Seed identity user table with changed id column? - asp.net-mvc-5

Question

I have changed the AspNetUser (identity) tabe to only user with the following code.
// Change the name of the table to be Users instead of AspNetUsers
modelBuilder.Entity<IdentityUser>()
.ToTable("Users").Property(p => p.Id).HasColumnName("UserID");
modelBuilder.Entity<ApplicationUser>()
.ToTable("Users").Property(p => p.Id).HasColumnName("UserID");
My application works fine but not my seed. I have this code in Migrations/Configuration.cs
var UserManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(context));
var RoleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(context));
string role = "Admin";
string password = "Password#1234";
//Create Role Admin if it does not exist
if (!RoleManager.RoleExists(role))
{
var roleresult = RoleManager.Create(new IdentityRole(role));
}
//Create Admin users with password=123456
var admin1 = new ApplicationUser();
admin1.UserName = "admin1#admin1.com";
admin1.Email = "admin1#admin1.com";
admin1.EmailConfirmed = true;
UserManager.Create(admin1, password);
UserManager.AddToRole(admin1.Id, role);
context.SaveChanges();
I get the error message "UserId not found". Seems like my UserManager.Create fails.
How can I change my seed code to use the UserID insted of standard Id?

Answer 1

Actually, when you save the user, it does not have an id given yet, you'll have to retrieve the user in between the creation of the user & addToRole:
var UserManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(context));
var RoleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(context));
string role = "Admin";
string password = "Password#1234";
//Create Role Admin if it does not exist
if (!RoleManager.RoleExists(role))
{
var roleresult = RoleManager.Create(new IdentityRole(role));
}
//Create Admin users with password=123456
var admin1 = new ApplicationUser();
admin1.UserName = "admin1#admin1.com";
admin1.Email = "admin1#admin1.com";
admin1.EmailConfirmed = true;
UserManager.Create(admin1, password);
// Refetch user with ID:
dbAdmin1 = context.Users.FirstOrDefault(x => x.UserName == admin1.UserName);
UserManager.AddToRole(dbAdmin1.Id, role);
context.SaveChanges();