Asp.Net identity does not create Database when using custom User - asp.net

Question

Im a little bit confused about UserManager.Create(...).
When I use the Standard EntityFramework's IdentityUser to create and add a new User everything works fine. EntityFramework creates a database if none exists with my connectionstring Data Source=(LocalDb)\MSSQLLocalDB;Database=IdentityDemo;trusted_connection=yes; and adds a User to the Database.
ExampleProgram:
static void Main(string[] args)
{
var username = "ygg";
var password = "Password123!";
var userStore = new UserStore<IdentityUser>();
var userManager = new UserManager<IdentityUser>(userStore);
var creationResult = userManager.Create(new IdentityUser(username), password);
}
But when i try to use my own CustomUser, EntityFramework does nothing and i get a NullReferenceException at UserManager.Create(...).
Here is my Extended CustomUser Project:
static void Main(string[] args)
{
var userName = "Ygg";
var password = "Password123!";
var userStore = new CustomUserStore(new CustomUserDbContext());
var userManager = new UserManager<CustomUser, int>(userStore);
var creationResult = userManager.Create(
new CustomUser {UserName = userName}, password); //<--- Exception Here
}
CustomUser-class:
public class CustomUser : IUser<int>
{
public int Id { get; set; }
public string UserName { get; set; }
public string PasswordHash { get; set; }
}
CustomUserDbContext:
public class CustomUserDbContext : IdentityDbContext
{
public CustomUserDbContext() : base("DefaultConnection")
{
}
public DbSet<CustomUser> Users { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
var user = modelBuilder.Entity<CustomUser>();
user.ToTable("Users");
user.HasKey(x => x.Id);
user.Property(x => x.Id).IsRequired().HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
user.Property(x => x.UserName).IsRequired().HasMaxLength(256)
.HasColumnAnnotation("Index", new IndexAnnotation(new IndexAttribute("UserNameIndex") { IsUnique = true }));
base.OnModelCreating(modelBuilder);
}
}
And last but not least, CustomUserStore:
public class CustomUserStore : IUserPasswordStore<CustomUser, int>
{
private readonly CustomUserDbContext _context;
public CustomUserStore(CustomUserDbContext context)
{
_context = context;
}
public void Dispose()
{
_context.Dispose();
}
public Task CreateAsync(CustomUser user)
{
_context.Users.Add(user);
return _context.SaveChangesAsync();
}
.
.
.
}
Exception:
object reference not set to an instance of an object
Stacktrace:
bei Microsoft.AspNet.Identity.UserManager2.<UpdatePassword>d__39.MoveNext()
bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
bei Microsoft.AspNet.Identity.UserManager2.d__d.MoveNext()
bei System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
bei Microsoft.AspNet.Identity.AsyncHelper.RunSync[TResult](Func1 func)
bei Microsoft.AspNet.Identity.UserManagerExtensions.Create[TUser,TKey](UserManager2 manager, TUser user, String password)
bei Identity.Program.Main(String[] args) in E:\syncplicity\z003apfp\Documents\Visual Studio 2015\Projects\Identity\Identity\Program.cs:Zeile 21.
bei System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
bei System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
I'm using EntityFramework 6.1.0 and AspNet.Identity.Core 2.2.1
Did i miss anything to configure, so AspNet.Identity and EntityFrameworks accepts my own implementations here?
Any help or thoughts where the problem lies, is appreciated.
I already tried to create the database first and then try to add a User using userManager.Create(new CustomUser {UserName = userName}, password), but this leads also to the same NullReferenceException

Answer 1

When you override something you should do it for the whole structure of Identity.
For example your DB Context should use something like this:
Custom Context
CustomUserDbContext : IdentityDbContext<CustomUser, CustomRole, int, CustomUserLogin, CustomUserRole, CustomUserClaim>
Custom User
User : IdentityUser<int, CustomUserLogin, CustomUserRole, CustomUserClaim>
Custom Role
CustomRole : IdentityRole<int, CustomUserRole> { }
Custom UserLogin
public class CustomUserLogin : IdentityUserLogin<int> { }
CustomUserClaim
public class CustomUserClaim : IdentityUserClaim<int> { }
Note that was an example yous should adapt according to your need.