NancyFx 将接口传递给模块构造函数会导致错误答案

【问题标题】：NancyFx passing an Interface to a module constructor results in errorNancyFx 将接口传递给模块构造函数会导致错误
【发布时间】：2014-05-29 09:07:14
【问题描述】：

当我将接口传递给我的模块构造函数时，它会导致错误：Unable to resolve type: System.Web.HttpContextBase。下面是模块代码：

public class LeaderboardModule : NancyModule
{
    private readonly IUserService _userService;

    public LeaderboardModule(IUserService userService)
    {
        _userService = userService;

        Get["/"] = _ => View["Index"];

        Get["/NewUser"] = _ => View["NewUser.cshtml"];

        Post["/NewUser"] = _ => View["NewUser.cshtml"];

        Get["/UserList"] = _ =>
        {
            var userList = _userService.GetUsers();

            return View["UserList.cshtml", userList];
        };
    }
}

这是堆栈跟踪：

[TinyIoCResolutionException: Unable to resolve type: System.Web.HttpContextBase]
    Nancy.TinyIoc.TinyIoCContainer.ResolveInternal(TypeRegistration registration,     NamedParameterOverloads parameters, ResolveOptions options) +1940
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType,     ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +774

[TinyIoCResolutionException: Unable to resolve type: Metro.Leaderboard.Data.JsonService]
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType,   ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +965
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, ResolveOptions options) +99
   Nancy.TinyIoc.SingletonFactory.GetObject(Type requestedType, TinyIoCContainer container,   NamedParameterOverloads parameters, ResolveOptions options) +213
   Nancy.TinyIoc.TinyIoCContainer.ResolveInternal(TypeRegistration registration, NamedParameterOverloads parameters, ResolveOptions options) +225
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType,     ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +774

[TinyIoCResolutionException: Unable to resolve type: Metro.Leaderboard.Business.UserService]
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +965
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, ResolveOptions options) +99
   Nancy.TinyIoc.SingletonFactory.GetObject(Type requestedType, TinyIoCContainer container,    NamedParameterOverloads parameters, ResolveOptions options) +213
   Nancy.TinyIoc.SingletonFactory.GetFactoryForChildContainer(Type type, TinyIoCContainer parent,   TinyIoCContainer child) +100
   Nancy.TinyIoc.TinyIoCContainer.GetParentObjectFactory(TypeRegistration registration) +141
   Nancy.TinyIoc.TinyIoCContainer.ResolveInternal(TypeRegistration registration,   NamedParameterOverloads parameters, ResolveOptions options) +712
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +774

[TinyIoCResolutionException: Unable to resolve type:     Metro.Leaderboard.Web.Modules.LeaderboardModule]
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +965
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, ResolveOptions options) +99
   Nancy.TinyIoc.SingletonFactory.GetObject(Type requestedType, TinyIoCContainer container, NamedParameterOverloads parameters, ResolveOptions options) +213
   Nancy.TinyIoc.TinyIoCContainer.ResolveInternal(TypeRegistration registration, NamedParameterOverloads parameters, ResolveOptions options) +225
   Nancy.TinyIoc.TinyIoCContainer.<ResolveAllInternal>b__43(TypeRegistration registration) +91
   System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +145
   System.Linq.<CastIterator>d__b1`1.MoveNext() +85
   Nancy.Routing.RouteCache.BuildCache(IEnumerable`1 modules) +514
   Nancy.Routing.RouteCache..ctor(INancyModuleCatalog moduleCatalog, INancyContextFactory   contextFactory, IRouteSegmentExtractor routeSegmentExtractor, IRouteDescriptionProvider   routeDescriptionProvider, ICultureService cultureService) +189
   lambda_method(Closure , Object[] ) +221
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType,  ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +1100

    [TinyIoCResolutionException: Unable to resolve type: Nancy.Routing.RouteCache]
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +1178
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, ResolveOptions options) +99
   Nancy.TinyIoc.SingletonFactory.GetObject(Type requestedType, TinyIoCContainer container, NamedParameterOverloads parameters, ResolveOptions options) +213
   Nancy.TinyIoc.TinyIoCContainer.ResolveInternal(TypeRegistration registration, NamedParameterOverloads parameters, ResolveOptions options) +225
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +774

[TinyIoCResolutionException: Unable to resolve type: Nancy.Routing.DefaultRouteResolver]
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +965
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, ResolveOptions options) +99
   Nancy.TinyIoc.SingletonFactory.GetObject(Type requestedType, TinyIoCContainer container, NamedParameterOverloads parameters, ResolveOptions options) +213
   Nancy.TinyIoc.TinyIoCContainer.ResolveInternal(TypeRegistration registration, NamedParameterOverloads parameters, ResolveOptions options) +225
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +774

[TinyIoCResolutionException: Unable to resolve type: Nancy.Routing.DefaultRequestDispatcher]
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +965
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, ResolveOptions options) +99
   Nancy.TinyIoc.SingletonFactory.GetObject(Type requestedType, TinyIoCContainer container, NamedParameterOverloads parameters, ResolveOptions options) +213
   Nancy.TinyIoc.TinyIoCContainer.ResolveInternal(TypeRegistration registration, NamedParameterOverloads parameters, ResolveOptions options) +225
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +774

[TinyIoCResolutionException: Unable to resolve type: Nancy.NancyEngine]
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, NamedParameterOverloads parameters, ResolveOptions options) +965
   Nancy.TinyIoc.TinyIoCContainer.ConstructType(Type requestedType, Type implementationType, ConstructorInfo constructor, ResolveOptions options) +99
   Nancy.TinyIoc.SingletonFactory.GetObject(Type requestedType, TinyIoCContainer container, NamedParameterOverloads parameters, ResolveOptions options) +213
   Nancy.TinyIoc.TinyIoCContainer.ResolveInternal(TypeRegistration registration, NamedParameterOverloads parameters, ResolveOptions options) +225
   Nancy.TinyIoc.TinyIoCContainer.Resolve(Type resolveType) +106
   Nancy.TinyIoc.TinyIoCContainer.Resolve() +112
   Nancy.DefaultNancyBootstrapper.GetEngineInternal() +56
   Nancy.Bootstrapper.NancyBootstrapperBase`1.SafeGetNancyEngineInstance() +61

[InvalidOperationException: Something went wrong when trying to satisfy one of the dependencies  during composition, make sure that you've registered all new dependencies in the container and      inspect the innerexception for more details.]
   Nancy.Bootstrapper.NancyBootstrapperBase`1.SafeGetNancyEngineInstance() +135
   Nancy.Bootstrapper.NancyBootstrapperBase`1.GetEngine() +113
   Nancy.Hosting.Aspnet.NancyHttpRequestHandler..cctor() +65

[TypeInitializationException: The type initializer for 'Nancy.Hosting.Aspnet.NancyHttpRequestHandler' threw an exception.]
   Nancy.Hosting.Aspnet.NancyHttpRequestHandler..ctor() +0

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0
   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +113
    System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +232
    System.Activator.CreateInstance(Type type, Boolean nonPublic) +83
    System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark) +1136
    System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +128
    System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +18
    System.Web.HttpRuntime.CreateNonPublicInstance(Type type, Object[] args) +60
    System.Web.Configuration.HandlerFactoryCache..ctor(String type) +46
    System.Web.HttpApplication.GetFactory(String type) +86
    System.Web.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +262
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

我最初的想法是 Nancy 引导程序有问题，所以我决定使用StructureMap，但我仍然遇到同样的错误！对此的任何帮助将不胜感激

【问题讨论】：

标签： c# .net interface nancy bootstrapping

【解决方案1】：

堆栈跟踪告诉你所有你需要知道的——你的模块依赖于 UserService，而 UserService 依赖于 JsonService，它依赖于 HttpContextBase，它无法解决（因为你不应该真的使用它，或者如果你这样做了，你当然不应该将它作为构造函数依赖）

【讨论】：

这是为什么呢？我使用了HttpContextBase，所以我可以模拟编写一个用于单元测试目的的 json 文件
我实际上已经通过将x.For<HttpContextBase>().Use(() => new HttpContextWrapper(HttpContext.Current)); 添加到我的结构图中解决了这个问题，它已经解决了问题
为什么需要 httpcontext 来创建 json？您不应该真正将 httpcontext 与 nancy 一起使用，因为它会将您与 asp.net 主机联系起来（以及导致不良习惯:-)）
因为你需要httpContext来读写一个json文件
什么？我日复一日地使用 JSON，我什么都不使用 HttpContext :)