Question

我正在尝试将Unity IoC容器设置为ASP.NET mvc4应用程序。我创建了空项目并使用包管理控制台安装了下一个产品

Install-Package Unity
安装包Unity.Mvc4

一切顺利完成。但在我运行我的应用程序后，我有异常

描述：执行当前Web请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。异常详细信息：System.MissingMethodException：无法创建接口的实例。

这是简单的代码。的global.asax.cs

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();

        WebApiConfig.Register(GlobalConfiguration.Configuration);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);

        Bootstrapper.Initialise();
    }
}

public interface IA
{
    void test();
}
public class A : IA
{
    public A() { }
    public void test()
    {
        throw new NotImplementedException();
    }
}

HomeController.cs

public class HomeController : Controller
{
    //
    // GET: /Home/

    public ActionResult Index(IA a)
    {
        return View();
    }

}

Bootstrapper.cs：

public static class Bootstrapper
{
    public static void Initialise()
    {
        var container = BuildUnityContainer();

        DependencyResolver.SetResolver(new UnityDependencyResolver(container));
    }

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

        container.RegisterType<IA, A>();          

        return container;
    }
}

我做错了什么以及为什么代码不起作用？

堆栈追踪：

堆栈跟踪：[MissingMethodException：无法创建接口的实例。] System.RuntimeTypeHandle.CreateInstance（RuntimeType类型，Boolean publicOnly，Boolean noCheck，Boolean＆amp; canBeCached，RuntimeMethodHandleInternal＆amp; ctor，Boolean＆amp; bNeedSecurityCheck）+0 System.RuntimeType.CreateInstanceSlow（Boolean publicOnly，Boolean skipCheckThis，Boolean fillCache）+98 System.RuntimeType.CreateInstanceDefaultCtor（Boolean publicOnly，Boolean skipVisibilityChecks，Boolean skipCheckThis，Boolean fillCache）+241 System.Activator.CreateInstance（Type type，Boolean nonPublic）+69 System.Web.Mvc.DefaultModelBinder.CreateModel（ControllerContext controllerContext，ModelBindingContext bindingContext，Type modelType）+199 System.Web.Mvc.DefaultModelBinder.BindComplexModel（ControllerContext controllerContext，ModelBindingContext bindingContext）+572 System.Web.Mvc.DefaultModelBinder.BindModel（ControllerContext controllerContext，ModelBindingContext bindingContext）+454 System.Web.Mvc.ControllerActionInvoker.GetParameterValue（ControllerContext controllerContext，ParameterDescriptor parameterDescriptor）+317 System.Web.Mvc.ControllerActionInvoker.GetParameterValues（ControllerContext controllerContext，ActionDescriptor actionDescriptor）+117 System.Web.Mvc.Async。＆lt;＆gt; c_ DisplayClass25.b _1e（AsyncCallback asyncCallback，Object asyncState）+476 System.Web.Mvc.Async.WrappedAsyncResult 1.Begin(AsyncCallback callback, Object state, Int32 timeout) +124 System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +304 System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__17(AsyncCallback asyncCallback, Object asyncState) +30 System.Web.Mvc.Async.WrappedAsyncResult 1.Begin（AsyncCallback回调，对象状态，Int32超时）+124 System.Web.Mvc.Controller.BeginExecuteCore（AsyncCallback callback，Object state）+389 System.Web.Mvc.Async.WrappedAsyncResult 1.Begin(AsyncCallback callback, Object state, Int32 timeout) +124 System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +319 System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +15 System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__2(AsyncCallback asyncCallback, Object asyncState) +76 System.Web.Mvc.Async.WrappedAsyncResult 1.Begin（AsyncCallback回调，对象状态，Int32超时）+124 System.Web.Mvc.MvcHandler.BeginProcessRequest（HttpContextBase httpContext，AsyncCallback回调，对象状态）+251 System.Web.Mvc.MvcHandler.BeginProcessRequest（HttpContext httpContext，AsyncCallback回调，对象状态）+50 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest（HttpContext context，AsyncCallback cb，Object extraData）+16 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（）+8837208 System.Web.HttpApplication.ExecuteStep（IExecutionStep step，Boolean＆amp; completedSynchronously）+184

Answer 1

我完全不知道你的错是什么，但这里的设置对我有用;

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

    private static IUnityContainer BuildUnityContainer()
    {
        var container = new UnityContainer();
        container.RegisterType<ICategoryRepository, CategoryRepository>(new HierarchicalLifetimeManager());
        return container;
    }
}

Global.asax中

 Bootstrapper.Initialise();

现在，在我的控制器构造函数中;

ICategoryRepository _catRepo;

public CategoryController(ICategoryRepository catRepo)
{
    _catRepo = catRepo;
}
public ActionResult Index()
{
    ViewBag.CategoriesList = _catRepo.GetAllCategories();
    return View();
}

Microsoft Unity IoC无法运行和ASP.NET mvc4应用程序。为什么？

1 个答案: