I have a ASP.NET WebAPI 2 project that uses Ninject as IoC. I have a core layer that all my Class Library projects use, and that defines common interfaces.
I have a layer called Repositories where I put my applications repositories, and a layer called DataLayer that defines the different Entity Framework DbContext objects. My Repositories layer has a reference to my DataLayer, and on both the DataLayer and the Repositories Layer I've added EntityFramework.
All repositories classed inside repositories layers are implementing common interfaces from the core, and are injected to the contollers in the API using ninject. At first, when I ran my project and tried to do something against the repository, I got the following error message:
An exception of type 'System.InvalidOperationException' occurred in EntityFramework.dll but was not handled in user code
Additional information: No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'. Make sure the provider is registered in the 'entityFramework' section of the application config file. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.
What I did next is open the app.config file in the repository layer and copy the EntityFramework defenitions to my web.config in the API project:
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<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>
but now I get the following error:
An exception of type 'System.InvalidOperationException' occurred in mscorlib.dll but was not handled in user code
Additional information: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.
I don't think that the solution is including the entity framework in the API references because that would break the separation of concerns - the API shouldn't care what technology is used by the repository to access the data - so that if lets say in a month I would like to change my ORM or even my db, the API should not care what and how I use, as long as it uses the same interfaces.
What is the problem then? I'm new to EF, so I figure I must be missing something...
Your Web Config definitely got messed up somewhere. I would try to delete the .edmx and try to add a new one. This is what my config looks like, not sure if it'll help.
<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.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0" /> //did you change this here?
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
</configuration>
the API shouldn't care what technology is used by the repository to access the data
You have one application configuration file and one AppDomain. Both need the relevant Entity Framework configuration and assemblies to be loaded, because code in your DAL requires them.
The code of your web API shouldn't care, but the application configuration and hosting environment are separate from that.
Please try with installing the Entity framework again from Package Manager Console:
PM> Install-Package EntityFramework
This should solve your problem as the same issues was faced by me once.
Hope this works out.
Thanks
Related
Until recently, I used a MySQL database with Entity Framework. I have migrated this database to SQL Server.
For some reason however, Entity Framework still tries to use the MySQL provider for EF:
MetadataException: Schema specified is not valid.
Errors: (0,0) : error 0175: The ADO.NET provider with invariant name 'MySql.Data.MySqlClient' is either not registered in the machine or application config file, or could not be loaded. See the inner exception for details.
What I've tried so far:
I have removed every dependency and reference to MySQL and it's provider, including any NuGet packages
I've completely removed and re-installed Entity Framework
Obviously, I changed my connection string
I've even cleared all my app.config files (it's a WPF application) and reinstalled EF to start with a clean configuration
If I search my entire solution for MySQL, no results can be found. Still, this error occurs.
What could still cause this error?
My app.config (in case it matters):
<?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" />
</configSections>
<connectionStrings>
<add name="sqlservercon"
connectionString="Data Source=<url>;Initial Catalog=<dbname>;User Id=<user>;Password=<pw>;"
providerName="System.Data.SqlClient" />
</connectionStrings>
<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>
</configuration>
Context:
public class CustomContext : DbContext
{
public DbSet<Member> Members { get; set; }
...
public CustomContext()
: base("name=sqlservercon")
{
}
}
I have an n-layered application with data base activity performed in my data access layer. I have an application layer which asks my data access layer to perform tasks from the repositories in the data access layer. My user interface, which for now is a simple console app to test results, asks my application layer to get things like a list of data which in turn the application layer gets from the repository and it all gets back to the console app.
If I don't add the entity framework as a reference in my console app, I get the following error:
The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.
Why am I getting this error when the console app makes no data access calls or entity framework operations? All that is done in my data access layer which does have Entity Framework referenced.
Update:
Below is my console interface:
class MyServices
{
IProductRequestServices _ProductRequestServices;
public MyServices(IProductRequestServices _ProductRequestServices)
{
this._ProductRequestServices = _ProductRequestServices;
}
public void ProductList()
{
List<ProductRequestDetailDto> aList = _ProductRequestServices.GetProductRequestExtendedDetailAll();
foreach (ProductRequestDetailDto prodReq in aList)
{
System.Console.WriteLine("Product Req ID: {0} - Product Name: {1}",
prodReq.productRequestId.ToString(), prodReq.productName);
}
}
public void ClientList()
{
List<ProductRequestDetailDto> aList = _ProductRequestServices.GetProductRequestExtendedDetailAll();
foreach (ProductRequestDetailDto prodReq in aList)
{
System.Console.WriteLine("Product Req ID: {0} - Product Name: {1}",
prodReq.productRequestId.ToString(), prodReq.firstName + " " + prodReq.lastName);
}
}
}
class Program
{
static void Main(string[] args)
{
ProductRequestServices _ProductRequestServices = new ProductRequestServices();
MyServices MyServices = new MyServices(_ProductRequestServices);
MyServices.ProductList();
System.Console.WriteLine("============================");
MyServices.ClientList();
System.Console.ReadLine();
}
}
Below is the App.config.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<connectionStrings>
<add name="MDISContext" connectionString="metadata=res://*/ModelEntities.csdl|res://*/ModelEntities.ssdl|res://*/ModelEntities.msl;provider=System.Data.SqlClient;provider connection string="data source=WIN-2012-SRVR-3;initial catalog=MDIS;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
</connectionStrings>
<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>
</configuration>
If I just remove the entityFramework sections and database strings I get the following error:
{"Schema specified is not valid. Errors: \r\nModelEntities.ssdl(2,2) : error 0152: No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'. Make sure the provider is registered in the 'entityFramework' section of the application config file. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information."}
Then if I remove the configuration section which does an entityframework registstration I get the same error.
