为什么即使我使用 ninject 注入依赖项，我仍会收到 MissingMethodException？

Question

当我尝试访问“考试”视图时，出现此错误。不明白，因为好像一切正​​常。

错误：

[MissingMethodException: No constructor without parameters has been defined for this object.] System.RuntimeTypeHandle.CreateInstance (RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean & canBeCached, RuntimeMethodHandleInternal & ctor, Boolean & bNeedSecurityCheck) +0 System.RuntimeType.CreateInstanceSlow (Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark & ​​stackMark) +122 System.RuntimeType.CreateInstanceDefaultCtor (Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark & ​​stackMark) +239 System.Activator.CreateInstance (Type type, Boolean nonPublic) +85 System.Activator.CreateInstance (Type type) +12 System.Web.Mvc.DefaultControllerActivator.Create (RequestContext requestContext, Type controllerType) +55

[InvalidOperationException: An error occurred when trying to create a controller of type 'ConsultaH.MVC.Controllers.ExamesController'. Make sure the controller has a parameterless public constructor.] System.Web.Mvc.DefaultControllerActivator.Create (RequestContext requestContext, Type controllerType) +178 System.Web.Mvc.DefaultControllerFactory.GetControllerInstance (RequestContext requestContext, Type controllerType) +80 System.Web.Mvc.DefaultControllerFactory.CreateController (RequestContext requestContext, String controllerName) +102 System.Web.Mvc.MvcHandler.ProcessRequestInit (HttpContextBase httpContext, IController & controller, IControllerFactory & factory) +188 System.Web.Mvc.MvcHandler.BeginProcessRequest (HttpContextBase httpContext, AsyncCallback callback, Object state) +50 System.Web.Mvc.MvcHandler.BeginProcessRequest (HttpContext httpContext, AsyncCallback callback, Object state) +48 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest (HttpContext context, AsyncCallback cb, Object extraData) +16 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute () +105 System.Web.HttpApplication.ExecuteStepImpl (IExecutionStep step) +50 System.Web.HttpApplication.ExecuteStep (IExecutionStep step, Boolean & completedSynchronously) +163

我里面的代码NinjectWebCommon.cs:

private static void RegisterServices(IKernel kernel)
{
            kernel.Bind(typeof(IAppServiceBase<>)).To(typeof(AppServiceBase<>));
            kernel.Bind<IPacienteAppService>().To<PacienteAppService>();
            kernel.Bind<IExameAppService>().To<ExameAppService>();
            kernel.Bind<ITipoExameAppService>().To<TipoExameAppService>();
            kernel.Bind<IConsultaAppService>().To<ConsultaAppService>();

            kernel.Bind(typeof(IServiceBase<>)).To(typeof(ServiceBase<>));
            kernel.Bind<IPacienteService>().To<PacienteService>();
            kernel.Bind<IExameService>().To<ExameService>();
            kernel.Bind<ITipoExameService>().To<TipoExameService>();
            kernel.Bind<IConsultaService>().To<ConsultaService>();

            kernel.Bind(typeof(IRepositoryBase<>)).To(typeof(RepositoryBase<>));
            kernel.Bind<IPacienteRepository>().To<PacienteRepository>();
            kernel.Bind<IExameRepository>().To<ExameRepository>();
            kernel.Bind<ITipoExameRepository>().To<TipoExameRepository>();
            kernel.Bind<IConsultaRepository>().To<ConsultaRepository>();

}

我的ExamesController.csclass:

public class ExamesController : Controller
{
        private readonly IExameAppService _exameApp;       

        public ExamesController(IExameAppService exameApp)
        {
            _exameApp = exameApp;            
        }

        // GET: Exame
        public ActionResult Index()
        {
            var exames = _exameApp.GetAll();
            var exameViewModel = Mapper.Map<IEnumerable<Exame>, IEnumerable<ExameViewModel>>(exames);            

            return View(exameViewModel);
        }
}    

我在方法 CreateKernel() class NinjectWebCommon.cs 中放置了一个断点并且总是尝试后到达第一行时出现错误，此错误发生在 运行 时间。请参阅下面的代码：

private static IKernel CreateKernel()
{
            var kernel = new StandardKernel();
            try
            {
                kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel); // <= This line
                kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
                RegisterServices(kernel);
                return kernel;
            }
            catch
            {
                kernel.Dispose();
                throw;
            }
}

我研究了很多，在这种情况下找不到任何解决方案。

Answer 1

要解决此错误，我所要做的就是卸载 Ninject 默认包并安装名为 Ninject MVC5 的包。