InvalidOperationException when registering a new user with ASP .NET Core Identity and EntityFrameworkCore

Question

I\'m following the documentation for using Identity and am trying register a new user (executing the register action), but it fails with the following error:

Answer 1

I found the problem. My ApplicationContext was inheriting from DbContext. I changed it to IdentityDbContext<ApplicationUser> and it works.

Answer 2

Create new context class which inherit IdentityDbContext.

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);
        // Customize the ASP.NET Identity model and override the defaults if needed.
        // For example, you can rename the ASP.NET Identity table names and more.
        // Add your customizations after calling base.OnModelCreating(builder);
    }
}

and in startup.cs file add below code

services.AddDbContext<ApplicationDbContext>(options =>
            options.UseSqlServer(connection));

This will help you for database first approach.