c#entity-frameworkmstestteamcity-7.1entity-framework-6

Reputation: 9314

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:

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 ?

<?xml version="1.0" encoding="utf-8"?>
<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>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
  </entityFramework>
</configuration>

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.<GetService>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.<GetService>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.<GetService>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

Upvotes: 455

Answers (30)

mdujava

Reputation: 327

I had a similar problem, because I didn't add reference to EntityFramework.sqlServer.dll. When I run program from vs, it worked. But when I publish app and install it, it throws error.

Rebuild after adding it into the reference fixed the problem.

References

Upvotes: 10

ashutosh raina

Reputation: 9314

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.

Upvotes: 4

Ulysses Alves

Reputation: 2469

After trying all other suggested solutions and don't getting my project to work, I finally found a little comment in this page:

Deleting the BIN-Folder did it for me

And it worked for me too.

Upvotes: 3

Siddhartha

Reputation: 1563

Click on Reference> check EntityFramework Reference is present or not

If not available Add it

Click on

Add Reference > Add entity framework 1)EntityFrameWork 2)EntityFrameWork.SqlServer

Upvotes: 0

hatsrumandcode

Reputation: 1871

I've created a static "startup" file and added the code to force the DLL to be copied to the bin folder in it as a way to separate this 'configuration'.

[DbConfigurationType(typeof(DbContextConfiguration))] public static class Startup { }



public class DbContextConfiguration : DbConfiguration
{
    public DbContextConfiguration()
    {
        // This is needed to force the EntityFramework.SqlServer DLL to be copied to the bin folder
        SetProviderServices(SqlProviderServices.ProviderInvariantName, SqlProviderServices.Instance);
    }
}

Upvotes: 4

Alishan

Reputation: 87

I had same isssue i tried many times but it did not resolve but when i install the package EntityFramework.SqlServerCompact it solved install this package from Nuget package Manager.

Install-Package EntityFramework.SqlServerCompact

Upvotes: 5

Code_Worm

Reputation: 4470

I had the same issue with Instantiating DBContext object from a unit test project. I checked my unit test project packages and I figured that EntityFramework package was not installed, I installed that from Nuget and problem solved (I think it's EF bug).

happy coding

Upvotes: 2

Kelvin

Reputation: 79

I had encountered exactly the same problem on my CI build server (running Bamboo), which doesn't install any Visual Studio IDE on it.

Without making any code changing for the build/test process (which I don't think is good solution), the best way is to copy the EntityFramework.SqlServer.dll and paste it to C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE. (where your mstest running)

Problem solved!

Upvotes: 0

BehrouzMoslem

Reputation: 9713

I also had a similar problem

My problem was solved by doing the following:

Upvotes: 2

Robert Muehsig

Reputation: 5326

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 ;)

Note: Instead of adding the method to test project you can ensure a static reference to SqlProviderServices from your Model/entity project.

Upvotes: 287

Timothy Schoonover

Reputation: 3265

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 to the output folder for projects referencing your EF6 project. I believe this is because 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
{
    // Must reference a type in EntityFramework.SqlServer.dll so that this dll will be
    // included in the output folder of referencing projects without requiring a direct 
    // dependency on Entity Framework. See http://stackoverflow.com/a/22315164/1141360.
    private static SqlProviderServices instance = SqlProviderServices.Instance;
}

Upvotes: 115

falopsy

Reputation: 636

Make sure EntityFramework.dll, EntityFramework.SqlServer.dll and your provider's dll (for SQL Server Compact, that will EntityFramework.SqlServerCompact.dll) are in the deployed application folder. This is especially important for deployed application.

Upvotes: 0

hal9000

Reputation: 852

This only happens inside my load/unit testing projects. Frustrating, I jyst had it crop up in a project I have been running for 2 years. Must have been some order of test running that breaks things. I guess once that fi gets removed its gone.

I found that simply declaring a variable that uses the correct value fixes the issue... I never even call the method. Just define it. Odd but it works.

    /// <summary>
    /// So that the test runner copies dlls not directly referenced by the integration project
    /// </summary>
    private void referenceLibs()
    {
        var useless = SqlProviderServices.Instance;
    }

Upvotes: 2

Blue Clouds

Reputation: 8161

The problem in my case was that in order to catch another exception I had enabled common language runtime (CLR) exceptions. And I forgot to disable it.

I disabled it in my exception setting. and it overlooked this exception and went on to run and create a db for me (in my case) automatically.

Upvotes: 0

jeriley

Reputation: 1333

Late to the party, but the top voted answers all seemed like hacks to me.

All I did was remove the following from my app.config in the test project. Worked.

  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="mssqllocaldb" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>

Upvotes: 11

patrickbadley

Reputation: 2590

I didn't want a reference to EF in my application project (or to manually copy anything) so I added this to my EF project's Post-build events:

cp $(TargetDir)EntityFramework.SqlServer.dll $(SolutionDir){your-main-bin-folder}

Upvotes: 2

yogihosting

Reputation: 6332

Simply reference or browser the EF dll - EntityFramework.SqlServer.dll

Upvotes: 3

Sreeja Sj

Reputation: 51

I have solved this by manually copying EntityFramework.SqlServer.dll file to the bin folder of the main application.

Upvotes: 5

Mauricio Atanache

Reputation: 2581

Additional to all useful suggestions here, if you are using EF 6.1.3, get sure your project's .net version is 4.5 or more.

Upvotes: 0

Baqer Naqvi

Reputation: 6514

In my case dll was not copied although I added a reference to it. This is because EntityFramework.SqlServer.dllis not copied into your project. Add that dll and it will hopefully work.You can find that from the project where you added datamodel.

Upvotes: 0

Griffo

Reputation: 103

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

Upvotes: 0

mmttato

Reputation: 593

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

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

Upvotes: 36

yW0K5o

Reputation: 943

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.

Upvotes: 1

Nish

Reputation: 171

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

Upvotes: 1

Farrukh Najmi

Reputation: 5316

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.

Upvotes: 0

Kevbo

Reputation: 943

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

Upvotes: 45

Thusitha Jayawickrama

Reputation: 31

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.

Upvotes: 3

ChinaHelloWorld

Reputation: 1047

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.

Upvotes: 0

Random

Reputation: 4779

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

namespace MyTests
{
    /// <summary>
    /// Summary description for AssemblyTestInit
    /// </summary>
    [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<TestContext>(new TestContextInitializer());
        }
    }
}

Upvotes: 15

Robert K

Reputation: 1

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

Upvotes: 0

Entity Framework Provider type could not be loaded?

Answers (30)

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