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我正在使用MEF动态加载wcf服务。 MyInstanceProvider属于我的服务所在的同一个物理库。代码在我的开发盒IIS7（64位）上工作，但在我的测试盒（32位）上抛出此异常。在我介绍MEF之前工作正常。当在服务器上托管MEF异常
我很疑惑为什么会发生这种情况？
public object GetInstance(InstanceContext context)
{
var lazyInstance = _container.GetExports(_serviceType, null, null).FirstOrDefault();
if (lazyInstance == null) throw new InvalidOperationException();
return lazyInstance.Value;
}
异常
System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.RuntimeModule.GetTypes()
at System.Reflection.Assembly.GetTypes()
at System.ComponentModel.Composition.Hosting.AssemblyCatalog.get_InnerCatalog()
at System.ComponentModel.Composition.Hosting.AssemblyCatalog.GetExports(ImportDefinition definition)
at System.ComponentModel.Composition.Hosting.DirectoryCatalog.<>c__DisplayClass1.<GetExports>b__0(ComposablePartCatalog catalog)
at System.Linq.Enumerable.<SelectManyIterator>d__14`2.MoveNext()
at System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ExportProvider.TryGetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition, IEnumerable`1& exports)
at System.ComponentModel.Composition.Hosting.ExportProvider.GetExports(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.AggregateExportProvider.GetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ExportProvider.TryGetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition, IEnumerable`1& exports)
at System.ComponentModel.Composition.Hosting.ExportProvider.TryGetExports(ImportDefinition definition, AtomicComposition atomicComposition, IEnumerable`1& exports)
at System.ComponentModel.Composition.Hosting.CompositionContainer.GetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ExportProvider.TryGetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition, IEnumerable`1& exports)
at System.ComponentModel.Composition.Hosting.ExportProvider.GetExports(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ExportProvider.GetExportsCore(Type type, Type metadataViewType, String contractName, ImportCardinality cardinality)
at System.ComponentModel.Composition.Hosting.ExportProvider.GetExports(Type type, Type metadataViewType, String contractName)
at MyInstanceProvider.GetInstance(InstanceContext context) in C:\CodeWorkspace\IDATT\Code\IDATT.Web.Services\MyInstanceProvider.cs:line 21
at MyInstanceProvider.GetInstance(InstanceContext context, Message message) in C:\CodeWorkspace\IDATT\Code\IDATT.Web.Services\MyInstanceProvider.cs:line 30
at System.ServiceModel.Dispatcher.InstanceBehavior.GetInstance(InstanceContext instanceContext, Message request)
at System.ServiceModel.InstanceContext.GetServiceInstance(Message message)
at System.ServiceModel.Dispatcher.InstanceBehavior.EnsureServiceInstance(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</
编辑：
遵循了这一博客帖子获得详细信息： http://weblogs.asp.net/kencox/archive/2010/08/24/fed-up-with-system-data-metadata-edm-objectitemassemblyloader.aspx
这里是我所看到的：
未能进行负载文件或程序集 'System.ServiceModel.DomainServices.EntityFramework，Version = 4.0.0.0, Culture = neutral，PublicKeyToken = 31bf3856ad364e35'或其一个 依赖关系。该系统找不到指定的文件。
我知道这是RIA服务。我确实使用这些，但不在这个位置，所以很奇怪。但不管怎么说。为什么它会抱怨这个图书馆？我应该添加那些作为参考并放入Bin文件夹？ （解决方案） 好的，我在使用RIA服务（甚至不使用，只是添加引用）的解决方案中的某处 因此，不知何故，所有的MEF都需要这些RIA引用。而且，RIA服务不是.NET Framework的一部分，所以我不得不这样做：http://blogs.msdn.com/b/deepm/archive/2010/03/15/are-you-a-hoster-and-want-to-support-ria-services.aspx
现在一切正常