.Dispatcher.HttpControllerDispatcher.d__15.MoveNext（）“， “ innerException”：{ “ message”：“发生错误。”， “ exceptionMessage”：“在激活特定注册时发生错误。有关详细信息，请参见内部异常。注册：Activator = AlertsController（ReflectionActivator），Services = [CRNET.API.Controllers.AlertsController]，Lifetime = Autofac.Core。 Lifetime.CurrentScopeLifetime，共享=无，所有权= OwnedByLifetimeScope --->激活特定注册期间发生错误。有关详细信息，请参见内部异常。注册：Activator = UnitOfWork（ReflectionActivator），服务= [CRNET.DAL.Persistance [.IUnitOfWork]，生命周期= Autofac.Core.Lifetime.MatchingScopeLifetime，共享=共享，所有权= OwnedByLifetimeScope --->在“ CRNET.DAL.Persistance”类型上都找不到“ Autofac.Core.Activators.Reflection.DefaultConstructorFinder”的构造函数可以使用可用的服务和参数来调用.UnitOfWork'：\ r \ n无法解析构造函数'Void .ctor（CRNET.DAL.Models.CRNet的参数'CRNET.DAL.Models.CRNetContext上下文'上下文”）。（有关详细信息，请参阅内部异常。）（有关详细信息，请参阅内部异常。）”， “ exceptionType”：“ Autofac.Core.DependencyResolutionException”， “ stackTrace”：“在Autofac.Core.Resolving.InstanceLookup.Activate（IEnumerable 1 parameters)\r\n at Autofac.Core.Resolving.InstanceLookup.Execute()\r\n at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable 1参数）\ r \ n在Autofac.Core.Resolving.ResolveOperation.Execute（IComponentRegistration注册，IEnumerable 1 parameters)\r\n at Autofac.Core.Lifetime.LifetimeScope.ResolveComponent(IComponentRegistration registration, IEnumerable 1参数）\ r \ n（位于Autofac.ResolutionExtensions.TryResolveService（IComponentContext上下文，服务服务，IEnumerable 1 parameters, Object& instance)\r\n at Autofac.ResolutionExtensions.ResolveOptionalService(IComponentContext context, Service service, IEnumerable 1个参数）\ r \ n，位于Autofac.ResolutionExtensions.ResolveOptional（IComponentContext上下文，类型为serviceType）\ r \ n C：\ projects \ autofac-webapi \ src \ Autofac.Integration.WebApi \ AutofacWebApiDependencyScope.cs：System.Web.Http.Dispatcher上的第76行\ r \ n中的Autofac.Integration.WebApi.AutofacWebApiDependencyScope.GetService（Type serviceType） DefaultHttpControllerActivator.GetInstanceOrActivator（HttpRequestMessage请求，类型controllerType，Func 1& activator)\r\n at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)", "innerException": { "message": "An error has occurred.", "exceptionMessage": "An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = UnitOfWork (ReflectionActivator), Services = [CRNET.DAL.Persistance.IUnitOfWork], Lifetime = Autofac.Core.Lifetime.MatchingScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'CRNET.DAL.Persistance.UnitOfWork' can be invoked with the available services and parameters:\r\nCannot resolve parameter 'CRNET.DAL.Models.CRNetContext context' of constructor 'Void .ctor(CRNET.DAL.Models.CRNetContext)'. (See inner exception for details.)", "exceptionType": "Autofac.Core.DependencyResolutionException", "stackTrace": " at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable 1个参数）\ r \ n在Autofac.Core.Resolving.InstanceLookup.b__5_0（）\ r \ n在Autofac.Core.Lifetime.LifetimeScope.GetOrCreateAndShare（ Guid id，Func 1 creator)\r\n at Autofac.Core.Resolving.InstanceLookup.Execute()\r\n at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable 1个参数）\ r \ n（位于Autofac.Core.Resolving.Instanc） eLookup.ResolveComponent（IComponentRegistration注册，IEnumerable 1 parameters)\r\n at Autofac.Core.Activators.Reflection.AutowiringParameter.<>c__DisplayClass0_0.<CanSupplyValue>b__0()\r\n at Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate()\r\n at Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable 1个参数）\ r \ n在Autofac.Core.Resolving.InstanceLookup.Activate（IEnumerable 1 parameters)", "innerException": { "message": "An error has occurred.", "exceptionMessage": "None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'CRNET.DAL.Persistance.UnitOfWork' can be invoked with the available services and parameters:\r\nCannot resolve parameter 'CRNET.DAL.Models.CRNetContext context' of constructor 'Void .ctor(CRNET.DAL.Models.CRNetContext)'.", "exceptionType": "Autofac.Core.DependencyResolutionException", "stackTrace": " at Autofac.Core.Activators.Reflection.ReflectionActivator.GetValidConstructorBindings(IComponentContext context, IEnumerable 1个参数）\ r \ n在Autofac.Core.Activators .Reflection.ReflectionActivator.ActivateInstance（IComponentContext上下文，IEnumerable 1 parameters)\r\n at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable 1个参数）” } } } }

Answer 1

无法解析参数'CRNET.DAL.Models.CRNetContext上下文'...

您永远不会在Autofac中注册类型CRNetContext。要修复它，请添加：

builder.RegisterType<CRNET.DAL.Models.CRNetContext>().AsSelf();

C＃-IoC-WebAPI 2上的Autofac依赖项注入

1 个答案: