A partial class for connecting to ASP.NET Core with full .NET framework from a Class Library using ADO.NET Entity Data Model

connection.cs

using System.Data.Common;
using System.Data.Entity.Core.EntityClient;

namespace DataAccessLayer.Models
{
    public partial class MyEntities
    {
        public MyEntities(string connString)            
            : base(GetSqlConnection(connString), true)
        {
        }

        public static DbConnection GetSqlConnection(string connString)
        {
            EntityConnectionStringBuilder entityBuilder = new EntityConnectionStringBuilder(connString);
            return new EntityConnection(entityBuilder.ToString());
        }
    }
}

startup.cs

public void ConfigureServices(IServiceCollection services)
{
    // Add framework services.
    services.AddMvc();

    services.AddScoped(p =>
    {
        return new MyEntities(Configuration["ConnectionStrings:MyEntities"]);
    });

    services.AddScoped<IDataModel, DataModelRepository>();
}