asmx - 使用 Autofac 2.1.12 解析 ASMX 中的 HttpRequestScoped 服务

Question

描述 我有一个遗留类型 HttpRequestScoped以及使用该服务的遗留 Web 服务。为了解决遗留问题中的服务，我有一个全局解析器。这一切在 1.4 中运行良好，现在我正在使用 2.1.12，我正在经历 DependencyResolutionException .

代码在 2.1.12 中，我的 Global.asax.cs:

builder.Register(c => new SomeLegacyType(HttpContext.Current)) // note: it relies on HttpContext.Current
.As<SomeLegacyType>()
.HttpRequestScoped();

_containerProvider = new ContainerProvider(builder.Build()); // this is my app's IContainerProvider
Setup.Resolver = new AutofacResolver(_containerProvider.ApplicationContainer);

Setup.Resolver 是一个单例，它被设置为 AutofacResolver，如下所示:

public class AutofacResolver : IResolver
{
    private readonly IContainer _container;

    public AutofacResolver(IContainer container)
    {
        _container = container;
    }

    public TService Get<TService>()
    {
        return _container.Resolve<TService>();
    }
}

网络服务如下所示:

[WebService]
public LegacyWebService : WebService
{
   [WebMethod(EnableSession=true)]
   public String SomeMethod() 
   {
      var legacyType = Setup.Resolver.Get<SomeLegacyType>();
   }
}

异常 当 Setup.Resolver.Get<SomeLegacyType>() 时出现以下异常称为:

Autofac.Core.DependencyResolutionException: No scope matching the expression 'value(Autofac.Builder.RegistrationBuilder`3+<>c__DisplayClass0[SomeAssembly.SomeLegacyType,Autofac.Builder.SimpleActivatorData,Autofac.Builder.SingleRegistrationStyle]).lifetimeScopeTag.Equals(scope.Tag)' is visible from the scope in which the instance was requested. 
at Autofac.Core.Lifetime.MatchingScopeLifetime.FindScope(ISharingLifetimeScope mostNestedVisibleScope)
   at Autofac.Core.Resolving.ComponentActivation..ctor(IComponentRegistration registration, IResolveOperation context, ISharingLifetimeScope mostNestedVisibleScope)
   at Autofac.Core.Resolving.ResolveOperation.Resolve(ISharingLifetimeScope activationScope, IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.Core.Lifetime.LifetimeScope.Resolve(IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.Core.Container.Resolve(IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.TryResolve(IComponentContext context, Service service, IEnumerable`1 parameters, Object& instance)
   at Autofac.ResolutionExtensions.Resolve(IComponentContext context, Service service, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.Resolve[TService](IComponentContext context, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.Resolve[TService](IComponentContext context)

附带问题是否有更好的方法在 ASMX 中注入(inject)属性，就像注入(inject) ASPX 页面一样(而不是使用 Setup.Resolver )？我用AttributedInjectionModule因为遗产问题。该模块似乎不适用于 ASMX。

Answer 1

如果您将“解析器”配置为使用 RequestLifetime 而不是 ApplicationContainer，则所有操作都应按预期工作。

这意味着您的 IContainer 参数必须更改为 ILifetimeScope。

我不确定是否有更好的方法来注入(inject) ASMX 依赖项，可能有一个，但我认为 Autofac 不支持它。