Question

有没有办法可以将2个autoface容器合并为1个？我的意思是两个容器的所有注册都将包含在新容器中或者，也可以用其他

升级其中一个

例如：

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

我已尝试迭代＆＃34; container.ComponentRegistry.Registrations＆＃34;并通过使用containerBuilder注册组件和升级第二个容器但由于某种原因存在一些冲突

    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)

任何想法？

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方法基本上将existingContainer的内容合并到newContainerBuilder。

编辑 - 如果使用IContainer

如果您已将ContainerBuilder构建为IContainer，则Update的{{1}}方法可以接受ContainerBuilder作为输入。但在这种情况下，已构建的容器现在将包含所有注册，新的IContainer可能超出范围。

ContainerBuilder

Answer 2

您可以使用自定义IRegistrationSource。此界面包含RegistrationsFor方法，该方法返回特定IComponentRegistration

的IService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);
    }
}

你可以像这样使用它：

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

但是在使用复杂范围方案时，请注意此解决方案可能会引入问题。

Answer 3

感谢所有答案的人，最后我做了一些更符合我需求的事情：

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

应该注意的是，Update()在较新版本的Autofac中已标记为过时，不应使用。有关详细说明，请参阅https://github.com/autofac/Autofac/issues/811#issuecomment-270246744。

为解决此问题而列出的一些建议是：

传递ContainerBuilder而不是IContainer
将注册添加到子范围
使用Lambdas
使用模块
使用条件注册（4.4.0中的新增内容）

基本上......如果可能的话，不要以2个容器结束。

将2个Autofac容器合并为一个

4 个答案:

编辑 - 如果使用IContainer