Entity Framework Provider type could not be loaded?

Entity Framework Provider type could not be loaded?

I am trying to run my tests on TeamCity which is currently installed on my machine.

System.InvalidOperationException: System.InvalidOperationException:

The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' for the 'System.Data.SqlClient' ADO.NET provider could not be loaded. Make sure the provider assembly is available to the running application.

See http://go.microsoft.com/fwlink/?LinkId=260882 for more information..

I have no reference to System.Data.Entity in any of my projects as was suggested on codeplex for upgrading to EF6.

So, I am not sure why am I getting this exception. I do not get any such exception when I run the tests from VS.

I did try to set CopyLocal to false then again to true.. but that does not seem to work either.

Update

My app.config has the following . Does this cause some behavior that I don't understand ?

I get the following stacktrace in teamcity .

[MSTest] IntegrationTests.CrudTest+QuestionTest.Create  [03:59:11][IntegrationTests.CrudTest+QuestionTest.Create] Initialization method IntegrationTests.CrudTest+QuestionTest.Initialize threw exception. System.InvalidOperationException: System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' for the 'System.Data.SqlClient' ADO.NET provider could not be loaded. Make sure the provider assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information..  [03:59:11]  [IntegrationTests.CrudTest+QuestionTest.Create]     at System.Data.Entity.Config.ProviderServicesFactory.GetInstance(String providerTypeName, String providerInvariantName)     at System.Data.Entity.Config.ProviderServicesFactory.GetInstanceByConvention(String providerInvariantName)     at System.Data.Entity.Config.DefaultProviderServicesResolver.GetService(Type type, Object key)     at System.Data.Entity.Config.CachingDependencyResolver.<>c__DisplayClass1.b__0(Tuple`2 k)     at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)     at System.Data.Entity.Config.CachingDependencyResolver.GetService(Type type, Object key)     at System.Data.Entity.Config.ResolverChain.<>c__DisplayClass3.b__0(IDbDependencyResolver r)     at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()     at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)     at System.Data.Entity.Config.ResolverChain.GetService(Type type, Object key)     at System.Data.Entity.Config.RootDependencyResolver.GetService(Type type, Object key)     at System.Data.Entity.Config.ResolverChain.<>c__DisplayClass3.b__0(IDbDependencyResolver r)     at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()     at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)     at System.Data.Entity.Config.ResolverChain.GetService(Type type, Object key)     at System.Data.Entity.Config.CompositeResolver`2.GetService(Type type, Object key)     at System.Data.Entity.Config.IDbDependencyResolverExtensions.GetService[T](IDbDependencyResolver resolver, Object key)     at System.Data.Entity.Config.InternalConfiguration.GetService[TService](Object key)     at System.Data.Entity.Config.DbConfiguration.GetService[TService](Object key)     at System.Data.Entity.Utilities.DbProviderFactoryExtensions.GetProviderServices(DbProviderFactory factory)     at System.Data.Entity.Infrastructure.DefaultManifestTokenService.GetProviderManifestToken(DbConnection connection)     at System.Data.Entity.Utilities.DbConnectionExtensions.GetProviderInfo(DbConnection connection, DbProviderManifest& providerManifest)     at System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection)     at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)     at System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input)     at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()     at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)     at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()     at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()     at System.Data.Entity.Internal.Linq.InternalSet`1.ActOnSet(Action action, EntityState newState, Object entity, String methodName)     at System.Data.Entity.Internal.Linq.InternalSet`1.Add(Object entity)     at System.Data.Entity.DbSet`1.Add(TEntity entity)     at EFRepository.Infrastructure.EFRepository`1.Add(T item) in c:\TeamCity\buildAgent\work\da2ea4e72c0e77f0\Repository\Infrastructure\EFRepository.cs:line 22     at IntegrationTests.CrudTest.Initialize() in c:\TeamCity\buildAgent\work\da2ea4e72c0e77f0\IntegrationTests\CrudTest.cs:line 34  

Answer by ashutosh raina for Entity Framework Provider type could not be loaded?

I finally resolved this. Turns out, I had an erroneous implementation of IDIsposable in my repository class. I fixed that. The erroneous implementation caused a stackoverflow exception since I wasn't disposing off resources properly. This caused VS not to run the tests and the test execution engine crashed.

I filed it with Microsoft here ( this was before I got the correct solution). connect.microsoft.com/VisualStudio/feedback/details/775868/vs-test-execution-crashes-in-vs-2012#details

Anyway, the builds now run fine on teamcity. ALthough, I am still curious why neither VS Test execution engine had a graceful way of telling me what was happening not Team City.

I discovered the root cause by manually debugging the test ( which I only realised after so many days , the fix took me 5 seconds).

Hopefully this will help someone who comes across such issues.

Answer by Zapacila for Entity Framework Provider type could not be loaded?

Same problem, but i installed EF 6 through Nuget. EntityFramework.SqlServer was missing for another executable. I simply added the nuget package to that project.

Answer by Robert Muehsig for Entity Framework Provider type could not be loaded?

I had the same problem in my Test projects - I installed the latest EF6 bits via NuGet and everytime I invoke something EF-related I got: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' for the 'System.Data.SqlClient' ADO.NET provider could not be loaded. Make sure the provider assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.

My workaround: I placed this method inside my test project:

public void FixEfProviderServicesProblem()  {  //The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer'  //for the 'System.Data.SqlClient' ADO.NET provider could not be loaded.   //Make sure the provider assembly is available to the running application.   //See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.    var instance = System.Data.Entity.SqlServer.SqlProviderServices.Instance;  }  

This method is never been called, but I think the compiler will remove all "unnecessary" assemblies and without using the EntityFramework.SqlServer stuff the test fails.

