I am trying to follow the video tutorial on http://msdn.microsoft.com/en-us/data/jj193542 using Visual Studio 2012 Express for Desktop.
I created POCO's, and a DbContext, ran some sample queries and it worked. But I did not provide any connection string. So where is the database? (sdf or mdf file maybe?)
During the tutorial the guy uses SQL Server Object Explorer to view the database, but I couldn't find that view in VS Express.
For reference, here is the default App.config that gets generated.
<?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=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
</entityFramework>
</configuration>
"If SQL Express is installed (included in Visual Studio 2010) then the database is created on your local SQL Express instance (.\SQLEXPRESS). If SQL Express is not installed then Code First will try and use LocalDb ((localdb)\v11.0) - LocalDb is included with Visual Studio 2012"
For more information : http://msdn.microsoft.com/en-us/data/jj591621.aspx
#Default is correct, the default SQL server is (LocalDb)\mssqllocaldb in VS 2015 and 2017.
Related
I making simple EntityFramework with MVC application. My solution has 3 projects
GE.BLL
GE.Entities
GE.Web
Everything looked great until i decided to rename GE.BLL to GE.Core
so i removed the whole project and added all classes and references again from scratch to GE.Core. Now my EntityFramework for this project is installed and System.Data.Entity is also referenced but does not compile
"The type or namespace DbContext could not be found"
My app.config is
<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>
<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>
and packages.config is
<packages>
<package id="EntityFramework" version="6.1.3" targetFramework="net451" />
</packages>
i am using framework 4.5.1
So I uninstalled EntityFramework and re-installed it!
This happened to me when I was working with Microsoft.EntityFrameworkCore. The problem seemed to be that, when I initially created the project, I mistakenly put it within a .NET Core Web project. I had subsequently moved it up a level in the folder hierarchy outside of the web project. That is when I started seeing this error. Uninstalling and reinstalling the NuGet packages did not seem to work and Visual Studio's suggested fix was to reference dlls in the "nugetfallbackfolder" directory under Program Files.
Long story short, I ended up creating a brand new project and then everything worked just fine (after referencing the necessary Microsoft.EntityFrameworkCore NuGet packages, anyhow.
Hi I am trying to use EF6 with npsql under Asp.net 5. I am using a simple console (asp.net5) for testing and a separate class lib (.net 4.5) for the data access as a simple test enviroment. Have installed EF6 using
nuget EntityFramework6.Npgsql. Have also removed .net core dependencies from project.json file.
The problem i keep on getting the following error.
An exception of type 'System.NotSupportedException' occurred in EntityFramework.dll but was not handled in user code
Additional information: Unable to determine the provider name for provider factory of type 'Npgsql.NpgsqlFactory'. Make sure that the ADO.NET provider is installed or registered in the application config.
It seems to have trouble with the provider name for 'Npgsql.NpgsqlFactory'. But the provider name in the configuration is set. May be it needs to be set when it was compiled. Any ideas?
the app.config file is as follows
<?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>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<entityFramework>
<providers>
<provider invariantName="Npgsql.NpgsqlFactory" type="Npgsql.NpgsqlServices, Npgsql.EntityFramework"></provider>
</providers>
<defaultConnectionFactory type="Npgsql.NpgsqlConnectionFactory, Npgsql" />
</entityFramework>
<system.data>
<DbProviderFactories>
<remove invariant="Npgsql" />
<add name="Npgsql" invariant="Npgsql" description=".Net Framework Data Provider for Postgresql" type="Npgsql.NpgsqlFactory, Npgsql" />
</DbProviderFactories>
</system.data>
</configuration>
Any help will be much appreciated. Many thanks.
You are missing the complete assembly information for npgsql in your configuration. Please, check this answer for more information about it and the complete information:
https://stackoverflow.com/a/35440114/246097
I hope it helps.
I am using SQL Server CE 4.0 along with entity framework 6.0. Everythings work fine until I wanted to enable a N-Tier syncing mechanism with a remote database using a WCF service and the Sync Framework 2.1.
I followed this tutorial and use the JTune's workaround to overcome the issue that the SyncFramework 2.1 and SQLSErverCompactCE 4.0 compatibility is not supported. Which is simply a runtime binding redirect in app.config for System.Data.SqlServerCE.dll 4.0.0
Then I get the following App.config file
<?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>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlCeConnectionFactory, EntityFramework">
<parameters>
<parameter value="System.Data.SqlServerCe.4.0" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
<provider invariantName="System.Data.SqlServerCe.4.0" type="System.Data.Entity.SqlServerCompact.SqlCeProviderServices, EntityFramework.SqlServerCompact" />
</providers>
</entityFramework>
<connectionStrings>
<add name="Entities" connectionString="metadata=res://*/Persistence.Model1.csdl|res://*/Persistence.Model1.ssdl|res://*/Persistence.Model1.msl;provider=System.Data.SqlServerCe.4.0;provider connection string="data source=|DataDirectory|\XXXX.sdf"" providerName="System.Data.EntityClient" />
</connectionStrings>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Data.SqlServerCe" publicKeyToken="89845DCD8080CC91" culture="neutral"/>
<bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
<system.data>
<DbProviderFactories>
<remove invariant="System.Data.SqlServerCe.4.0" />
<add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
</DbProviderFactories>
</system.data>
</configuration>
It works fine on some configuration but may fail with the following error.
