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我似乎无法化解这似乎是与实体框架的一个常见问题6.我已经审查了与这个问题上，因此将许多话题，而我无法找到适合有效的解决方案我的特殊情况。ADO.NET提供者System.Data.SqlClient的;“无法找到（实体框架MVC）
我一直在使用localdb开发代码优先迁移，这工作得很好。但是现在我将它移动到实际的SQL服务器实例，它在尝试迁移时会引发以下错误：
“具有不变名称的System.Data.SqlClient的ADO.NET提供程序”或者未在机器或应用程序配置文件中注册，或无法加载。请参阅内部异常的详细信息。 在System.Data.Common.DbProviderFactories.GetFactory（字符串providerInvariantName）”
我已尝试以下修正：
1）卸载和重新安装实体框架
2）增加了code和使用：
public abstract class BaseDomainContext : DbContext
{
static BaseDomainContext()
{
// ROLA - This is a hack to ensure that Entity Framework SQL Provider is copied across to the output folder.
// As it is installed in the GAC, Copy Local does not work. It is required for probing.
// Fixed "Provider not loaded" error
var ensureDLLIsCopied = System.Data.Entity.SqlServer.SqlProviderServices.Instance;
}
}
作为用于我的DbSet基类类。
3）添加的一切新溶液和接收到的同样的错误。
4）删除了writecontext，并尝试迁移只读，仍然失败。
5）试图重写几个利用MSDN
6信息）我已经证实，EntityFramework.SqlServer.dll是在我的bin目录。它也被正确引用。另外，我只有一个在我的解决方案项目。
7）确认我没有在视图下使用WebConfig。
8）确认我有System.Data dll bin文件夹中。
清洁/再造与现有的迁移删除文件夹中每个的上述步骤之后进行。
我茫然地解释为什么我还是我收到此错误。
Web配置
<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>
<appSettings>
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<connectionStrings>
<add name="ReadContext" connectionString="Server=Sql2014intsnace;Database=database;User Id=secret; Password=secret;" providerName="System.Data.SqlClient;" />
<add name="WriteContext" connectionString="Server=Sql2014intsnace;Database=database;User Id=secret; Password=secret;" providerName="System.Data.SqlClient;" />
</connectionStrings>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
<authentication mode="Windows" />
<authorization>
<deny users="?" />
</authorization>
</system.web>
<system.webServer>
<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="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security.OAuth" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security.Cookies" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
</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.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-5.2.2.0" newVersion="5.2.2.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
</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>
<contexts>
<context type="ProjectName.Models.ReadContext, ProjectName">
<databaseInitializer type="System.Data.Entity.MigrateDatabaseToLatestVersion`2[[ProjectName.Models.ReadContext, ProjectName], [ProjectName.Migrations.Configuration, ProjectName]], EntityFramework" />
</context>
</contexts>
</entityFramework>
</configuration>
听起来像缺少'System.Data.dll' – jsanalytics
我添加了更多信息，请参阅bin文件夹的图像。它正在复制。 – Rasen244
是的，那确实是问题所在。 – Rasen244