SimpleInjector验证正常，但在第一次请求时抛出无参数构造函数错误

Question

我创建了一个.NET 4.5 WebApi应用程序，我试图使用SimpleInjector。

一切似乎注册好 - 当我做container.Verify()时，我的WebApi控制器加载与注入构造函数的相关对象。

然而，当我打我的终点，我在尝试创建类型‘XxxController’的控制器时发生了臭名昭著的“错误。请确保该控制器具有一个无参数的公共构造函数。

我IOC配置低于：

Startup.IoC.cs

public Container ConfigureIoC(IAppBuilder app) 
{ 
    var container = new Container(); 
    container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle(); 

    RegisterInstances(container); 

    GlobalConfiguration.Configuration.DependencyResolver = 
     new SimpleInjectorWebApiDependencyResolver(container); 

    app.Use(async (context, next) => 
    { 
     using (AsyncScopedLifestyle.BeginScope(container)) 
     { 
      await next(); 
     } 
    }); 

    return container; 
} 

private void RegisterInstances(Container container) 
{ 
    RegisterWebApiControllers(container); 
    // Other registrations here 

    container.Verify(); 
} 

private void RegisterWebApiControllers(Container container) 
{ 
    container.RegisterWebApiControllers(GlobalConfiguration.Configuration); 
} 

异常

尝试创建'LocationController'类型的控制器时发生错误。确保控制器有一个无参数的公共构造函数。

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() 

的InnerException

类型 'IP2LocationAPI.Web.Controllers.v1.LocationController' 没有默认的构造函数

at System.Linq.Expressions.Expression.New(Type type) 
at System.Web.Http.Internal.TypeActivator.Create[TBase](Type instanceType) 
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator) 
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType) 

Answer 1

这个答案固定它我：https://*.com/a/28231437/397852

基本上将依赖关系解析程序设置为针对HttpConfiguration实例而非GlobalConfiguration.Configuration方法起作用;

HttpConfiguration config = new HttpConfiguration 
    { 
     DependencyResolver = new SimpleInjectorWebApiDependencyResolver(container); 
    };