c# - ASP.Net MVC 4 Web API Controller 不适用于 Unity.WebApi

Question

我的 ASP.Net MVC 4 Web API Controller 不支持 Unity.WebApi。在同一个项目中，简单的 Controller 可以正确地与 Unity.Mvc3 配合使用。但是当我运行从 ApiController 派生的 Web API Controller 时，我收到一条消息:

{"$id":"1","Message":"An error has occurred.","ExceptionMessage":"Type 'ElectricTests.Controllers.Api.DocumentsController' does not have a default constructor","ExceptionType":"System.ArgumentException","StackTrace":" 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)"}

我的 API Controller :

public class DocumentsController : ApiController
{
    private readonly IDocumentsRepository _repository;

    public DocumentsController(IDocumentsRepository repository) {
        _repository = repository;
    }

    public IEnumerable<FormattedDocument> GetFormattedDocuments()
    {
        return _repository.GetAllFormattedDocuments();
    }
    ...

Bootstrapper.cs:

public static class Bootstrapper {
    public static void Initialise() {
        IUnityContainer container = BuildUnityContainer();
        DependencyResolver.SetResolver(new UnityDependencyResolver(container));
    }

    private static IUnityContainer BuildUnityContainer() {
        var container = new UnityContainer();

        // register all your components with the container here
        // it is NOT necessary to register your controllers
        // e.g. container.RegisterType<ITestService, TestService>();            

        container.RegisterType<IDocumentsRepository, DocumentsRepository>();
        container.RegisterType<IQuestionsRepository, QuestionsRepository>();
        container.RegisterType<ITestRepository, TestsRepository>();

        return container;
    }
}

我的错误在哪里？

Answer 1

Controller 和 ApiController 的处理方式不同，因为它们具有完全不同的基类:

我将 Unity.MVC4 库用于 Controller DI ( http://www.nuget.org/packages/Unity.MVC4/ )

Install-Package Unity.MVC4

和用于 DI 的 Unity.WebAPI ( http://www.nuget.org/packages/Unity.WebAPI/ )

Install-Package Unity.WebAPI

你的 Bootstrap 应该是两者的结合:

DependencyResolver.SetResolver(new Unity.Mvc4.UnityDependencyResolver(container));
GlobalConfiguration.Configuration.DependencyResolver = new Unity.WebApi.UnityDependencyResolver(container);

请注意，我还必须添加一些注册才能使帮助页面正常工作

container.RegisterInstance(typeof (HttpConfiguration), GlobalConfiguration.Configuration);

作为 Unity.MVC4 的所有者，我希望在我们的库中实现 WebApi。