在Web API和OWIN中使用Simple Injector

Question

我遇到了與此處描述的問題相同的問題，我的設置幾乎完全相同 ，實際上是基於本指南 。 當我在我的控制器中訪問一個方法時，我得到了這個

嘗試創建“TestController”類型的控制器時發生錯誤。 確保控制器具有無參數的公共構造函數。

這是堆棧跟蹤

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()

這是內部異常的堆棧跟蹤

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)

這是我的控制器的樣子

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);
    }
}

這就是我如何設置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);
   }
}

Answer 1

我有同樣的問題但使用UnityDependencyResolver。 但我認為它也適用於SimpleInjectorWebApiDependencyResolver。 嘗試注冊這樣的解析器（作為HttpConfiguration的屬性）：

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

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

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