Question

在我的Asp.net MVC项目中

我有一个初始化统一容器的启动器。

我不知道为什么，但我得到了

System.Core.dll中出现未处理的“System.StackOverflowException”类型异常

我已经加倍检查，只在我的初始化程序中完成注册。

所有依赖关系仅在ctors中注入。

导致这种情况的原因是什么？

    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        WebApiConfig.Register(GlobalConfiguration.Configuration);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);

        Initializer.Initialize();
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }

BundleConfig.RegisterBundles(BundleTable.Bundles);

后失败

public static class Initializer
{
    private static bool isInitialize;
    private static readonly object LockObj = new object();
    private static IUnityContainer defaultContainer = new UnityContainer();

    static Initializer()
    {
        Initialize();
    }

    public static void Initialize()
    {
        if (isInitialize)
            return;

        lock (LockObj)
        {
            IUnityContainer container = defaultContainer;

            //registering Unity for MVC
            DependencyResolver.SetResolver(new UnityDependencyResolver(container));

            //registering Unity for web API
            //  GlobalConfiguration.Configuration.DependencyResolver = new Unity.WebApi.UnityDependencyResolver(container);

            #region managers
            container.RegisterType<ISettingsManager, SettingsManager>();

            container.RegisterType<IMamDataManager, MamDataManager>();

            container.RegisterType<IAppsDataManager, AppsDataManager>();
            #endregion

            #region Dals
            container.RegisterType<IDal<ClientService.DAL.EntityFramework.App>, AppsDal>();

            #endregion Dals

            #region cache
            container.RegisterType<ICache<string, ClientService.DAL.EntityFramework.Group>, GroupsCache>(new ContainerControlledLifetimeManager());

            container.RegisterType<ICache<string, ClientService.DAL.EntityFramework.App>, AppsCache>(new ContainerControlledLifetimeManager());

            container.RegisterType<ICache<string, SettingsServiceData>, SettingsServiceDataCache>(new ContainerControlledLifetimeManager());
            #endregion cache

            #region Pollers
            container.RegisterType<IPoller<ClientService.DAL.EntityFramework.Group>, GroupsPoller>(new ContainerControlledLifetimeManager());

            container.RegisterType<IPoller<ClientService.DAL.EntityFramework.App>, AppsPoller>(new ContainerControlledLifetimeManager());

            container.RegisterType<IPoller<SettingsServiceData>, SettingsPoller>(new ContainerControlledLifetimeManager());



            #endregion Pollers


            container.RegisterType<IDefaultConfigurationGroupSingleton, DefaultConfigurationGroupSingleton>(new ContainerControlledLifetimeManager());

            container.RegisterType<IApplicationLogger, Log4NetLogger>();

            if (!isInitialize)
            {
                isInitialize = true;
            }
        }
    }
}

Answer 1

不提供代码，我想这是由于循环依赖。另一个可能的原因是你的一个构造函数中有一个不正确的循环。

例如，A类需要解析B的实例; B类需要解析C类的实例，C类需要解析A的实例。这导致无限循环：

public class A
{
    public A(B b)
    {
    }
}

public class B
{
    public B(C c)
    {
    }
}

public class C
{
    public C(A a)
    {
    }
}

Answer 2

正如Rafael所提到的，这通常是由循环依赖引起的，但是如果你需要这些依赖，你可以通过手动解析其中的一些来修复它。

例如：

// Register the UnityContainer with itself
container.RegisterInstance<IUnityContainer>(container);

public class A
{
    public A(B b) {}
}

public class B
{
    public B(C c) {}
}

public class C
{
    private readonly IUnityContainer _container;
    private A _a => _container.Resolve<A>();

    public C(IUnityContainer container) {
        _container = container;
    }
}

这意味着可以在不需要了解A的情况下构建C，直到使用它为止：）

System.Core.dll中发生了未处理的“System.StackOverflowException”类型异常

2 个答案: