Ninject + MVC3没有注入控制器

本文关键字：注入 控制器 MVC3 Ninject | 更新日期: 2023-09-27 17:53:14

我使用了NuGet Ninject MVC3扩展，并且无法根据请求将其注入控制器。它似乎没有绑定，因为MVC正在寻找无参数构造函数。下面是堆栈跟踪:

    [MissingMethodException: No parameterless constructor 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) +98
       System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache) +241
       System.Activator.CreateInstance(Type type, Boolean nonPublic) +69
       System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +67
    [InvalidOperationException: An error occurred when trying to create a controller of type 'MyApp.Presentation.Controllers.SearchController'. Make sure that the controller has a parameterless public constructor.]
       System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +182
       System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +80
       System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +74
       System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +199
       System.Web.Mvc.<>c__DisplayClass6.<BeginProcessRequest>b__2() +49
       System.Web.Mvc.<>c__DisplayClassb`1.<ProcessInApplicationTrust>b__a() +13
       System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7
       System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22
       System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Func`1 func) +124
       System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +98
       System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +50
       System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +16
       System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8862676
       System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184

和控制器我试图注入(它需要一个基类在此刻):

public class SearchController : MainBaseController
{
    private readonly MyApp.Domain.Tutor.TutorSearch TutorSearch;
    protected static readonly log4net.ILog _log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
    [Ninject.Inject]
    public SearchController(MyApp.Domain.Tutor.TutorSearch tutorSearch)
    {
        this.TutorSearch = tutorSearch;
    }
    .... (no other constructors)
}

和我的NinjectWebCommon.cs的相关部分:

    private static IKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
        kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
        RegisterServices(kernel);
        return kernel;
    }
    /// <summary>
    /// Load your modules or register your services here!
    /// </summary>
    /// <param name="kernel">The kernel.</param>
    private static void RegisterServices(IKernel kernel)
    {
        INinjectModule[] modules = new INinjectModule[]
        {
            new Domain.DomainModule()
        };
        kernel.Load(Assembly.GetExecutingAssembly());
        kernel.Load(modules);
        kernel.Bind<MyApp.Domain.Tutor.TutorSearch>().ToSelf();
        // ***************
        var t = kernel.Get<MyApp.Presentation.Controllers.SearchController>();
    }

最后是DomainModule:

public class DomainModule : NinjectModule
{
    public override void Load()
    {
        Bind<Data.Profile.IProfileProvider>().To<Data.Profile.XmlProfileProvider>();
        Bind<Data.Subject.ISubjectProvider>().To<Data.Subject.XmlSubjectProvider>();
    }
}

正如您可以在我的ninectwebcommon .cs中看到的，在标有星号的行中，我已经尝试显式地构建控制器作为测试。如果注入了正确的Xml，这就可以很好地工作。

我错过了什么吗?我不太了解NuGet MVC3扩展的底层发生了什么，所以不知道控制器绑定在什么时候失败。

Ninject + MVC3没有注入控制器

所以经过一段时间的不顾一切的修补，我终于找到了我的问题。我引用了MVC4 (System.Web.Mvc) dll，并且没有将旧的3.0.0.0版本的绑定重定向到4.0.0.0:

  <dependentAssembly>
    <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0" newVersion="4.0.0.0" />
    <bindingRedirect oldVersion="2.0.0.0" newVersion="4.0.0.0" />
    <!-- The following line was missing -->
    <bindingRedirect oldVersion="3.0.0.0" newVersion="4.0.0.0" /> 
  </dependentAssembly>

至少，我希望这是一个体面的解决方案。

编辑:按照下面的建议，下面这行更简洁:

  <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" />

使用Visual Studio和Nuget，你需要运行这个命令

安装包Ninject。MVC3

(根据您正在运行的MVC版本替换3)

这将解决你的问题

那么，您使用具体实现而不是接口有什么特别的原因吗?就目前的情况而言，直接导入类并没有给您带来任何好处(我很惊讶您居然能够正常工作)。我应该重构并将所有内容置于接口之后，然后将接口绑定到具体实现。

下面是一个简短的示例:

// 'imagined' ISearchType interface
public interface ISearchType
{
    int Id { get; set; }
    string LastName { get; set; }
}
// 'imagined' TutorSearch concrete class
public class TutorSearch : ISearchType
{
    public int Id { get; set; }
    public string LastName { get; set; }
}
// your revised controller code
private readonly ISearchType _tutorSearch;
public SearchController(ISearchType searchType)
{
    _tutorSearch = searchType;
}

那么，在注册服务时，您需要添加:

kernel.Bind<ISearchType>().To<TutorSearch>();

这应该能让你走得更远一点。此外，var t = kernel.Get<...>实际上什么也没做——以防你想知道"它"发生了什么。

玩得开心…

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