[英]Ninject.ActivationException was unhandled by user code
最近两天我一直在解决这个问题,我想做的是防止创建DisplayWeatherAstronomy实例,我以为它是在昨晚借助Tadmas在另一个线程上解决的,但是我遇到了Ninject的问题。
因此,我修改了代码,并使用接口将类转换为抽象类,但是Ninject仍然遇到问题,即使错误看起来很容易解释,我也不知道如何解决它。
我的错误是:
Ninject.ActivationException was unhandled by user code
HResult=-2146233088
Message=Error activating IDisplayWeatherAstronomy using binding from IDisplayWeatherAstronomy to GetWeatherAstronomyData
No constructor was available to create an instance of the implementation type.
Activation path:
2) Injection of dependency IDisplayWeatherAstronomy into parameter igwa of constructor of type WeatherController
1) Request for WeatherController
Suggestions:
1) Ensure that the implementation type has a public constructor.
2) If you have implemented the Singleton pattern, use a binding with InSingletonScope() instead.
Source=Ninject
StackTrace:
at Ninject.Activation.Providers.StandardProvider.Create(IContext context) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Providers\StandardProvider.cs:line 82
at Ninject.Activation.Context.Resolve() in c:\Projects\Ninject\ninject\src\Ninject\Activation\Context.cs:line 157
at Ninject.KernelBase.<>c__DisplayClass10.<Resolve>b__c(IBinding binding) in c:\Projects\Ninject\ninject\src\Ninject\KernelBase.cs:line 386
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
at Ninject.Planning.Targets.Target`1.GetValue(Type service, IContext parent) in c:\Projects\Ninject\ninject\src\Ninject\Planning\Targets\Target.cs:line 197
at Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent) in c:\Projects\Ninject\ninject\src\Ninject\Planning\Targets\Target.cs:line 165
at Ninject.Activation.Providers.StandardProvider.GetValue(IContext context, ITarget target) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Providers\StandardProvider.cs:line 114
at Ninject.Activation.Providers.StandardProvider.<>c__DisplayClass4.<Create>b__2(ITarget target) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Providers\StandardProvider.cs:line 96
at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at Ninject.Activation.Providers.StandardProvider.Create(IContext context) in c:\Projects\Ninject\ninject\src\Ninject\Activation\Providers\StandardProvider.cs:line 96
at Ninject.Activation.Context.Resolve() in c:\Projects\Ninject\ninject\src\Ninject\Activation\Context.cs:line 157
at Ninject.KernelBase.<>c__DisplayClass10.<Resolve>b__c(IBinding binding) in c:\Projects\Ninject\ninject\src\Ninject\KernelBase.cs:line 386
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
at Ninject.Web.Mvc.NinjectDependencyResolver.GetService(Type serviceType) in c:\Projects\Ninject\ninject.web.mvc\mvc3\src\Ninject.Web.Mvc\NinjectDependencyResolver.cs:line 56
at Castle.Proxies.Invocations.IDependencyResolver_GetService.InvokeMethodOnTarget()
at Castle.DynamicProxy.AbstractInvocation.Proceed()
at Glimpse.Core.Extensibility.CastleInvocationToAlternateMethodContextAdapter.Proceed()
at Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult)
at Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context)
at Glimpse.Core.Extensibility.AlternateTypeToCastleInterceptorAdapter.Intercept(IInvocation invocation)
at Castle.DynamicProxy.AbstractInvocation.Proceed()
at Castle.Proxies.IDependencyResolverProxy.GetService(Type serviceType)
at System.Web.Mvc.DefaultControllerFactory.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType)
InnerException:
码:
public abstract class GetWeatherAstronomyData : IDisplayWeatherAstronomy
{
public class DisplayWeatherAstronomy
{
public string SunRise { get; internal set; }
public string SunSet { get; internal set; }
public string MoonRise { get; internal set; }
public string MoonSet { get; internal set; }
}
public IEnumerable<DisplayWeatherAstronomy> WeatherAstronomy(string id)
{
var doc = WeatherForcast.WeatherLocationSearchXmlDataAsync(id);
var result = XDocument.Parse(doc.Result);
var displayAstronomy = (from wd in result.Descendants("astronomy")
select new DisplayWeatherAstronomy
{
SunRise = (string)wd.Element("sunrise") ?? string.Empty,
SunSet = (string)wd.Element("sunset") ?? string.Empty
});
return displayAstronomy;
}
}
接口
public interface IDisplayWeatherAstronomy
{
IEnumerable<GetWeatherAstronomyData.DisplayWeatherAstronomy> WeatherAstronomy(string id);
}
Ninject
private static void RegisterServices(IKernel kernel)
{
kernel.Bind<IDisplayWeatherAstronomy>()
.To<GetWeatherAstronomyData>()
.InSingletonScope();
}
最终控制人
private readonly IDisplayWeatherAstronomy _igwa;
public WeatherController(IDisplayWeatherAstronomy igwa)
{
_igwa = igwa;
}
最终解决此问题的任何帮助将不胜感激
乔治
您不能实例化一个抽象类。 Ninject也不能做到这一点。 从GetWeatherAstronomyData
删除abstract
修饰符。
如果要防止其他人实例化您的类,请将其与接口一起放入“额外”项目/程序集B中,并使其internal
,而不是public
(也不是abstract
!)。 该接口必须是public
。
然后还将ninject模块添加到同一程序集,这将创建绑定:
public class WeatherModule : NinjectModule
{
this.Bind<IDisplayWeatherAstronomy>().To<DisplayWeatherAstronomy>();
}
然后,在原始项目中,添加对项目/程序集B的引用并加载WeatherModule
:
kernel.Load<WeatherModule>();
而已。
但是请记住,仍然任何人都可以使用创建类
IResolutionRoot.Get<IDisplayWeatherAstronomy>();
因此,只有在可以限制对内核的访问的情况下,您才有收获,而这通常是不切实际的。
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