Question

我将实体框架更新为6.0，现在我得到一个我无法弄清楚的例外。

为entityFramework创建配置节处理程序时发生错误：在应用程序配置中多次指定了不变名称“System.Data.SqlClient”的提供程序。对于每个已配置的提供程序，不变名称必须是唯一的。（C：\ inetpub \ wwwroot \ scrape \ Scrape \ web.config第106行）

'System.Data.Entity.Internal.AppConfig'的类型初始值设定项引发了异常。

web.config没有多次列出提供程序，我只有一个web.config用于整个项目。我很感激任何帮助。

堆栈跟踪

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）

位于c：\ inetpub \ wwwroot \ scrape \ Scrape.Data \ Contexts \ ScabsContext.cs中的Scrape.Data.Contexts.ScabsContext..ctor（）：第17行

位于c：\ inetpub \ wwwroot \ scrape \ Scrape.Data \ Repositories \ ScabStore.cs中的Scrape.Data.Repositories.ScabStore..ctor（）：第15行

位于c：\ inetpub \ wwwroot \ scrape \ Scrape \ Controllers \ ScabsController.cs中的Scrape.Api.Controllers.ScabsController.get_store（）：第28行

在scrape.Api.Controllers.ScabsController.Post（Scab scab）中的c：\ inetpub \ wwwroot \ scrape \ Scrape \ Controllers \ ScabsController.cs：第52行

在lambda_method（Closure，Object，Object []）

at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor。＆lt;＆gt; c_ DisplayClassc.b _6（Object instance，Object [] methodParameters）

at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute（Object instance，Object [] arguments）

at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync（HttpControllerContext controllerContext，IDictionary`2 arguments，CancellationToken cancellationToken）

我的web.config

<configuration>
  <configSections>
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
  </configSections>
  <connectionStrings>
    <add name="ScabContext" providerName="System.Data.SqlClient" connectionString="Data Source=bfleming-dev;Initial Catalog=scabs;User ID=scabs_dbo;Password=password" />
    <add name="lmsReadWrite" connectionString="Initial Catalog=caV2;Data Source=devsqlnow1.ca-schools.org;Network Library=dbmssocn;User Id=webuser;Password=hyqxYVTH9bjW;MultipleActiveResultSets=True;Application Name=connexus_main;" />
    <add name="lmsReadOnly" connectionString="Initial Catalog=caV2;Data Source=devsqlnow1.ca-schools.org;Network Library=dbmssocn;User Id=webuser;Password=hyqxYVTH9bjW;MultipleActiveResultSets=True;Application Name=connexus_main;" />
  </connectionStrings>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="PreserveLoginUrl" value="true" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
    <authentication mode="None" />
    <pages>
      <namespaces>
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Optimization" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.WebPages" />
      </namespaces>
    </pages>
    <profile defaultProvider="DefaultProfileProvider">
      <providers>
        <add name="DefaultProfileProvider" type="System.Web.Providers.DefaultProfileProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
      </providers>
    </profile>
    <membership defaultProvider="DefaultMembershipProvider">
      <providers>
        <add name="DefaultMembershipProvider" type="System.Web.Providers.DefaultMembershipProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />
      </providers>
    </membership>
    <roleManager defaultProvider="DefaultRoleProvider">
      <providers>
        <add name="DefaultRoleProvider" type="System.Web.Providers.DefaultRoleProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
      </providers>
    </roleManager>
    <!--
            If you are deploying to a cloud environment that has multiple web server instances,
            you should change session state mode from "InProc" to "Custom". In addition,
            change the connection string named "DefaultConnection" to connect to an instance
            of SQL Server (including SQL Azure and SQL  Compact) instead of to SQL Server Express.
      -->
    <sessionState mode="InProc" customProvider="DefaultSessionProvider">
      <providers>
        <add name="DefaultSessionProvider" type="System.Web.Providers.DefaultSessionStateProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" />
      </providers>
    </sessionState>
  </system.web>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
  </system.webServer>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-5.1.0.0" newVersion="5.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="EntityFramework" publicKeyToken="b77a5c561934e089" />
        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-1.3.0.0" newVersion="1.3.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-5.1.0.0" newVersion="5.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-5.1.0.0" newVersion="5.1.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
</configuration>

Answer 1

问题是configuration/entityFramework/providers部分为异常中指定的不变量提供了重复的提供程序。

<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />

即使您只指定了一个，但可能发生的情况是父目录中的.config文件中指定了一个。由于.config文件从父项继承配置，因此它看到它被定义了两次。

您可以安全地为此应用程序删除此提供程序。

基于CodePlex project，这已经在6.1.0-alpha1中被“修复”，忽略了完全相同的重复项。

Answer 2

尝试注释掉提供者部分，保存并重新运行。它可能与此The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception on a Sub Website

有关

Answer 3

我收到此错误是因为＆＃34; EntityFramework.SqlServer.dll＆＃34;文件未包含在此项目的发布中。将此DLL添加到Web服务器bin文件夹修复了该问题。

Answer 4

要解决此问题，我将父文件夹web.config entityFramework部分包装为：

<location path="." inheritInChildApplications="false">


<entityFramework>


...


<entityFramework>


</location>

请参阅https://stackoverflow.com/a/6199749/2718874

多次指定不变名称System.Data.SqlClient的提供程序

4 个答案: