‘System.Data.Entity.Internal.AppConfig’的类型初始值设定项在子网站上引发了一个例外
我有2个网站，一个是另一个的子目录，但是是一个Application ex：/ root＆/ root / Services
他们都使用Entity Framework 6.x，但子网站正在抛出System.Data.Entity.Internal.AppConfig的类型初始化程序’引发了一个exception，因为它看起来因为嵌套而看到同一个EF数据库提供程序的许多条目web.config中
有没有办法清除提供程序集合，以便我不会收到此错误？ 我试过放入哪个没效果。
如果我注释掉提供者部分它是有效的
但我不想这样做，因为不是每个环境都会有嵌套网站。 并且NuGet倾向于将其重新插入。我可以通过编程方式进行调整吗？
这是完整的exception和堆栈跟踪
System.TypeInitializationException was unhandled by user code HResult=-2146233036 Message=**The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception.** Source=EntityFramework TypeName=System.Data.Entity.Internal.AppConfig StackTrace: at System.Data.Entity.Internal.AppConfig.get_DefaultInstance() at System.Data.Entity.Internal.LazyInternalConnection..ctor(String nameOrConnectionString) at System.Data.Entity.DbContext..ctor(String nameOrConnectionString) at co.Repository.Data.coContext..ctor() in coModel.Context.Generated.cs:line 23 at co.Repository.RepositoryBase`1.SingleOrDefault(Expression`1 predicate) in co.Repository\RepositoryBase.cs:line 13 at UserFactory.GetOneByUserName(String siteCode, String userName) in UserFactory.cs:line 151 at UserService.GetOneByUserName(String siteCode, String userName) in UserService.cs:line 59 at SyncInvokeGetOneByUserName(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) InnerException: System.Configuration.ConfigurationErrorsException HResult=-2146232062 Message=An error occurred creating the configuration section handler for entityFramework: **The provider for invariant name 'System.Data.SqlClient' is specified multiple times in the application configuration. The invariant name must be unique for each configured provider.** (web.config line 339) Source=System.Configuration BareMessage=An error occurred creating the configuration section handler for entityFramework: The provider for invariant name 'System.Data.SqlClient' is specified multiple times in the application configuration. The invariant name must be unique for each configured provider. Filename=web.config Line=339 StackTrace: at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult) at System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject) at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject) at System.Configuration.BaseConfigurationRecord.GetSection(String configKey) at System.Configuration.ConfigurationManager.GetSection(String sectionName) at System.Data.Entity.Internal.AppConfig..ctor() at System.Data.Entity.Internal.AppConfig..cctor() InnerException: System.InvalidOperationException HResult=-2146233079 Message=The provider for invariant name 'System.Data.SqlClient' is specified multiple times in the application configuration. The invariant name must be unique for each configured provider. Source=EntityFramework StackTrace: at System.Data.Entity.Internal.ConfigFile.ProviderCollection.BaseAdd(ConfigurationElement element) at System.Configuration.ConfigurationElementCollection.OnDeserializeUnrecognizedElement(String elementName, XmlReader reader) at System.Configuration.ConfigurationElement.DeserializeElement(XmlReader reader, Boolean serializeCollectionKey) at System.Configuration.ConfigurationElement.DeserializeElement(XmlReader reader, Boolean serializeCollectionKey) at System.Configuration.RuntimeConfigurationRecord.RuntimeConfigurationFactory.CreateSectionImpl(RuntimeConfigurationRecord configRecord, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentConfig, ConfigXmlReader reader) at System.Configuration.RuntimeConfigurationRecord.RuntimeConfigurationFactory.CreateSectionWithRestrictedPermissions(RuntimeConfigurationRecord configRecord, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentConfig, ConfigXmlReader reader) at System.Configuration.RuntimeConfigurationRecord.CreateSection(Boolean inputIsTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentConfig, ConfigXmlReader reader) at System.Configuration.BaseConfigurationRecord.CallCreateSection(Boolean inputIsTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentConfig, ConfigXmlReader reader, String filename, Int32 line) InnerException:
在EF6中，您可以使用代码库配置 – 请查看本文以获取更多详细信息。
编辑
我检查了对EF6代码的更改 ，其中忽略了完全重复。 这应该可以解决您的问题。 请注意，这不适合6.0.2版本，应该包含在6.0.2之后的下一个版本中。
我遇到过同样的问题。
我只是通过更新版本号解决了这个错误：
版本= 5.0.0.0
至：
版本= 6.0.0.0
例：
我有一个带有嵌套网站的EF 4.3.1的问题。
两个站点都使用相同的库和连接字符串…错误是由于明显重复造成的
它可能是从父站点加载连接字符串，然后无法加载子站点的字符串。
在您的子站点中，添加：