Anyways: Works on my machine ;)

Answer by Nash for Entity Framework Provider type could not be loaded?

I've used Code-based registration for provider. link1 link2

Just created the configuration class like

class DbContextConfiguration : DbConfiguration  {      public DbContextConfiguration()      {          this.SetDatabaseInitializer(new DropCreateDatabaseAlways());          this.SetProviderServices(SqlProviderServices.ProviderInvariantName, SqlProviderServices.Instance);      }  }  

Key point is this.SetProviderServices(SqlProviderServices.ProviderInvariantName, SqlProviderServices.Instance);

and used it in the such way

[DbConfigurationType(typeof(DbContextConfiguration))]  public class MyDbContext : DbContext  {      public MyDbContext()      {          ...      }        public DbSet<...> ...{ get; set; }        protected override void OnModelCreating(DbModelBuilder modelBuilder)      {          ...      }  }  

Answer by odysseus.section9 for Entity Framework Provider type could not be loaded?

Nuget will configure your EF6 project to reference EntityFramework.SqlServer.dll. This deploys to the output folder for your EF6 project during build, but it will not deploy the output folder for projects referencing your EF6 project. I believe this is because the visual studio is "smart" enough to detect that nothing in your assembly is actually using the dll directly and so does not include it. You can force EntityFramework.SqlServer.dll to be deployed to the output folder of projects referencing your EF6 project (unit tests, UI's etc.) by adding code to your EF6 project that uses EntityFramework.SqlServer.dll. Be careful not to put the code in a generated class as you risk losing it on next regen. I chose to add the following class to the assembly, which fixed the problem.

using System.Data.Entity.SqlServer;    internal static class MissingDllHack  {      private static SqlProviderServices instance = SqlProviderServices.Instance;  }  

Answer by pastrami01 for Entity Framework Provider type could not be loaded?

I just had the same error message.

I have a separate project for my data access. Running the Web Project (which referenced the data project) locally worked just fine. But when I deployed the web project to azure the assembly: EntityFramework.SqlServer was not copied. I just added the reference to the web project and redeployed, now it works.

hope this helps others

Answer by Innovation Wang for Entity Framework Provider type could not be loaded?

I see similar problem, and using the method from this post: (http://entityframework.codeplex.com/workitem/1590), which solves my problem.

To work around the issue you can make your test assembly directly reference the provider assembly by adding some line like this anywhere in the test assembly: var _ = System.Data.Entity.SqlServer.SqlProviderServices.Instance;

Answer by Robert K for Entity Framework Provider type could not be loaded?

I was working on the Contoso University tutorial offline and encountered the same issue when trying to create my first controller using EF. I had to use the Package Manager Console to load EF from the nuget cache and created a connection string to my local instance of SQL Server, my point here is my webConfig setting for EF may not be set as you all out there but I was able to resolve my issue by completely deleting the "providers" section within "entityFramework"

Robert

Answer by Random for Entity Framework Provider type could not be loaded?

I sorted it out with [DeploymentItem] on my assembly initializing class

namespace MyTests  {      /// 
      /// Summary description for AssemblyTestInit      /// 
      [TestClass]      [DeploymentItem("EntityFramework.SqlServer.dll")]      public class AssemblyTestInit      {          public AssemblyTestInit()          {          }            private TestContext testContextInstance;            public TestContext TestContext          {              get              {                  return testContextInstance;              }              set              {                  testContextInstance = value;              }          }            [AssemblyInitialize()]          public static void DbContextInitialize(TestContext testContext)          {              Database.SetInitializer(new TestContextInitializer());          }      }  }  

Answer by ChinaHelloWorld for Entity Framework Provider type could not be loaded?

There is a easy fix. open the references in your project, right click "System.Data" -> properties. Change "Copy Local" to "True".

Problem should be fixed.

Answer by Thusitha Jayawickrama for Entity Framework Provider type could not be loaded?

When I inspected the problem, I have noticed that the following dll were missing in the output folder. The simple solution is copy Entityframework.dll and Entityframework.sqlserver.dll with the app.config to the output folder if the application is on debug mode. At the same time change, the build option parameter "Copy to output folder" of app.config to copy always. This will solve your problem.

Answer by Kevbo for Entity Framework Provider type could not be loaded?

My solution was to remove the entity framework from the project via the nuget manager and add it back in.

Answer by Matej for Entity Framework Provider type could not be loaded?

I have problem, because I don't add reference to EntityFramework.sqlServer.dll. When I develop program, it works. But when I publish app and install it, it throws error.

I just add reference and Build and Publish again.

Answer by Farrukh Najmi for Entity Framework Provider type could not be loaded?

In my case I resolved the problem by installing SQL Server 2012 Developer Edition when I had previously installed SQL Server Express 2012 (x64). It seems that provided me with the missing dependency.

Answer by Nish for Entity Framework Provider type could not be loaded?

Adding Entityframework.dll and Entityframework.sqlserver.dll to the reference project solved the issue.

Answer by Alex Gawkins for Entity Framework Provider type could not be loaded?

I checked Debug Output window in Unit Test project. EntityFramework.SqlServer.dll was not loaded. After adding it to the bin folder tests were run successfully.

Answer by mmttato for Entity Framework Provider type could not be loaded?

I solved this by adding an using stament on top of my DBContext class, like so:

using SqlProviderServices= System.Data.Entity.SqlServer.SqlProviderServices;  

Answer by Griffo for Entity Framework Provider type could not be loaded?

remove the entity framework from the project via nuget then add it back in.

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