将 2 个 Autofac 容器合并为一个

Question

有什么方法可以将 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它可以将其中一个升级为另一个

例如：

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

我已经尝试遍历 "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

是的，这是可能的。

var existingContainer = new ContainerBuilder();
// Add registrations to existing container.

var newContainerBuilder = new ContainerBuilder();
// Add registrations to new container.

newContainterBuilder.Update(existingContainer);

update 方法本质上是将 existingContainer 的内容合并到 newContainerBuilder.

中

编辑 - 如果使用 IContainer

如果您已经将 ContainerBuilder 构建到 IContainer 中，ContainerBuilder 的 Update 方法能够接受 IContainer 作为输入。但是在这种情况下，已经构建的容器现在将包含所有注册，并且新的 ContainerBuilder 可以超出范围。

var builtContainer = existingContainer.Build();

var newContainerBuilder = new ContainerBuilder();
// Add registrations to new container.

newContainterBuilder.Update(builtContainer);

Answer 2

您可以使用自定义 IRegistrationSource。此接口包含一个 RegistrationsFor 方法，该方法 return 用于特定 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。

Answer 3

感谢大家的回答，最终我做了一些更具体的事情来满足我的需要：

public void Merge(this IContainer container1, IContainer container2)
{ 
    var newBuilder = new ContainerBuilder();
    newBuilder.RegisterInstance(container2.Resolve<ISomeService1>()).AsImplementedInterfaces();
    newBuilder.RegisterInstance(container2.Resolve<ISomeService2>()).AsImplementedInterfaces();

    newBuilder.Update(container1);
    return container1;
}

Answer 4

需要注意的是，Update() 在较新版本的 Autofac 中被标记为过时，不应使用。有关更多说明，请参阅 https://github.com/autofac/Autofac/issues/811#issuecomment-270246744。

列出的一些解决此问题的建议是：

传递 ContainerBuilder 而不是 IContainer
向子范围添加注册
使用 Lambdas
使用模块
使用条件注册（4.4.0 中的新功能）

基本上..如果可能，不要以 2 个容器结束。

将 2 个 Autofac 容器合并为一个

Merge 2 Autofac containers into one

c#

inversion-of-control

autofac

编辑 - 如果使用 IContainer