setting Microsoft.AspNetCore.Identity default tables's ids to int

Question

I need to set all default Ids to int, but I only implemented a new user class. I am using Microsoft.AspNetCore.Identity and not Microsoft.AspNet.Identity

my user is :

public class User : IdentityUser
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

the DBAccessContext.cs is:

public class DBAccessContext : IdentityDbContext<User>
{
    public DBAccessContext(DbContextOptions<DBAccessContext> options) : base(options)
    {

    }

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

        // Customize the ASP.NET Identity model and override the defaults if needed.
        builder.Entity<User>(entity => { entity.ToTable(name: "Users");});
        builder.Entity<IdentityRole>(entity => { entity.ToTable(name: "Roles"); });
        builder.Entity<IdentityUserRole<string>>(entity => { entity.ToTable("Roles"); });
        builder.Entity<IdentityUserClaim<string>>(entity => { entity.ToTable("Claims"); });
        builder.Entity<IdentityUserLogin<string>>(entity => { entity.ToTable("Logins"); });
        builder.Entity<IdentityRoleClaim<string>>(entity => { entity.ToTable("RoleClaims"); });
        builder.Entity<IdentityUserToken<string>>(entity => { entity.ToTable("UserTokens"); });

        //Calling the Seeding
        builder.ApplyConfiguration(new RoleConfiguration());
    }
}

and finally the configuration is as follows:

    public static void ConfigureIdentity(this IServiceCollection services)
    {
        var builder = services.AddIdentityCore<User>(q => { q.User.RequireUniqueEmail = true; });
        builder = new IdentityBuilder(builder.UserType, typeof(IdentityRole), services);
        builder.AddEntityFrameworkStores<DBAccessContext>().AddDefaultTokenProviders();
    }

Answer 1

You can change your default Ids to int in this way.

User:

public class User : IdentityUser<int>
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

DBAccessContext :

public class DBAccessContext : IdentityDbContext<User, IdentityRole<int>, int>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }
    //....
}

If the database was created before the PK change, run Drop-Database drop the database and delete your Migrations folder

Then migration and update database.

About more details,you can see the doc:Change the primary key type.