试图获取IXXXXXController类型“键”的实例时发生激活错误

Question

当尝试使用ServiceLocator.Current.GetInstance()方法获取对象时，我们会遇到以下错误。

激活错误发生在试图获取IXXXXXController类型的实例时，键“”

在Microsoft.Internal.Collections.WeakReferenceCollection1.<CleanupDeadReferences>b__0(WeakReference w) at System.Collections.Generic.List1.RemoveAll(Predicate1 match) at Microsoft.Internal.Collections.WeakReferenceCollection1.CleanupDeadReferences() at Microsoft.Internal.Collections.WeakReferenceCollection`1.Add(T item) at System.ComponentModel.Composition.Hosting.ImportEngine.StartSatisfyingImports(PartManager partManager，AtomicComposition atomicComposition) at System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImports(PartManager partManager，ComposablePart part，System.ComponentModel.Composition.Hosting.ImportEngine.SatisfyImports(ComposablePart shouldTrackImports)在System.ComponentModel.Composition.Hosting.CompositionServices.GetExportedValueFromComposedPart(ImportEngine engine，ComposablePart part，

( System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportedValue(CatalogPart部件的ExportDefinition定义)，System.ComponentModel.Composition.Primitives.Export.get_Value()的ExportDefinition导出( System.ComponentModel.Composition.ReflectionModel.ImportingItem.Cast(Type类型)，System.ComponentModel.Composition.ReflectionModel.ImportingItem.CastSingleExportToImportType(Type类型的导出(System.ComponentModel.Composition.ReflectionModel.ImportingItem.CastSingleExportToImportType(Type))，(出口)在System.ComponentModel.Composition.ReflectionModel.ImportingItem.CastExportsToSingleImportType(Export[]出口)在System.ComponentModel.Composition.ReflectionModel.ImportingItem.CastExportsToImportType(Export[]出口)在System.ComponentModel.Composition.ReflectionModel.ReflectionComposablePart.SetImport(ImportingItem项目下，Export[]出口)在System.ComponentModel.Composition.ReflectionModel.ReflectionComposablePart.SetImport(ImportDefinition定义，IEnumerable1 exports) at System.ComponentModel.Composition.Hosting.ImportEngine.PartManager.TrySetImport(ImportDefinition import, Export[] exports) at System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImportSubset(PartManager partManager, IEnumerable1进口，AtomicComposition

(在System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImportsStateMachine(PartManager partManager，ComposablePart部件)在System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImports(PartManager partManager，ComposablePart部件，布尔shouldTrackImports(在System.ComponentModel.Composition.Hosting.ImportEngine.SatisfyImports(ComposablePart部件)在System.ComponentModel.Composition.Hosting.CompositionServices.GetExportedValueFromComposedPart(ImportEngine引擎，ComposablePart部件，

( System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportedValue(CatalogPart part，ExportDefinition导出，布尔型isSharedPart)在System.ComponentModel.Composition.Primitives.Export.get_Value() at System.ComponentModel.Composition.Primitives.Export.get_Value() at System.ComponentModel.Composition.ExportServices.GetCastedExportedValueT at System.ComponentModel.Composition.ExportServices.<>c__DisplayClass102.<CreateSemiStronglyTypedLazy>b__c() at System.Lazy1.CreateValue() at System.Lazy1.LazyInitValue() at System.Lazy1.get_Value() at Microsoft.Practices.Prism.MefExtensions.MefServiceLocatorAdapter.DoGetInstance(Type serviceType，( c:\release\WorkingDir中的字符串键)

\PrismLibraryBuild\PrismLibrary\Desktop\Prism.MefExtensions\MefServiceLocatorAdapter.cs:line 73 at Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type serviceType，字符串键)

我们正在设置类中的容器(内部覆盖无效ConfigureAggregateCatalog方法)，该容器来自MefBootstrapper，如下所示

this.AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(ClassName).Assembly));

我们已经观察到这个工作很好已经有一段时间了，但是当我们离开应用程序理想的几个小时时，我们开始得到错误。请提出导致此错误的原因，并对其进行修复。

谢谢

Answer 1

不要用MEF和棱镜。MEF的支持将在未来的版本中被放弃。请用真正的容器。