Can't inherit from IdentityUser and IdentityRole in ASP.NET Core 2.0

Question

I\'m trying to finish updating to .NET Core 2.0 but a couple of errors pop up:

The problem:

I have two classes, ApplicationRole and ApplicationU

Answer 1

ICollection> Roles , ICollection> Claims and ICollection> Logins navigation properties have been removed from Microsoft.AspNetCore.Identity.IdentityUser .

You should define them manually

public class MyUser : IdentityUser
{                
    public virtual ICollection> Roles { get; } = new List>();

    public virtual ICollection> Claims { get; } = new List>();

    public virtual ICollection> Logins { get; } = new List>();
}

To prevent duplicate foreign keys when running EF Core Migrations, add the following to your IdentityDbContext class' OnModelCreating method

protected override void OnModelCreating(ModelBuilder builder)
{
  base.OnModelCreating(builder);

builder.Entity()
    .HasMany(e => e.Claims)
    .WithOne()
    .HasForeignKey(e => e.UserId)
    .IsRequired()
    .OnDelete(DeleteBehavior.Cascade);

builder.Entity()
    .HasMany(e => e.Logins)
    .WithOne()
    .HasForeignKey(e => e.UserId)
    .IsRequired()
    .OnDelete(DeleteBehavior.Cascade);

builder.Entity()
    .HasMany(e => e.Roles)
    .WithOne()
    .HasForeignKey(e => e.UserId)
    .IsRequired()
    .OnDelete(DeleteBehavior.Cascade);
}

Migrating Authentication and Identity to ASP.NET Core 2.0