How to access users when Identity project uses EF Core and Class Library uses EF6 with same database

I was able to get this to work. The main issue is that I just wanted to access my AspNetUsers table that was generated by Identity 3 in the DotNet Core project in my DotNet 4.51 DataLayer class library project.

I achieved this by creating a User.cs Entity class in the class library EF 6 project and making sure it's properties matched the columns from the Identity 3 generated ApplicationUser.cs class.

User.cs

     public class User{

    [Key]
    public string Id { get; set; }
    public int AccessFailedCount { get; set; }
    public string ConcurrencyStamp { get; set; }
    public string Email { get; set; }
    public bool EmailConfirmed { get; set; }
    public bool LockoutEnabled { get; set; }
    public DateTimeOffset? LockoutEnd { get; set; }
    public string NormalizedEmail { get; set; }
    public string NormalizedUserName { get; set; }
    public virtual string PasswordHash { get; set; }
    public string PhoneNumber { get; set; }
    public bool PhoneNumberConfirmed { get; set; }
    public virtual string SecurityStamp { get; set; }
    public bool TwoFactorEnabled { get; set; }
    public string UserName { get; set; }
}

I then set up an EntityConfiguration to map to the AspNetUsers table

UserConfiguration.cs

public class UserConfiguration : EntityTypeConfiguration<User>
{
    public UserConfiguration()
    {
        ToTable("AspNetUsers");
    }
}

In my DbContext class I added a DbSet for my Users entity:

public virtual IDbSet<User> Users { get; set; }

I then ran the Add-Migration command to scaffold the changes. Once generated, I commented out the code and applied the migration to the database. This generates a row in the __MigrationsHistory table for the AspNetUsers table but doesn't try to recreate the table.

I was then able to successfully talk to the AspNetUsers table from the DataLayer EF6 project :)

Also it seems that I can also extend the AspNetUsers table with custom columns now by adding properties to my User.cs class and doing the migrations in the EF6 Datalayer project.