c# - 将 2 个 Autofac 容器合并为一个

Question

有没有办法将 2 个 autoface 容器合并为 1 个？我的意思是来自两个容器的所有注册都将包含在新容器中或者，可以将其中一个升级为另一个

例如:

public IContainer Merge(IContainer container1, IContainer container2)
{
     return ???;
}

我尝试遍历“container.ComponentRegistry.Registrations”并使用 containerBuilder 注册组件并升级第二个容器，但由于某些原因存在一些冲突

    Autofac.Core.DependencyResolutionException : An exception was thrown while executing a resolve operation. See the InnerException for details. ---> The provided instance has already been used in an activation request. Did you combine a provided instance with non-root/single-instance lifetime/sharing? (See inner exception for details.)
  ----> System.InvalidOperationException : The provided instance has already been used in an activation request. Did you combine a provided instance with non-root/single-instance lifetime/sharing?
   at Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.Core.Lifetime.LifetimeScope.ResolveComponent(IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.Core.Container.ResolveComponent(IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable`1 parameters, ref Object instance)
   at Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.Resolve(IComponentContext context, Type serviceType, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.Resolve(IComponentContext context, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.Resolve(IComponentContext context)
   at Bootstrap.Bootstrapper.CreatePersistentTimerAsyncExecuter(IContainer container)
   at Bootstrap.Bootstrapper.Monitor(IContainer container)
   at Bootstrap.Bootstrapper.Boot(Assembly[] assemblies)
   at Soluto.Telemetry.Processing.Core.IntegrationTests.TelemetryProcessingBootstrapperTests.Boot_With2TelemetryHandlersInAssembly_ResolvesSubscriberWithItsHandlers() in TelemetryProcessingBootstrapperTests.cs: line 88
--InvalidOperationException
   at Autofac.Core.Activators.ProvidedInstance.ProvidedInstanceActivator.ActivateInstance(IComponentContext context, IEnumerable`1 parameters)
   at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters)
   at Autofac.Core.Resolving.InstanceLookup.<Execute>b__0()
   at Autofac.Core.Lifetime.LifetimeScope.GetOrCreateAndShare(Guid id, Func`1 creator)
   at Autofac.Core.Resolving.InstanceLookup.Execute()
   at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.Core.Resolving.ResolveOperation.ResolveComponent(IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable`1 parameters)

有什么想法吗？

Answer 1

您可以使用自定义 IRegistrationSource。此接口(interface)包含一个 RegistrationsFor 方法，该方法返回特定 IService

的 IComponentRegistration 列表

public class CrossContainerRegistrationSource : IRegistrationSource
{
    public CrossContainerRegistrationSource(IComponentContext componentContext)
    {
        this._componentContext = componentContext;
    }

    private readonly IComponentContext _componentContext;

    public Boolean IsAdapterForIndividualComponents
    {
        get
        {
            return false;
        }
    }

    public IEnumerable<IComponentRegistration> RegistrationsFor(Service service, 
        Func<Service, IEnumerable<IComponentRegistration>> registrationAccessor)
    {
        return this._componentContext.ComponentRegistry.RegistrationsFor(service);
    }
}

你可以这样使用它:

container2.ComponentRegistry.AddRegistrationSource(new CrossContainerRegistrationSource(container1));

但请注意此解决方案，当您使用复杂范围场景时，它可能会引入问题。