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Entity Framework & VistaDb


I am new to VistaDb and I am trying to get a simple example of talking to a VistaDB database with EF.

I have created a clean Windows Forms App.

Using nugget, I added "Entity Framework" and then "VistaDb 5 Provider for Entity Framework 6 and later"

I then added a new item of "ADO.NET Entity Data Model", created a connection using the VistaDb driver, tested the connection and it worked...

Happy Days!

 I then proceeded to add some code to a button to get a list of visitors from my database as below..


Entities db = new Entities();
List<Visitor> visitors = db.Visitors.ToList();


But, when I run this code I get the error:

"An unhandled exception of type 'System.Configuration.ConfigurationErrorsException' occurred in System.Data.dll"

"Additional information: Failed to find or load the registered .Net Framework Data Provider."

Can anyone tell me what I am doing wrong please?

My app.config looks like this:


<?xml version="1.0" encoding="utf-8"?>
    <!-- For more information on Entity Framework configuration, visit -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    <provider invariantName="System.Data.VistaDB5" type="VistaDB.Entity.VistaDBProviderServices, VistaDB.5.Entity.6.NET40" /></providers>
      <remove invariant="System.Data.VistaDB5" />
      <add invariant="System.Data.VistaDB5" name="VistaDB 5 Data Provider" description="VistaDB 5 ADO.NET Provider for .Net 4" type="VistaDB.Provider.VistaDBProviderFactory, VistaDB.5.NET40" />
  </><connectionStrings><add name="Entities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=System.Data.VistaDB5;provider connection string='Data Source=&quot;C:\Users\Trevor\Documents\Visual Studio 2013\Projects\InventryDatastoreEF\InventryDB.vdb5&quot;;Password=nottellingyou!'" providerName="System.Data.EntityClient" /></connectionStrings></configuration>


1 Comment

Be sure you added a reference to the VistaDB engine (it should have added it) and that it's set to copy local.  Often the second part  is missing.  Rebuild and see if that address it.

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