Silverlight 5.0應用prism的Mef容器總是報錯的解決方案

      如果本機安裝的是Silverlight 5.0版本，而你要用prism版本的Mef容器，就會一直出錯，出錯的信息是：Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.

       查看詳細的錯誤信息是：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.get_Parts()
   at Microsoft.Practices.Prism.MefExtensions.DefaultPrismServiceRegistrar.GetRequiredPrismPartsToRegister(AggregateCatalog aggregateCatalog)
   at Microsoft.Practices.Prism.MefExtensions.DefaultPrismServiceRegistrar.RegisterRequiredPrismServicesIfMissing(AggregateCatalog aggregateCatalog)
   at Microsoft.Practices.Prism.MefExtensions.MefBootstrapper.RegisterDefaultTypesIfMissing()
   at Microsoft.Practices.Prism.MefExtensions.MefBootstrapper.Run(Boolean runWithDefaultConfiguration)
   at Microsoft.Practices.Prism.Bootstrapper.Run()
   at SilverlightPrism.App.Application_Startup(Object sender, StartupEventArgs e)
   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(UInt32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags)

要解決這個錯誤的辦法是：把Silverlight客戶端的Silverlight版本改爲4.0就可以了，我不知道還有沒有其它更好的解決方案，如果有請指教了。

但如果你是用Sliverlight 5.0版本，而用prism的Unity容器的話，是沒有這個錯誤的。