在Web API和OWIN中使用简单注入器 [英] Using Simple Injector in Web API and OWIN

问题描述

我遇到的问题与此处描述的 并且我的设置几乎与此相同实际上基于本指南.当我在控制器中访问方法时，得到此

I'm experiencing the same problem as described here and my set up is almost identical to this that is actually based on this guide. When I access a method in my controller I get this

尝试创建类型的控制器时发生错误 'TestController'.确保控制器具有无参数 公共构造函数.

An error occurred when trying to create a controller of type 'TestController'. Make sure that the controller has a parameterless public constructor.

这是堆栈跟踪

at System.Web.Http.Dispatcher.DefaultHttpControllerActivator
  .Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, 
     Type controllerType)\r\n   
at System.Web.Http.Controllers.HttpControllerDescriptor
  .CreateController(HttpRequestMessage request)\r\n   
at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()

这是内部异常的堆栈跟踪

And here's the inner exception's stack trace

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

这是我的控制器的样子

public class TestController : ApiController
{
    private readonly ITestRepo _repo;
    public TestController(ITestRepo repo)
    {
        _repo = repo;
    }

    public IEnumerable<string> Get()
    {
        return new string[] { "value1", "value2" };
    }

    public string Get(int id)
    {
        return _repo.GetId(id);
    }
}

这是我设置简单注入器的方式

And here's how I set up Simple Injector

 public class Startup
 {        
   public void Configuration(IAppBuilder app)
   {
      // Create the container as usual.
      var container = new Container();
      // Register your types, for instance using the RegisterWebApiRequest
      // extension from the integration package:       
      container.RegisterWebApiRequest<ITestRepo, TestRepo>(); 

     container.RegisterWebApiControllers(GlobalConfiguration.Configuration);

      container.Verify();

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

      //
      ConfigureOAuth(app, container);

      var config = new HttpConfiguration();
      WebApiConfig.Register(config);
      app.UseWebApi(config);
   }
}

推荐答案

我遇到了相同的问题，但使用UnityDependencyResolver.但我认为它也应适用于SimpleInjectorWebApiDependencyResolver.尝试像这样注册您的解析器(作为 HttpConfiguration 的属性):

I had the same issue but with UnityDependencyResolver. But I think it should also work for SimpleInjectorWebApiDependencyResolver. Try to register your resolver like this (as a Property of HttpConfiguration):

public void Configuration(IAppBuilder app)
{
    var container = GetContainer(); // Initialise container

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

    WebApiConfig.Register(config);
    app.UseWebApi(config);
}

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