All these errors go away if I add EntityFramework to the consoled project of my solution which also adds these entries into the app.config
The repository layer is going to look for the EF config in the configuration file loaded for the running app domain. So yes, your console app needs the configuration and that requires EF references. If your repositories were in an external service or another process then you would not need EF references.
only data/ repository layer should know the Db related dlls/ logics, but I faced same issue with entity framework.
MSBuild was not copying this EF SQL dll in bin/debug folder. I had to include this dll in my UI project.
Reason, if I remember it correctly, is because of some intelligent stuff MSBuild was trying to do, which is: If its not able to find a reference in some kind of dependency tree, it will not include it in output or bin/debug folder. (i don't remember the source of this)
I have a WinForms project that uses EntityFramework 6.1.2-beta with .NET4, it worked fine, till I decided to replace EF assemblies with their source codes, for some tracing goals, so I removed EntityFramework.dll and EntityFramework.SqlServer.dll from my project references and get their source codes from CodePlex and add them to my solution.
I changed these new project configuration to DebugNet40(because my project works with .NET 4, but EntityFramework and EntityFramework.SqlServer projects work with .NET 4.5).
It compile successfully, but now when I want to run my project I get following error:
An unhandled exception of type 'System.IO.FileLoadException' occurred in Microsoft.VisualStudio.HostingProcess.Utilities.dll
Additional information: Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. Strong name validation failed. (Exception from HRESULT: 0x8013141A)
It is my app.config file:
<?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" />
</configSections>
<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>
<connectionStrings>
<add name="ERPContext"
connectionString="Data Source=.;Initial Catalog=MyDb;
Persist Security Info=True;User ID=sa;password=*****"
providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>
I removed PublicKeyToken=b77a5c561934e089" from app.config too, but the problem exists yet.
Is there any Idea?
The Entity Framework source code is configured to produce delay-signed assemblies (which means they're marked as "should be signed in the future with the official key"). The official instructions at Entity Framework's GitHub page show how to disable strong name validation (run the EnableSkipStrongNames task: build /t:EnableSkipStrongNames), so that you can use the delay-signed assemblies without anyone having to release their private key. This is sufficient for development systems.
If you intend to release a product relying on your custom-built modified Entity Framework DLLs, you should generate a new key, and modify the EF source code to use that new key.
You can right click the project in Visual Studio solution explorer, and Signing on the left and uncheck sign assembly. In your web config you will also need to remove the public key token.
I am trying to deploy an MVC app to an EC2 instance using Web Deploy, and everything is working until I try to run the application. I get the following error:
Parser Error Message: An error occurred creating the configuration section handler for entityFramework: Configuration for DbContext type 'Project.Modules.AppDbContext, Project' is specified multiple times in the application configuration. Each context can only be configured once.
I have looked all of the related issues I could find (error There is a duplicate 'entityFramework' section defined, There is a duplicate 'entityFramework' section defined - EntityFramework6 upgrade, The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception, The provider for invariant name System.Data.SqlClient is specified multiple times). It is an MVC app so there are multiple Web.config files, but the EF section it is complaining about doesn't exist in both places. Here are the relevant portions of my config file:
<configSections>
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
--------more config settings here---------
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework">
<parameters>
<parameter value="Data Source=MYIP;Initial Catalog=db;Persist Security Info=True;User ID=user;Password=password" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
I have heard anything from it should be resolved in 6.1.0 to many other things. If I remove the entry from the configSection it gives me another error about how it can't find the right resources. The only other thing that might be worth noting is that if I deploy and un-check 'Execute Code First Migrations' it just times out instead of giving me the above error.
Check web.config in root or parent folders of your app's virtual directory. The duplicate section error happens due to web.config inheritance.
wwwroot
|-- web.config <-- ensure this doesn't have any connection strings
|-- your app
|-- web.config <-- inherites wwwroot\web.config's settings
As vcsjones states in their answer here
The Problem is in your parent directory.Even if you specified one,there is already one in .config file.
I'm following this tutorial to create a Code-First Database.
After installing EF and creating those first basic classes it says:
Run your application and you will see that a
MigrationsCodeDemo.BlogContext database is created for you.
Well, I have VS2013 Pro with all the SQL Servers installed (full installation of VS2013 Pro).
Now as you can see from the image below, I can't find my database after running the program as the tutorial is suggesting. When I try to do the migrations part of the tutorial, I indeed get the error it supposed to get, implying that somewhere the database actually has been created. I just am not able to find it.
Where is it located?
Edit: added App.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<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>
</configuration>
The physical master database files are at
C:\Users\<user>\AppData\Local\Microsoft\Microsoft SQL Server Local DB\Instances\v11.0
The DB files are simply in C:\Users\<user>
You can also connect to localdb using SSMS by using server (localdb)\v11.0 and delete the database from there.
The official documentation is here
http://msdn.microsoft.com/en-AU/library/hh510202.aspx
Edit by QuantumHive:
I finally figured out that the Database can be found in the instance called MSSqlLocalDb which Entity Framework added by default in my App.config. I now have a visualization of the database in Visual Studio:
I'm guessing those tutorials are old and referring to the v11.0 instance, which perhaps and older version of EF added that by default at the time.
You are connected to localDb\Projects instance and not to localDb\v11.0, the only thing you need to do is clicking 'Add Sql Server' and paste '(localDb)\v11.0' into Server name, then connect and you are done.