<?xml version="1.0" encoding="utf-8"?>
<!--
  Дополнительные сведения о настройке приложения ASP.NET см. по адресу:
  http://go.microsoft.com/fwlink/?LinkId=301879
  -->
<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="Npgsql.NpgsqlServices, Npgsql.EntityFramework" />
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <provider invariantName="Npgsql" type="Npgsql.NpgsqlServices, Npgsql.EntityFramework" />
    </providers>
  </entityFramework>

  <system.data>
    <DbProviderFactories>
      <add name="Npgsql Data Provider" invariant="Npgsql"
        support="FF" description=".Net Framework Data Provider for Postgresql"
        type="Npgsql.NpgsqlFactory, Npgsql" />
    </DbProviderFactories>
  </system.data>

  <connectionStrings>
    <add name="SkvagContext" providerName="Npgsql"
         connectionString="Server=127.0.0.1;User Id=portal;Password=1;Port=5432;Database=xxxx;" />
  </connectionStrings>
  
</configuration>

[InvalidCastException: Не удалось привести тип объекта "Npgsql.NpgsqlServices" к типу "System.Data.Entity.Infrastructure.IDbConnectionFactory".]
   System.Data.Entity.Internal.AppConfig.<.ctor>b__3() +89

[InvalidOperationException: Failed to set Database.DefaultConnectionFactory to an instance of the 'Npgsql.NpgsqlServices, Npgsql.EntityFramework' type as specified in the application configuration. See inner exception for details.]
   System.Data.Entity.Internal.AppConfig.<.ctor>b__3() +142
   System.Lazy`1.CreateValue() +411
   System.Lazy`1.LazyInitValue() +183
   System.Lazy`1.get_Value() +75
   System.Data.Entity.Internal.AppConfig.TryGetDefaultConnectionFactory() +26
......................................