C# · 12月 23, 2021

c# – 在Web API和OWIN中使用简单的注射器

我遇到与 described here相同的问题,我的设置几乎是 identical to this,实际上是基于 this guide.当我访问我的控制器中的一个方法,我得到这个

An error occurred when trying to create a controller of type
‘TestController’. Make sure that the controller has a parameterless
public constructor.@H_403_6@

这是堆栈跟踪@H_403_6@ 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@H_403_6@ 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,Type controllerType)

这是我的控制器的样子@H_403_6@ 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); }}

这就是我如何设置简单的注射器@H_403_6@ 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); }}解决方法 我有同样的问题,但使用UnityDependencyResolver.但是我认为它也适用于SimpleInjectorWebApiDependencyResolver.尝试注册您的解析器(如HttpConfiguration的属性): public void Configuration(IAppBuilder app){ var container = GetContainer(); // Initialise container HttpConfiguration config = new HttpConfiguration { DependencyResolver = new SimpleInjectorWebApiDependencyResolver(container); }; WebApiConfig.Register(config); app.UseWebApi(config);}