No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlServerCe.3.5'. 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.
Remark that the solution provided in this question is not viable, because in my situation, I really need the binding redirect to use SyncFramework.
Is there a way to tell entity framework not to look for a SQL Server CE 3.5 provider and only for the 4.0?
I think I got this. When SQL Server CE 3.5 is installed on the machine then its added to the DbProviders in the machine.config and depending on its position regarding the 4.0 version you may have the failure (see my comment above). It looks like the app.config lets you the possibility to remove a DbProviderFactory. I added the following line in my app.config and the problem seems to be resolved
<system.data>
<DbProviderFactories>
<remove invariant="System.Data.SqlServerCe.3.5" />
</DbProviderFactories>
</system.data>
I'm trying to get EF to work with Postgresql on a Linux platform. When I try to connect to the database I end up with this error: Failed to find or load the registered .Net Framework Data Provider 'Npgsql Data Provider'. My app.config file:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="entityFramework"
type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework" />
</configSections>
<system.data>
<DbProviderFactories>
<remove invariant="Npgsql"></remove>
<add name="Npgsql Data Provider"
invariant="Npgsql"
description=".Net Framework Data Provider for Postgresql Server"
type="Npgsql.NpgsqlFactory, Npgsql, Version=4.0.0.0, Culture=neutral" />
</DbProviderFactories>
</system.data>
<connectionStrings>
<add name="MinDatabase" connectionString="Server=localhost;Port=5432;Database=postgres;User Id=postgres;Password=;CommandTimeout=20;"
providerName="Npgsql Data Provider" />
</connectionStrings>
</configuration>
How can I make Mono load the data provider?
The error message contains the invariant name, so its looking for something with invariant name "Npgsql Data Provider" and you specifically set the invariantName to Npgsql. So maybe try to change to use the same name all over your configuration like this:
<system.data>
<DbProviderFactories>
<remove invariant="Npgsql"></remove>
<add name="Npgsql"
invariant="Npgsql"
description=".Net Framework Data Provider for Postgresql Server"
type="Npgsql.NpgsqlFactory, Npgsql, Version=4.0.0.0, Culture=neutral" />
</DbProviderFactories>
</system.data>
<connectionStrings>
<add name="MinDatabase" connectionString="Server=localhost;Port=5432;Database=postgres;User Id=postgres;Password=;CommandTimeout=20;"
providerName="Npgsql" />
</connectionStrings>
Hope it works
Where did you download Npgsql from? If you are using Npgsql from official releases, your problem is the Version attribute of the assembly. Npgsql which supports EF 4.x has version 2.0.14.3 and Npgsql which supports EF 6 has version 2.1.0. None has version 4.0.0.0.
For more info about using Npgsql with Entity Framework, check out:
How to integrate PostgreSql with EntityFramework 6.0.2?
Entity Framework 6 with Npgsql
http://fxjr.blogspot.com.br/2014/02/using-entity-framework-6-with-npgsql-210.html
I hope it helps.
Have a class library and a WPF application and am trying to contain all the Entity Framework items within the class library and use an interface to get the info out. Everything is setup but I get this message each time I try it out:
Message "The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception."
When I looked at the Inner Exceptions it appeared it couldn't find version 5.0.0.0 of EntityFramework and when I checked the Reference for it, it was 4.4.0.0. Tried uninstalling and reinstalling EntityFramework via NuGet but having no luck. Any ideas on what to try next?
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=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
</entityFramework>
</configuration>
I think this is a problem with your app.Config prehaps you dont have the following:
<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=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
</entityFramework>
This needs to be in the config file for your application entry point (whatever executable/webapp is running/using your class library)
A key detail to note is that EF4.4 is released inside the EF5 package and is used for non-.NET 4.5 applications (ie if you have .net 4.5 your reference will be 5.0 otherwise with .net 4 it will be 4.4)
Uninstalled EntityFramework
Updated Class Library to .Net Version 4.5
Reinstalled EntityFramework
Now all working.
I have tried changing the version of EF in the webconfig to the current installed version of the EF on the project and everything works smoothly.