StructureMap:如何在运行时替换对象 [英] StructureMap: How to replace object at runtime

问题描述

我正在尝试将 ISession (NHibernate) 的模拟实例注入到结构映射中.目前，它全部以 Bootstrap 方法连接起来，但我想用模拟方法替换注入的方法.我试过 EjectAllInstancesOf 但它抛出了 execption.

I am trying to inject mocked instance of ISession (NHibernate) to structure map. Currently it all wires it up in a Bootstrap method, but I want to replace the one that is injected with a mocked one. I tried EjectAllInstancesOf but it throw execption.

 [TestFixtureSetUp]
        public void TestFixtureSetup()
        {
            Bootstrapper.Bootstrap();
           //TODO: need to remove already wired up types that we are mocking.
            var mockSession = MockRepository.GenerateStub<ISession>();
            var mockLoggerFactory = MockRepository.GenerateStub<ILoggerFactory>();

            ObjectFactory.EjectAllInstancesOf<ISession>();
            ObjectFactory.EjectAllInstancesOf<ILoggerFactory>();

            ObjectFactory.Inject<ISession>(mockSession);
            ObjectFactory.Inject<ILoggerFactory>(mockLoggerFactory);
        }

错误:

System.NullReferenceException: 未将对象引用设置为实例的一个对象.在StructureMap.Pipeline.HttpContextLifecycle.findHttpDictionary() 中c:\dev\opensource\structuremap\Source\StructureMap\Pipeline\HttpContextLifecycle.cs:在 StructureMap.Pipeline.HttpContextLifecycle.FindCache() 中的第 50 行c:\dev\opensource\structuremap\Source\StructureMap\Pipeline\HttpContextLifecycle.cs:在 StructureMap.Pipeline.HttpContextLifecycle.EjectAll() 中的第 28 行c:\dev\opensource\structuremap\Source\StructureMap\Pipeline\HttpContextLifecycle.cs:在 StructureMap.Pipeline.HttpLifecycleBase`2.EjectAll() 中的第 23 行c:\dev\opensource\structuremap\Source\StructureMap\Pipeline\HttpLifecycleBase.cs:在 StructureMap.InstanceFactory.EjectAllInstances() 中的第 18 行c:\dev\opensource\structuremap\Source\StructureMap\InstanceFactory.cs:在 StructureMap.PipelineGraph.EjectAllInstancesOf() 中的第 127 行c:\dev\opensource\structuremap\Source\StructureMap\PipelineGraph.cs:在 StructureMap.Container.EjectAllInstancesOf() 中的第 193 行c:\dev\opensource\structuremap\Source\StructureMap\Container.cs: 行393 在 StructureMap.ObjectFactory.EjectAllInstancesOf() 中c:\dev\opensource\structuremap\Source\StructureMap\ObjectFactory.cs:第 277 行

System.NullReferenceException: Object reference not set to an instance of an object. at StructureMap.Pipeline.HttpContextLifecycle.findHttpDictionary() in c:\dev\opensource\structuremap\Source\StructureMap\Pipeline\HttpContextLifecycle.cs: line 50 at StructureMap.Pipeline.HttpContextLifecycle.FindCache() in c:\dev\opensource\structuremap\Source\StructureMap\Pipeline\HttpContextLifecycle.cs: line 28 at StructureMap.Pipeline.HttpContextLifecycle.EjectAll() in c:\dev\opensource\structuremap\Source\StructureMap\Pipeline\HttpContextLifecycle.cs: line 23 at StructureMap.Pipeline.HttpLifecycleBase`2.EjectAll() in c:\dev\opensource\structuremap\Source\StructureMap\Pipeline\HttpLifecycleBase.cs: line 18 at StructureMap.InstanceFactory.EjectAllInstances() in c:\dev\opensource\structuremap\Source\StructureMap\InstanceFactory.cs: line 127 at StructureMap.PipelineGraph.EjectAllInstancesOf() in c:\dev\opensource\structuremap\Source\StructureMap\PipelineGraph.cs: line 193 at StructureMap.Container.EjectAllInstancesOf() in c:\dev\opensource\structuremap\Source\StructureMap\Container.cs: line 393 at StructureMap.ObjectFactory.EjectAllInstancesOf() in c:\dev\opensource\structuremap\Source\StructureMap\ObjectFactory.cs: line 277

推荐答案

您收到此异常是因为您的插件类型 (ISession) 在 StructureMap 中设置为 HttpContext 生命周期，并且单元测试中没有 HttpContext.这可能是 StructureMap 中的一个错误，它可能应该抛出它自己的异常来解释问题，而不是遇到 NullReferenceException.

You are getting this exception because your plugin type (ISession) is set up in StructureMap as a HttpContext lifecycle, and there is no HttpContext in a unit test. This is probably a bug in StructureMap, it should probably throw it's own exception explaining the problem instead of hitting a NullReferenceException.

无论如何，在您的单元测试设置 (Boostrapper) 中，将 ISession 的生命周期更改为 Hybrid 或 HttpContext 之外的其他内容.

at any rate, in your unit test setup (Boostrapper), change the lifecycle of ISession to Hybrid or something besides HttpContext.

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