Entity Framework ADO.NET Sql.Data.Client provider not found

Question

I have a similar problem as the one presented in the question No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'

Answer 1

If you get this error on Visual Studio while debugging, this happens after you installed another DB provider or IDE with DB Provider. I faced this error after I installed Delphi on my computer.

Solution: Just edit C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config and remove tags.

Answer 2

Wow...that is pretty special...Anyways. You need to register the Entity Framework provider for the System.Data.SqlClient SQL connection type.

You want to add the following to your app.config/web.config

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

Answer 3

Simply install "MySql.Data.Entity" from nuget! It will install mysql ado driver and entity driver automatically!

Answer 4

I got this error but for me it was something entirely different.

I had to edit:

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config

And:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config

Searching for DbProviderFactories both configs looked like this:

<system.data>
    <DbProviderFactories>
        <add name="IBM DB2 for i .NET Provider" invariant="IBM.Data.DB2.iSeries" description=".NET Framework Data Provider for IBM i" type="IBM.Data.DB2.iSeries.iDB2Factory, IBM.Data.DB2.iSeries, Version=12.0.0.0, Culture=neutral, PublicKeyToken=9cdb2ebfb1f93a26" />
    </DbProviderFactories>
    <DbProviderFactories />
</system.data>

When I removed the trailing <DbProviderFactories /> everything started working again.

I was able to solve it by looking at only Unable to find the requested .Net Framework Data Provider and finding this answer:

https://stackoverflow.com/a/9929534/3850405

Answer 5

Try adding

var _ = System.Data.Entity.SqlServer.SqlProviderServices.Instance;

in the ctor of your designContext.

Answer 6

Still not sure what was causing the problem, but ended up creating a new solution and copying everything from my project. Now works fine. Really weird, indeed.